Showing 1–28 of 28 results for author: Osmanov, B

Significant Excess of ElectronLike Events in the MiniBooNE Short-Baseline Neutrino Experiment

Authors: MiniBooNE Collaboration, A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, J. M. Conrad, R. L. Cooper, R. Dharmapalan, A. Diaz, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, E. -C. Huang, W. Huelsnitz, C. Ignarra, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh , et al. (23 additional authors not shown)

Abstract: The MiniBooNE experiment at Fermilab reports results from an analysis of $ν_e$ appearance data from $12.84 \times 10^{20}$ protons on target in neutrino mode, an increase of approximately a factor of two over previously reported results. A $ν_e$ charged-current quasielastic event excess of $381.2 \pm 85.2$ events ($4.5 σ$) is observed in the energy range $200<E_ν^{QE}<1250$~MeV. Combining these da… ▽ More The MiniBooNE experiment at Fermilab reports results from an analysis of $ν_e$ appearance data from $12.84 \times 10^{20}$ protons on target in neutrino mode, an increase of approximately a factor of two over previously reported results. A $ν_e$ charged-current quasielastic event excess of $381.2 \pm 85.2$ events ($4.5 σ$) is observed in the energy range $200<E_ν^{QE}<1250$~MeV. Combining these data with the $\bar ν_e$ appearance data from $11.27 \times 10^{20}$ protons on target in antineutrino mode, a total $ν_e$ plus $\bar ν_e$ charged-current quasielastic event excess of $460.5 \pm 99.0$ events ($4.7 σ$) is observed. If interpreted in a two-neutrino oscillation model, $ν_μ \rightarrow ν_e$, the best oscillation fit to the excess has a probability of $21.1\%$, while the background-only fit has a $χ^2$ probability of $6 \times 10^{-7}$ relative to the best fit. The MiniBooNE data are consistent in energy and magnitude with the excess of events reported by the Liquid Scintillator Neutrino Detector (LSND), and the significance of the combined LSND and MiniBooNE excesses is $6.0 σ$. A two-neutrino oscillation interpretation of the data would require at least four neutrino types and indicate physics beyond the three neutrino paradigm.Although the data are fit with a two-neutrino oscillation model, other models may provide better fits to the data. △ Less

Submitted 26 October, 2018; v1 submitted 30 May, 2018; originally announced May 2018.

Comments: Improved some of the figures and improved the correlation between neutrino and antineutrino data

Report number: LA-UR-18-24586

Journal ref: Phys. Rev. Lett. 121, 221801 (2018)

First Measurement of Monoenergetic Muon Neutrino Charged Current Interactions

Authors: A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. L. Cooper, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. S. Fitzpatrick, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, J. R. Jordan, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, K. Mahn , et al. (24 additional authors not shown)

Abstract: We report the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE has isolated 236 MeV muon neutrino events originating from charged kaon decay at rest ($K^+ \rightarrow μ^+ ν_μ$) at the NuMI beamline absorber. These signal $ν_μ$-carbon events are distinguished from primarily pion decay in flight $ν_μ$ and $\overlineν_μ$ backgrounds produced at the target stati… ▽ More We report the first measurement of monoenergetic muon neutrino charged current interactions. MiniBooNE has isolated 236 MeV muon neutrino events originating from charged kaon decay at rest ($K^+ \rightarrow μ^+ ν_μ$) at the NuMI beamline absorber. These signal $ν_μ$-carbon events are distinguished from primarily pion decay in flight $ν_μ$ and $\overlineν_μ$ backgrounds produced at the target station and decay pipe using their arrival time and reconstructed muon energy. The significance of the signal observation is at the 3.9$σ$ level. The muon kinetic energy, neutrino-nucleus energy transfer ($ω=E_ν-E_μ$), and total cross section for these events is extracted. This result is the first known-energy, weak-interaction-only probe of the nucleus to yield a measurement of $ω$ using neutrinos, a quantity thus far only accessible through electron scattering. △ Less

Submitted 7 May, 2018; v1 submitted 11 January, 2018; originally announced January 2018.

Comments: 6 pages, 4 figures

Journal ref: Phys. Rev. Lett. 120, 141802 (2018)

MINERvA neutrino detector response measured with test beam data

Authors: MINERvA Collaboration, L. Aliaga, O. Altinok, C. Araujo Del Castillo, L. Bagby, L. Bellantoni, W. F. Bergan, A. Bodek, R. Bradford, A. Bravar, H. Budd, A. Butkevich, D. A. Martinez Caicedo, M. F. Carneiro, M. E. Christy, J. Chvojka, H. da Motta, J. Devan, G. A. Diaz, S. A. Dytman, B. Eberly, J. Felix, L. Fields, R. Fine, R. Flight , et al. (63 additional authors not shown)

Abstract: The MINERvA collaboration operated a scaled-down replica of the solid scintillator tracking and sampling calorimeter regions of the MINERvA detector in a hadron test beam at the Fermilab Test Beam Facility. This article reports measurements with samples of protons, pions, and electrons from 0.35 to 2.0 GeV/c momentum. The calorimetric response to protons, pions, and electrons are obtained from the… ▽ More The MINERvA collaboration operated a scaled-down replica of the solid scintillator tracking and sampling calorimeter regions of the MINERvA detector in a hadron test beam at the Fermilab Test Beam Facility. This article reports measurements with samples of protons, pions, and electrons from 0.35 to 2.0 GeV/c momentum. The calorimetric response to protons, pions, and electrons are obtained from these data. A measurement of the parameter in Birks' law and an estimate of the tracking efficiency are extracted from the proton sample. Overall the data are well described by a Geant4-based Monte Carlo simulation of the detector and particle interactions with agreements better than 4%, though some features of the data are not precisely modeled. These measurements are used to tune the MINERvA detector simulation and evaluate systematic uncertainties in support of the MINERvA neutrino cross section measurement program. △ Less

Submitted 7 April, 2015; v1 submitted 26 January, 2015; originally announced January 2015.

