Bulletin of the American Physical Society
APS April Meeting 2012
Volume 57, Number 3
Saturday–Tuesday, March 31–April 3 2012; Atlanta, Georgia
Session L10: Neutrino Beams and Backgrounds |
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Sponsoring Units: DPF Chair: Kate Scholberg, Duke University Room: Embassy A |
Sunday, April 1, 2012 3:30PM - 3:42PM |
L10.00001: Magnet induced background to a neutrino events sample in the T2K near detector Oleg Perevozchikov The T2K experiment is an off-axis long baseline neutrino oscillation experiment primarily constructed to search for conversion of muon neutrinos to electron neutrinos thereby measuring the last unknown mixing angle theta13. For this purpose high intensity beam of muon neutrinos is produced at the JPARC and sent 295 kilometers across Japan towards the Super-Kamiokande detector. The neutrino energy spectrum, flavor content and interaction rates of the unoscillated neutrino beam are measured by T2K off-axis near detector (ND280) components that are contained inside the dipole magnet. Such measurements are required to minimize systematic uncertainties in neutrino oscillation analysis. In this presentation I will overview the T2K experiment and emphasize on the analysis of the background coming from the magnet for muon neutrino charged current (CC) interactions. Based on simulated neutrino interactions inside ND280 detector the contribution of magnet induced events was estimated. To verify the agreement between data and Monte Carlo and to confirm the reliability of predicted magnet induced background the analysis of CC neutrino interactions