Comments: as accepted by NIM A

Report number: FERMILAB-PUB-15-018-ND

Using L/E Oscillation Probability Distributions

Authors: A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills, J. Mirabal , et al. (19 additional authors not shown)

Abstract: This paper explores the use of $L/E$ oscillation probability distributions to compare experimental measurements and to evaluate oscillation models. In this case, $L$ is the distance of neutrino travel and $E$ is a measure of the interacting neutrino's energy. While comparisons using allowed and excluded regions for oscillation model parameters are likely the only rigorous method for these comparis… ▽ More This paper explores the use of $L/E$ oscillation probability distributions to compare experimental measurements and to evaluate oscillation models. In this case, $L$ is the distance of neutrino travel and $E$ is a measure of the interacting neutrino's energy. While comparisons using allowed and excluded regions for oscillation model parameters are likely the only rigorous method for these comparisons, the $L/E$ distributions are shown to give qualitative information on the agreement of an experiment's data with a simple two-neutrino oscillation model. In more detail, this paper also outlines how the $L/E$ distributions can be best calculated and used for model comparisons. Specifically, the paper presents the $L/E$ data points for the final MiniBooNE data samples and, in the Appendix, explains and corrects the mistaken analysis published by the ICARUS collaboration. △ Less

Submitted 11 July, 2014; originally announced July 2014.

A new investigation of electron neutrino appearance oscillations with improved sensitivity in the MiniBooNE+ experiment

Authors: R. Dharmapalan, S. Habib, C. Jiang, I. Stancu, Z. Djurcic, R. A. Johnson, A. Wickremasinghe, G. Karagiorgi, M. H. Shaevitz, B. C. Brown, F. G. Garcia, R. Ford, W. Marsh, C. D. Moore, D. Perevalov, C. C. Polly, J. Grange, J. Mousseau, B. Osmanov, H. Ray, R. Cooper, R. Tayloe, R. Thornton, G. T. Garvey, W. Huelsnitz , et al. (12 additional authors not shown)

Abstract: We propose the addition of scintillator to the existing MiniBooNE detector to allow a test of the neutral-current/charged-current (NC/CC) nature of the MiniBooNE low-energy excess. Scintillator will enable the reconstruction of 2.2 MeV $γ$s from neutron-capture on protons following neutrino interactions. Low-energy CC interactions where the oscillation excess is observed should have associated neu… ▽ More We propose the addition of scintillator to the existing MiniBooNE detector to allow a test of the neutral-current/charged-current (NC/CC) nature of the MiniBooNE low-energy excess. Scintillator will enable the reconstruction of 2.2 MeV $γ$s from neutron-capture on protons following neutrino interactions. Low-energy CC interactions where the oscillation excess is observed should have associated neutrons with less than a 10% probability. This is in contrast to the NC backgrounds that should have associated neutrons in approximately 50% of events. We will measure these neutron fractions with $ν_μ$ CC and NC events to eliminate that systematic uncertainty. This neutron-fraction measurement requires $6.5\times10^{20}$ protons on target delivered to MiniBooNE with scintillator added in order to increase the significance of an oscillation excess to over $5σ$. This new phase of MiniBooNE will also enable additional important studies such as the spin structure of nucleon ($Δs$) via NC elastic scattering, a low-energy measurement of the neutrino flux via $\numu ^{12}C \rightarrow μ^{-} ^{12}N_\textrm{g.s.}$ scattering, and a test of the quasielastic assumption in neutrino energy reconstruction. These topics will yield important, highly-cited results over the next 5 years for a modest cost, and will help to train Ph.D. students and postdocs. This enterprise offers complementary information to that from the upcoming liquid Argon based MicroBooNE experiment. In addition, MicroBooNE is scheduled to receive neutrinos in early 2014, and there is minimal additional cost to also deliver beam to MiniBooNE. △ Less

Submitted 2 October, 2013; v1 submitted 30 September, 2013; originally announced October 2013.

Comments: Submitted as whitepaper for Snowmass'13 proceedings - 8 pages, 3 figures; version 2: Minor change to title and author list

Measurement of the Antineutrino Neutral-Current Elastic Differential Cross Section

Authors: A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills, J. Mirabal , et al. (20 additional authors not shown)

Abstract: We report the measurement of the flux-averaged antineutrino neutral current elastic scattering cross section ($dσ_{\bar νN \rightarrow \bar νN}/dQ^{2}$) on CH$_{2}$ by the MiniBooNE experiment using the largest sample of antineutrino neutral current elastic candidate events ever collected. The ratio of the antineutrino to neutrino neutral current elastic scattering cross sections and a ratio of an… ▽ More We report the measurement of the flux-averaged antineutrino neutral current elastic scattering cross section ($dσ_{\bar νN \rightarrow \bar νN}/dQ^{2}$) on CH$_{2}$ by the MiniBooNE experiment using the largest sample of antineutrino neutral current elastic candidate events ever collected. The ratio of the antineutrino to neutrino neutral current elastic scattering cross sections and a ratio of antineutrino neutral current elastic to antineutrino charged current quasi elastic cross section is also presented. △ Less

Submitted 27 September, 2013; originally announced September 2013.

Report number: FERMILAB-PUB-13-426-E-PPD

Journal ref: Phys. Rev. D 91, 012004 (2015)

The OscSNS White Paper

Authors: OscSNS Collaboration, R. Allen, F. T. Avignone, J. Boissevain, Y. Efremenko, M. Elnimr, T. Gabriel, F. G. Garcia, G. T. Garvey, T. Handler, W. Huelsnitz, R. Imlay, Y. Kamyshkov, J. M. Link, W. C. Louis, G. B. Mills, S. R. Mishra, B. Osmanov, Z. Pavlovic, H. Ray, B. P. Roe, C. Rosenfeld, I. Stancu, R. Svoboda, R. Tayloe , et al. (4 additional authors not shown)

Abstract: There exists a need to address and resolve the growing evidence for short-baseline neutrino oscillations and the possible existence of sterile neutrinos. Such non-standard particles require a mass of $\sim 1$ eV/c$^2$, far above the mass scale associated with active neutrinos, and were first invoked to explain the LSND $\bar ν_μ\rightarrow \bar ν_e$ appearance signal. More recently, the MiniBooNE… ▽ More There exists a need to address and resolve the growing evidence for short-baseline neutrino oscillations and the possible existence of sterile neutrinos. Such non-standard particles require a mass of $\sim 1$ eV/c$^2$, far above the mass scale associated with active neutrinos, and were first invoked to explain the LSND $\bar ν_μ\rightarrow \bar ν_e$ appearance signal. More recently, the MiniBooNE experiment has reported a $2.8 σ$ excess of events in antineutrino mode consistent with neutrino oscillations and with the LSND antineutrino appearance signal. MiniBooNE also observed a $3.4 σ$ excess of events in their neutrino mode data. Lower than expected neutrino-induced event rates using calibrated radioactive sources and nuclear reactors can also be explained by the existence of sterile neutrinos. Fits to the world's neutrino and antineutrino data are consistent with sterile neutrinos at this $\sim 1$ eV/c$^2$ mass scale, although there is some tension between measurements from disappearance and appearance experiments. In addition to resolving this potential major extension of the Standard Model, the existence of sterile neutrinos will impact design and planning for all future neutrino experiments. It should be an extremely high priority to conclusively establish if such unexpected light sterile neutrinos exist. The Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, built to usher in a new era in neutron research, provides a unique opportunity for US science to perform a definitive world-class search for sterile neutrinos. △ Less

Submitted 7 October, 2013; v1 submitted 26 July, 2013; originally announced July 2013.

Comments: This white paper is submitted as part of the SNOWMASS planning process

Design, Calibration, and Performance of the MINERvA Detector

Authors: L. Aliaga, L. Bagby, B. Baldin, A. Baumbaugh, A. Bodek, R. Bradford, W. K. Brooks, D. Boehnlein, S. Boyd, H. Budd, A. Butkevich, D. A. Martinez Caicedo, C. M. Castromonte, M. E. Christy, J. Chvojka, H. da Motta, D. S. Damiani, I. Danko, M. Datta, R. DeMaat, J. Devan, E. Draeger, S. A. Dytman, G. A. Diaz, B. Eberly , et al. (80 additional authors not shown)

Abstract: The MINERvA experiment is designed to perform precision studies of neutrino-nucleus scattering using $ν_μ$ and ${\barν}_μ$ neutrinos incident at 1-20 GeV in the NuMI beam at Fermilab. This article presents a detailed description of the \minerva detector and describes the {\em ex situ} and {\em in situ} techniques employed to characterize the detector and monitor its performance. The detector is co… ▽ More The MINERvA experiment is designed to perform precision studies of neutrino-nucleus scattering using $ν_μ$ and ${\barν}_μ$ neutrinos incident at 1-20 GeV in the NuMI beam at Fermilab. This article presents a detailed description of the \minerva detector and describes the {\em ex situ} and {\em in situ} techniques employed to characterize the detector and monitor its performance. The detector is comprised of a finely-segmented scintillator-based inner tracking region surrounded by electromagnetic and hadronic sampling calorimetry. The upstream portion of the detector includes planes of graphite, iron and lead interleaved between tracking planes to facilitate the study of nuclear effects in neutrino interactions. Observations concerning the detector response over sustained periods of running are reported. The detector design and methods of operation have relevance to future neutrino experiments in which segmented scintillator tracking is utilized. △ Less

Submitted 22 May, 2013; originally announced May 2013.

Report number: FERMILAB-PUB-13-111-E

Journal ref: Nucl. Inst. and Meth. A743 (2014) 130

Measurement of Muon Neutrino Quasi-Elastic Scattering on a Hydrocarbon Target at E_ν ~ 3.5 GeV

Authors: The MINERvA collaboration, G. A. Fiorentini, D. W. Schmitz, P. A. Rodrigues, L. Aliaga, O. Altinok, B. Baldin, A. Baumbaugh, A. Bodek, D. Boehnlein, S. Boyd, R. Bradford, W. K. Brooks, H. Budd, A. Butkevich, D. A. Martinez Caicedo, C. M. Castromonte, M. E. Christy, H. Chung, J. Chvojka, M. Clark, H. da Motta, D. S. Damiani, I. Danko, M. Datta , et al. (93 additional authors not shown)

Abstract: We report a study of muon neutrino charged-current quasi-elastic events in the segmented scintillator inner tracker of the MINERvA experiment running in the NuMI neutrino beam at Fermilab. The events were selected by requiring a μ^- and low calorimetric recoil energy separated from the interaction vertex. We measure the flux-averaged differential cross-section, dσ/dQ^2, and study the low energy pa… ▽ More We report a study of muon neutrino charged-current quasi-elastic events in the segmented scintillator inner tracker of the MINERvA experiment running in the NuMI neutrino beam at Fermilab. The events were selected by requiring a μ^- and low calorimetric recoil energy separated from the interaction vertex. We measure the flux-averaged differential cross-section, dσ/dQ^2, and study the low energy particle content of the final state. Deviations are found between the measured dσ/dQ^2 and the expectations of a model of independent nucleons in a relativistic Fermi gas. We also observe an excess of energy near the vertex consistent with multiple protons in the final state. △ Less

Submitted 30 March, 2014; v1 submitted 9 May, 2013; originally announced May 2013.

Comments: 7 pages, 5 figures. Added correlation between neutrino and anti-neutrino result in ancillary files (CSV)

Report number: FERMILAB-PUB-13-146-E

Journal ref: Phys. Rev. Lett. 111, 022502 (2013)

Measurement of Muon Antineutrino Quasi-Elastic Scattering on a Hydrocarbon Target at E_ν ~ 3.5 GeV

Authors: The MINERvA collaboration, L. Fields, J. Chvojka, L. Aliaga, O. Altinok, B. Baldin, A. Baumbaugh, A. Bodek, D. Boehnlein, S. Boyd, R. Bradford, W. K. Brooks, H. Budd, A. Butkevich, D. A. Martinez Caicedo, C. M. Castromonte, M. E. Christy, H. Chung, M. Clark, H. da Motta, D. S. Damiani, I. Danko, M. Datta, M. Day, R. DeMaat , et al. (93 additional authors not shown)

Abstract: We have isolated muon anti-neutrino charged-current quasi-elastic interactions occurring in the segmented scintillator tracking region of the MINERvA detector running in the NuMI neutrino beam at Fermilab. We measure the flux-averaged differential cross-section, dσ/dQ^2, and compare to several theoretical models of quasi-elastic scattering. Good agreement is obtained with a model where the nucleon… ▽ More We have isolated muon anti-neutrino charged-current quasi-elastic interactions occurring in the segmented scintillator tracking region of the MINERvA detector running in the NuMI neutrino beam at Fermilab. We measure the flux-averaged differential cross-section, dσ/dQ^2, and compare to several theoretical models of quasi-elastic scattering. Good agreement is obtained with a model where the nucleon axial mass, M_A, is set to 0.99 GeV/c^2 but the nucleon vector form factors are modified to account for the observed enhancement, relative to the free nucleon case, of the cross-section for the exchange of transversely polarized photons in electron-nucleus scattering. Our data at higher Q^2 favor this interpretation over an alternative in which the axial mass is increased. △ Less

Submitted 30 March, 2014; v1 submitted 9 May, 2013; originally announced May 2013.

Comments: 8 pages, 5 figures. Added correlation between neutrino and anti-neutrino results in ancillary text files (CSV)

Report number: FERMILAB-PUB-13-147-E

Journal ref: Phys. Rev. Lett. 111, 022501 (2013)

Improved Search for $\bar ν_μ\rightarrow \bar ν_e$ Oscillations in the MiniBooNE Experiment

Authors: The MiniBooNE Collaboration, A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills , et al. (20 additional authors not shown)

Abstract: The MiniBooNE experiment at Fermilab reports results from an analysis of $\bar ν_e$ appearance data from $11.27 \times 10^{20}$ protons on target in antineutrino mode, an increase of approximately a factor of two over the previously reported results. An event excess of $78.4 \pm 28.5$ events ($2.8 σ$) is observed in the energy range $200<E_ν^{QE}<1250$ MeV. If interpreted in a two-neutrino oscilla… ▽ More The MiniBooNE experiment at Fermilab reports results from an analysis of $\bar ν_e$ appearance data from $11.27 \times 10^{20}$ protons on target in antineutrino mode, an increase of approximately a factor of two over the previously reported results. An event excess of $78.4 \pm 28.5$ events ($2.8 σ$) is observed in the energy range $200<E_ν^{QE}<1250$ MeV. If interpreted in a two-neutrino oscillation model, $\barν_μ\rightarrow\barν_e$, the best oscillation fit to the excess has a probability of 66% while the background-only fit has a $χ^2$-probability of 0.5% relative to the best fit. The data are consistent with antineutrino oscillations in the $0.01 < Δm^2 < 1.0$ eV$^2$ range and have some overlap with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector (LSND). All of the major backgrounds are constrained by in-situ event measurements so non-oscillation explanations would need to invoke new anomalous background processes. The neutrino mode running also shows an excess at low energy of $162.0 \pm 47.8$ events ($3.4 σ$) but the energy distribution of the excess is marginally compatible with a simple two neutrino oscillation formalism. Expanded models with several sterile neutrinos can reduce the incompatibility by allowing for CP violating effects between neutrino and antineutrino oscillations. △ Less

Submitted 12 March, 2013; v1 submitted 11 March, 2013; originally announced March 2013.

Comments: Submitted to PRL. Further information provided in arXiv:1207.4809

Report number: LA-UR-13-21523

First Measurement of the Muon Anti-Neutrino Double-Differential Charged Current Quasi-Elastic Cross Section

Authors: A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills, J. Mirabal , et al. (20 additional authors not shown)

Abstract: The largest sample ever recorded of $\numub$ charged-current quasi-elastic (CCQE, $\numub + p \to \mup + n$) candidate events is used to produce the minimally model-dependent, flux-integrated double-differential cross section $\frac{d^{2}σ}{dT_μd\uz}$ for $\numub$ incident on mineral oil. This measurement exploits the unprecedented statistics of the MiniBooNE anti-neutrino mode sample and provides… ▽ More The largest sample ever recorded of $\numub$ charged-current quasi-elastic (CCQE, $\numub + p \to \mup + n$) candidate events is used to produce the minimally model-dependent, flux-integrated double-differential cross section $\frac{d^{2}σ}{dT_μd\uz}$ for $\numub$ incident on mineral oil. This measurement exploits the unprecedented statistics of the MiniBooNE anti-neutrino mode sample and provides the most complete information of this process to date. Also given to facilitate historical comparisons are the flux-unfolded total cross section $σ(E_ν)$ and single-differential cross section $\frac{dσ}{d\qsq}$ on both mineral oil and on carbon by subtracting the $\numub$ CCQE events on hydrogen. The observed cross section is somewhat higher than the predicted cross section from a model assuming independently-acting nucleons in carbon with canonical form factor values. The shape of the data are also discrepant with this model. These results have implications for intra-nuclear processes and can help constrain signal and background processes for future neutrino oscillation measurements. △ Less

Submitted 4 August, 2013; v1 submitted 29 January, 2013; originally announced January 2013.

Comments: 28 pages, 13 figures. Data release at http://www-boone.fnal.gov/for_physicists/data_release/ccqe_nubar/

Report number: FERMILAB-PUB-13-017-E

Journal ref: Phys. Rev. D 88, 032001 (2013)

Letter of Intent: A new investigation of numu to nue oscillations with improved sensitivity in an enhanced MiniBooNE experiment

Authors: A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, R. Cooper, J. M. Conrad, R. Dharmapalan, R. Ford, Z. Djurcic, F. G. Garcia, G. T. Garvey, J. Grange, S. Habib, W. Huelsnitz, R. Imlay, C. Jiang, G. Karagiorgi, W. C. Louis, R. A. Johnson, W. Marsh, C. Mauger, G. B. Mills, C. D. Moore, J. Mousseau, P. Nienaber, B. Osmanov , et al. (11 additional authors not shown)

Abstract: We propose adding 300 mg/l PPO to the existing MiniBooNE detector mineral oil to increase the scintillation response. This will allow the detection of associated neutrons and increase sensitivity to final-state nucleons in neutrino interactions. This increased capability will enable an independent test of whether the current excess seen in the MiniBooNE oscillation search is signal or background.… ▽ More We propose adding 300 mg/l PPO to the existing MiniBooNE detector mineral oil to increase the scintillation response. This will allow the detection of associated neutrons and increase sensitivity to final-state nucleons in neutrino interactions. This increased capability will enable an independent test of whether the current excess seen in the MiniBooNE oscillation search is signal or background. In addition it will enable other neutrino interaction measurements to be made including a search for the strange-quark contribution to the nucleon spin Delta s and a low-energy measurement of charged-current quasielastic scattering. △ Less

Submitted 8 October, 2012; originally announced October 2012.

Comments: 27 pages, 12 figures, Letter of intent submitted to Fermilab for consideration, 10/12

The MINER$ν$A Data Acquisition System and Infrastructure

Authors: G. N. Perdue, L. Bagby, B. Baldin, C. Gingu, J. Olsen, P. Rubinov, E. C. Schulte, R. Bradford, W. K. Brooks, D. A. M. Caicedo, C. M. Castromonte, J. Chvojka, H. da Motta, I. Danko, J. Devan, B. Eberly, J. Felix, L. Fields, G. A. Fiorentini, A. M. Gago, R. Gran, D. A. Harris, K. Hurtado, H. Lee, E. Maher , et al. (18 additional authors not shown)

Abstract: MINER$ν$A (Main INjector ExpeRiment $ν$-A) is a new few-GeV neutrino cross section experiment that began taking data in the FNAL NuMI (Fermi National Accelerator Laboratory Neutrinos at the Main Injector) beam-line in March of 2010. MINER$ν$A employs a fine-grained scintillator detector capable of complete kinematic characterization of neutrino interactions. This paper describes the MINER$ν$A data… ▽ More MINER$ν$A (Main INjector ExpeRiment $ν$-A) is a new few-GeV neutrino cross section experiment that began taking data in the FNAL NuMI (Fermi National Accelerator Laboratory Neutrinos at the Main Injector) beam-line in March of 2010. MINER$ν$A employs a fine-grained scintillator detector capable of complete kinematic characterization of neutrino interactions. This paper describes the MINER$ν$A data acquisition system (DAQ) including the read-out electronics, software, and computing architecture. △ Less

Submitted 5 September, 2012; originally announced September 2012.

Comments: 34 pages, 16 figures

Dual baseline search for muon antineutrino disappearance at 0.1 eV^2 < Δm^2 < 100 eV^2

Authors: MiniBooNE Collaboration, SciBooNE Collaboration, G. Cheng, W. Huelsnitz, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, S. J. Brice, B. C. Brown, L. Bugel, J. Catala-Perez, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, U. Dore, D. A. Finley, R. Ford, A. J. Franke, F. G. Garcia, G. T. Garvey, C. Giganti, J. J. Gomez-Cadenas, J. Grange, P. Guzowski, A. Hanson , et al. (66 additional authors not shown)

Abstract: The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of \bar{ν_μ} at Fermilab's Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their datasets serves to partially constrain some of the flux and cross section uncertain… ▽ More The MiniBooNE and SciBooNE collaborations report the results of a joint search for short baseline disappearance of \bar{ν_μ} at Fermilab's Booster Neutrino Beamline. The MiniBooNE Cherenkov detector and the SciBooNE tracking detector observe antineutrinos from the same beam, therefore the combined analysis of their datasets serves to partially constrain some of the flux and cross section uncertainties. Uncertainties in the ν_μ background were constrained by neutrino flux and cross section measurements performed in both detectors. A likelihood ratio method was used to set a 90% confidence level upper limit on \bar{ν_μ} disappearance that dramatically improves upon prior limits in the Δm^2=0.1-100 eV^2 region. △ Less

Submitted 5 November, 2012; v1 submitted 1 August, 2012; originally announced August 2012.

Comments: 15 pages, 27 figures

Report number: FERMILAB-PUB-12-477-PPD

Journal ref: Phys.Rev. D86 (2012) 052009

A Combined $ν_μ\to ν_e$ and $\barν_μ\to \barν_e$ Oscillation Analysis of the MiniBooNE Excesses

Authors: MiniBooNE Collaboration, A. A. Aguilar-Arevalo, B. C. Brown, L. Bugel, G. Cheng, E. D. Church, J. M. Conrad, R. Dharmapalan, Z. Djurcic, D. A. Finley, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, W. Huelsnitz, C. Ignarra, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, W. C. Louis, C. Mariani, W. Marsh, G. B. Mills , et al. (20 additional authors not shown)

Abstract: The MiniBooNE experiment at Fermilab reports results from an analysis of the combined $ν_e$ and $\bar ν_e$ appearance data from $6.46 \times 10^{20}$ protons on target in neutrino mode and $11.27 \times 10^{20}$ protons on target in antineutrino mode. A total excess of $240.3 \pm 34.5 \pm 52.6$ events ($3.8 σ$) is observed from combining the two data sets in the energy range $200<E_ν^{QE}<1250$ Me… ▽ More The MiniBooNE experiment at Fermilab reports results from an analysis of the combined $ν_e$ and $\bar ν_e$ appearance data from $6.46 \times 10^{20}$ protons on target in neutrino mode and $11.27 \times 10^{20}$ protons on target in antineutrino mode. A total excess of $240.3 \pm 34.5 \pm 52.6$ events ($3.8 σ$) is observed from combining the two data sets in the energy range $200<E_ν^{QE}<1250$ MeV. In a combined fit for CP-conserving $ν_μ\rightarrow ν_e$ and $\barν_μ\rightarrow\barν_e$ oscillations via a two-neutrino model, the background-only fit has a $χ^2$-probability of 0.03% relative to the best oscillation fit. The data are consistent with neutrino oscillations in the $0.01 < Δm^2 < 1.0$ eV$^2$ range and with the evidence for antineutrino oscillations from the Liquid Scintillator Neutrino Detector (LSND). △ Less

Submitted 27 August, 2012; v1 submitted 19 July, 2012; originally announced July 2012.

Comments: Minor wording and figure changes and added references

Report number: LA-UR-12-23041; Fermilab-PUB-12-394-AD-PPD

Demonstration of Communication using Neutrinos

Authors: D. D. Stancil, P. Adamson, M. Alania, L. Aliaga, M. Andrews, C. Araujo Del Castillo, L. Bagby, J. L. Bazo Alba, A. Bodek, D. Boehnlein, R. Bradford, W. K. Brooks, H. Budd, A. Butkevich, D. A. M. Caicedo, D. P. Capista, C. M. Castromonte, A. Chamorro, E. Charlton, M. E. Christy, J. Chvojka, P. D. Conrow, I. Danko, M. Day, J. Devan , et al. (87 additional authors not shown)

Abstract: Beams of neutrinos have been proposed as a vehicle for communications under unusual circumstances, such as direct point-to-point global communication, communication with submarines, secure communications and interstellar communication. We report on the performance of a low-rate communications link established using the NuMI beam line and the MINERvA detector at Fermilab. The link achieved a decode… ▽ More Beams of neutrinos have been proposed as a vehicle for communications under unusual circumstances, such as direct point-to-point global communication, communication with submarines, secure communications and interstellar communication. We report on the performance of a low-rate communications link established using the NuMI beam line and the MINERvA detector at Fermilab. The link achieved a decoded data rate of 0.1 bits/sec with a bit error rate of 1% over a distance of 1.035 km, including 240 m of earth. △ Less

Submitted 9 April, 2012; v1 submitted 13 March, 2012; originally announced March 2012.

Comments: 10 pages, 7 figures, updated with final figures used in Modern Physics Letters A publication

Report number: FNAL PUB-12-073-E

Journal ref: Mod. Phys. Lett. A 27 (2012) 1250077

Arachne - A web-based event viewer for MINERvA

Authors: N. Tagg, J. Brangham, J. Chvojka, M. Clairemont, M. Day, B. Eberly, J. Felix, L. Fields, A. M. Gago, R. Gran, D. A. Harris, M. Kordosky, H. Lee, G. Maggi, E. Maher, W. A. Mann, C. M. Marshall, K. S. McFarland, A. M. McGowan, A. Mislivec, J. Mousseau, B. Osmanov, J. Osta, V. Paolone, G. Perdue , et al. (13 additional authors not shown)

Abstract: Neutrino interaction events in the MINERvA detector are visually represented with a web-based tool called Arachne. Data are retrieved from a central server via AJAX, and client-side JavaScript draws images into the user's browser window using the draft HTML 5 standard. These technologies allow neutrino interactions to be viewed by anyone with a web browser, allowing for easy hand-scanning of parti… ▽ More Neutrino interaction events in the MINERvA detector are visually represented with a web-based tool called Arachne. Data are retrieved from a central server via AJAX, and client-side JavaScript draws images into the user's browser window using the draft HTML 5 standard. These technologies allow neutrino interactions to be viewed by anyone with a web browser, allowing for easy hand-scanning of particle interactions. Arachne has been used in MINERvA to evaluate neutrino data in a prototype detector, to tune reconstruction algorithms, and for public outreach and education. △ Less

Submitted 19 January, 2012; v1 submitted 22 November, 2011; originally announced November 2011.

Comments: 8 pages; 3 figures

Report number: FERMILAB-PUB-11-625-E

Journal ref: Nucl.Inst.Meth. 676 (2012) 44-49

Test of Lorentz and CPT violation with Short Baseline Neutrino Oscillation Excesses

Authors: The MiniBooNE Collaboration, A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, R. Dharmapalan, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, C. Green, J. A. Green, T. L. Hart, E. Hawker, W. Huelsnitz , et al. (63 additional authors not shown)

Abstract: The sidereal time dependence of MiniBooNE electron neutrino and anti-electron neutrino appearance data are analyzed to search for evidence of Lorentz and CPT violation. An unbinned Kolmogorov-Smirnov test shows both the electron neutrino and anti-electron neutrino appearance data are compatible with the null sidereal variation hypothesis to more than 5%. Using an unbinned likelihood fit with a Lor… ▽ More The sidereal time dependence of MiniBooNE electron neutrino and anti-electron neutrino appearance data are analyzed to search for evidence of Lorentz and CPT violation. An unbinned Kolmogorov-Smirnov test shows both the electron neutrino and anti-electron neutrino appearance data are compatible with the null sidereal variation hypothesis to more than 5%. Using an unbinned likelihood fit with a Lorentz-violating oscillation model derived from the Standard Model Extension (SME) to describe any excess events over background, we find that the electron neutrino appearance data prefer a sidereal time-independent solution, and the anti-electron neutrino appearance data slightly prefer a sidereal time-dependent solution. Limits of order 10E-20 GeV are placed on combinations of SME coefficients. These limits give the best limits on certain SME coefficients for muon neutrino to electron neutrino and anti-muon neutrino to anti-electron neutrino oscillations. The fit values and limits of combinations of SME coefficients are provided. △ Less

Submitted 22 June, 2012; v1 submitted 15 September, 2011; originally announced September 2011.

Comments: 14 pages, 3 figures, and 2 tables, submitted to Physics Letters B

Report number: FERMILAB-PUB-11-834-E

Journal ref: Physics Letters B 718 (2013), pp. 1303-1308

MINERvA Detector: Description and Performance

Authors: Bari Osmanov

Abstract: The MINERvA experiment is aimed at precisely measuring the cross-sections for various neutrino interaction channels. It is located at Fermilab in the underground cavern in front of MINOS near detector. MINERvA is a fine-grained scintillator with electromagnetic and hadronic calorimetry regions. There are various nuclear targets located inside and in front of the detector for studying nuclear mediu… ▽ More The MINERvA experiment is aimed at precisely measuring the cross-sections for various neutrino interaction channels. It is located at Fermilab in the underground cavern in front of MINOS near detector. MINERvA is a fine-grained scintillator with electromagnetic and hadronic calorimetry regions. There are various nuclear targets located inside and in front of the detector for studying nuclear medium effects in neutrino-induced interactions. The installation was completed in March 2010 and since then the detector has been collecting data. In this paper, the method for determining the neutrino flux is described in detail with the associated uncertainties as well as the techniques for their reduction. The general structure of the detector is given with the emphasis on the nuclear targets region. Preliminary results related to nuclear effects studies are presented followed by their discussion and future plans. △ Less

Submitted 13 September, 2011; originally announced September 2011.

Comments: 6 pages, 9 figures

Dual baseline search for muon neutrino disappearance at 0.5 eV^2 < Δm^2 < 40 eV^2

Authors: MiniBooNE, SciBooNE Collaborations, :, K. B. M. Mahn, Y. Nakajima, A. A. Aguilar-Arevalo, J. L. Alcaraz-Aunion, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, J. Catala-Perez, G. Cheng, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, R. Dharmapalan, Z. Djurcic, U. Dore, D. A. Finley, B. T. Fleming, R. Ford , et al. (105 additional authors not shown)

Abstract: The SciBooNE and MiniBooNE collaborations report the results of a ν_μdisappearance search in the Δm^2 region of 0.5-40 eV^2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) l… ▽ More The SciBooNE and MiniBooNE collaborations report the results of a ν_μdisappearance search in the Δm^2 region of 0.5-40 eV^2. The neutrino rate as measured by the SciBooNE tracking detectors is used to constrain the rate at the MiniBooNE Cherenkov detector in the first joint analysis of data from both collaborations. Two separate analyses of the combined data samples set 90% confidence level (CL) limits on ν_μdisappearance in the 0.5-40 eV^2 Δm^2 region, with an improvement over previous experimental constraints between 10 and 30 eV^2. △ Less

Submitted 28 December, 2011; v1 submitted 28 June, 2011; originally announced June 2011.

Comments: 10 pages, 9 figures. Re-submitted to Phys. Rev. D

Report number: FERMILAB-PUB-11-304-E

Journal ref: Phys. Rev. D 85, 032007 (2012)

Measurement of the neutrino component of an anti-neutrino beam observed by a non-magnetized detector

Authors: A. A. Aguilar-Arevalo, C. E. Anderson, S. J. Brice, B. C. Brown, L. Bugel, J. M. Conrad, R. Dharmapalan, Z. Djurcic, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, J. A. Green, R. Imlay, R. A. Johnson, G. Karagiorgi, T. Katori, T. Kobilarcik, S. K. Linden, W. C. Louis, K. B. M. Mahn, W. Marsh, C. Mauger, W. Metcalf , et al. (29 additional authors not shown)

Abstract: Two independent methods are employed to measure the neutrino flux of the anti-neutrino-mode beam observed by the MiniBooNE detector. The first method compares data to simulated event rates in a high purity $\numu$ induced charged-current single $\pip$ (CC1$\pip$) sample while the second exploits the difference between the angular distributions of muons created in $\numu$ and $\numub$ charged-curre… ▽ More Two independent methods are employed to measure the neutrino flux of the anti-neutrino-mode beam observed by the MiniBooNE detector. The first method compares data to simulated event rates in a high purity $\numu$ induced charged-current single $\pip$ (CC1$\pip$) sample while the second exploits the difference between the angular distributions of muons created in $\numu$ and $\numub$ charged-current quasi-elastic (CCQE) interactions. The results from both analyses indicate the prediction of the neutrino flux component of the pre-dominately anti-neutrino beam is over-estimated - the CC1$\pip$ analysis indicates the predicted $\numu$ flux should be scaled by $0.76 \pm 0.11$, while the CCQE angular fit yields $0.65 \pm 0.23$. The energy spectrum of the flux prediction is checked by repeating the analyses in bins of reconstructed neutrino energy, and the results show that the spectral shape is well modeled. These analyses are a demonstration of techniques for measuring the neutrino contamination of anti-neutrino beams observed by future non-magnetized detectors. △ Less

Submitted 29 January, 2013; v1 submitted 9 February, 2011; originally announced February 2011.

Comments: 15 pages, 7 figures, published in Physical Review D, latest version reflects changes from referee comments

Journal ref: Phys.Rev.D84:072005(2011)

Measurement of Neutrino-Induced Charged-Current Charged Pion Production Cross Sections on Mineral Oil at E$_ν\sim 1~\textrm{GeV}$

Authors: A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, R. Dharmapalan, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, C. Green, J. A. Green, T. L. Hart, E. Hawker, R. Imlay, R. A. Johnson , et al. (61 additional authors not shown)

Abstract: Using a high-statistics, high-purity sample of $ν_μ$-induced charged current, charged pion events in mineral oil (CH$_2$), MiniBooNE reports a collection of interaction cross sections for this process. This includes measurements of the CC$π^+$ cross section as a function of neutrino energy, as well as flux-averaged single- and double-differential cross sections of the energy and direction of both… ▽ More Using a high-statistics, high-purity sample of $ν_μ$-induced charged current, charged pion events in mineral oil (CH$_2$), MiniBooNE reports a collection of interaction cross sections for this process. This includes measurements of the CC$π^+$ cross section as a function of neutrino energy, as well as flux-averaged single- and double-differential cross sections of the energy and direction of both the final-state muon and pion. In addition, each of the single-differential cross sections are extracted as a function of neutrino energy to decouple the shape of the MiniBooNE energy spectrum from the results. In many cases, these cross sections are the first time such quantities have been measured on a nuclear target and in the 1 GeV energy range. △ Less

Submitted 31 March, 2011; v1 submitted 15 November, 2010; originally announced November 2010.

Comments: 29 pages and 28 figures

Journal ref: Phys.Rev.D83:052007,2011

Measurement of $ν_μ$-induced charged-current neutral pion production cross sections on mineral oil at $E_ν\in0.5-2.0$ GeV

Authors: A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, R. Dharmapalan, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, C. Green, J. A. Green, T. L. Hart, E. Hawker, R. Imlay, R. A. Johnson , et al. (61 additional authors not shown)

Abstract: Using a custom 3 Čerenkov-ring fitter, we report cross sections for $ν_μ$-induced charged-current single $π^0$ production on mineral oil (\chtwo) from a sample of 5810 candidate events with 57% signal purity over an energy range of $0.5-2.0$GeV. This includes measurements of the absolute total cross section as a function of neutrino energy, and flux-averaged differential cross sections measured in… ▽ More Using a custom 3 Čerenkov-ring fitter, we report cross sections for $ν_μ$-induced charged-current single $π^0$ production on mineral oil (\chtwo) from a sample of 5810 candidate events with 57% signal purity over an energy range of $0.5-2.0$GeV. This includes measurements of the absolute total cross section as a function of neutrino energy, and flux-averaged differential cross sections measured in terms of $Q^2$, $μ^-$ kinematics, and $π^0$ kinematics. The sample yields a flux-averaged total cross section of $(9.2\pm0.3_{stat.}\pm1.5_{syst.})\times10^{-39}$cm$^2$/CH$_2$ at mean neutrino energy of 0.965GeV. △ Less

Submitted 10 February, 2011; v1 submitted 15 October, 2010; originally announced October 2010.

Comments: 21 pages, 14 figures, and 11 tables

Journal ref: Phys.Rev.D83:052009,2011

First Measurement of the Muon Neutrino Charged Current Quasielastic Double Differential Cross Section

Authors: MiniBooNE Collaboration, A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Grange, C. Green, J. A. Green, T. L. Hart, E. Hawker, R. Imlay, R. A. Johnson , et al. (61 additional authors not shown)

Abstract: A high-statistics sample of charged-current muon neutrino scattering events collected with the MiniBooNE experiment is analyzed to extract the first measurement of the double differential cross section ($\frac{d^2σ}{dT_μd\cosθ_μ}$) for charged-current quasielastic (CCQE) scattering on carbon. This result features minimal model dependence and provides the most complete information on this process t… ▽ More A high-statistics sample of charged-current muon neutrino scattering events collected with the MiniBooNE experiment is analyzed to extract the first measurement of the double differential cross section ($\frac{d^2σ}{dT_μd\cosθ_μ}$) for charged-current quasielastic (CCQE) scattering on carbon. This result features minimal model dependence and provides the most complete information on this process to date. With the assumption of CCQE scattering, the absolute cross section as a function of neutrino energy ($σ[E_ν]$) and the single differential cross section ($\frac{dσ}{dQ^2}$) are extracted to facilitate comparison with previous measurements. These quantities may be used to characterize an effective axial-vector form factor of the nucleon and to improve the modeling of low-energy neutrino interactions on nuclear targets. The results are relevant for experiments searching for neutrino oscillations. △ Less

Submitted 29 July, 2010; v1 submitted 12 February, 2010; originally announced February 2010.

Comments: 22 pages, 16 figures, published in Physical Review D, latest version to reflect changes in PRD editing

Report number: FERMILAB-PUB-10-046-E

Journal ref: Phys.Rev.D81:092005,2010

Measurement of ν_μand \barν_μinduced neutral current single $π^0$ production cross sections on mineral oil at E_νO(1 GeV)

Authors: The MiniBooNE Collaboration, A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Bugel, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, J. Gonzales, J. Grange, C. Green, J. A. Green, T. L. Hart, E. Hawker, R. Imlay , et al. (62 additional authors not shown)

Abstract: MiniBooNE reports the first absolute cross sections for neutral current single π^0 production on CH_2 induced by neutrino and antineutrino interactions measured from the largest sets of NC π^0 events collected to date. The principal result consists of differential cross sections measured as functions of π^0 momentum and π^0 angle averaged over the neutrino flux at MiniBooNE. We find total cross… ▽ More MiniBooNE reports the first absolute cross sections for neutral current single π^0 production on CH_2 induced by neutrino and antineutrino interactions measured from the largest sets of NC π^0 events collected to date. The principal result consists of differential cross sections measured as functions of π^0 momentum and π^0 angle averaged over the neutrino flux at MiniBooNE. We find total cross sections of (4.76+/-0.05_{stat}+/-0.76_{sys})*10^{-40} cm^2/nucleon at a mean energy of <E_ν>=808 MeV and (1.48+/-0.05_{stat}+/-0.23_{sys})*10^{-40} cm^2/nucleon at a mean energy of <E_ν>=664 MeV for ν_μand \barν_μinduced production, respectively. In addition, we have included measurements of the neutrino and antineutrino total cross sections for incoherent exclusive NC 1π^0 production corrected for the effects of final state interactions to compare to prior results. △ Less

Submitted 27 January, 2010; v1 submitted 11 November, 2009; originally announced November 2009.

Comments: 13 pages, 12 figures, 4 tables

Journal ref: Phys.Rev.D81:013005,2010

A Letter of Intent to Build a MiniBooNE Near Detector: BooNE

Authors: I. Stancu, Z. Djurcic, D. Smith, R. Ford, T. Kobilarcik, W. Marsh, C. D. Moore, J. Grange, B. Osmanov, H. Ray, G. T. Garvey, J. A. Green, W. C. Louis, C. Mauger, G. B. Mills, Z. Pavlovic, R. Van de Water, D. H. White, G. P. Zeller, W. Metcalf, B. P. Roe, A. A. Aguilar-Arevalo

Abstract: There is accumulating evidence for a difference between neutrino and antineutrino oscillations at the $\sim 1$ eV$^2$ scale. The MiniBooNE experiment observes an unexplained excess of electron-like events at low energies in neutrino mode, which may be due, for example, to either a neutral current radiative interaction, sterile neutrino decay, or to neutrino oscillations involving sterile neutrin… ▽ More There is accumulating evidence for a difference between neutrino and antineutrino oscillations at the $\sim 1$ eV$^2$ scale. The MiniBooNE experiment observes an unexplained excess of electron-like events at low energies in neutrino mode, which may be due, for example, to either a neutral current radiative interaction, sterile neutrino decay, or to neutrino oscillations involving sterile neutrinos and which may be related to the LSND signal. No excess of electron-like events ($-0.5 \pm 7.8 \pm 8.7$), however, is observed so far at low energies in antineutrino mode. Furthermore, global 3+1 and 3+2 sterile neutrino fits to the world neutrino and antineutrino data suggest a difference between neutrinos and antineutrinos with significant ($\sin^22θ_{μμ} \sim 35%$) $\bar ν_μ$ disappearance. In order to test whether the low-energy excess is due to neutrino oscillations and whether there is a difference between $ν_μ$ and $\bar ν_μ$ disappearance, we propose building a second MiniBooNE detector at (or moving the existing MiniBooNE detector to) a distance of $\sim 200$ m from the Booster Neutrino Beam (BNB) production target. With identical detectors at different distances, most of the systematic errors will cancel when taking a ratio of events in the two detectors, as the neutrino flux varies as $1/r^2$ to a calculable approximation. This will allow sensitive tests of oscillations for both $ν_e$ and $\bar ν_e$ appearance and $ν_μ$ and $\bar ν_μ$ disappearance. Furthermore, a comparison between oscillations in neutrino mode and antineutrino mode will allow a sensitive search for CP and CPT violation in the lepton sector at short baseline ($Δm^2 > 0.1$ eV$^2$). △ Less

Submitted 14 October, 2009; originally announced October 2009.

Comments: 43 pages, 40 figures

Measurement of the ν_μcharged current π^+ to quasi-elastic cross section ratio on mineral oil in a 0.8 GeV neutrino beam

Authors: A. A. Aguilar-Arevalo, C. E. Anderson, A. O. Bazarko, S. J. Brice, B. C. Brown, L. Buge, J. Cao, L. Coney, J. M. Conrad, D. C. Cox, A. Curioni, Z. Djurcic, D. A. Finley, B. T. Fleming, R. Ford, F. G. Garcia, G. T. Garvey, C. Green, J. A. Green, T. L. Hart, E. Hawker, R. Imlay, R. A. Johnson, G. Karagiorgi, P. Kasper , et al. (56 additional authors not shown)

Abstract: Using high statistics samples of charged current $ν_μ$ interactions, MiniBooNE reports a measurement of the single charged pion production to quasi-elastic cross section ratio on mineral oil (CH$_2$), both with and without corrections for hadron re-interactions in the target nucleus. The result is provided as a function of neutrino energy in the range 0.4 GeV $< E_ν<$ 2.4 GeV with 11% precision… ▽ More Using high statistics samples of charged current $ν_μ$ interactions, MiniBooNE reports a measurement of the single charged pion production to quasi-elastic cross section ratio on mineral oil (CH$_2$), both with and without corrections for hadron re-interactions in the target nucleus. The result is provided as a function of neutrino energy in the range 0.4 GeV $< E_ν<$ 2.4 GeV with 11% precision in the region of highest statistics. The results are consistent with previous measurements and the prediction from historical neutrino calculations. △ Less

Submitted 20 April, 2009; originally announced April 2009.

Comments: 4 pages, 2 figures

Journal ref: Phys.Rev.Lett.103:081801,2009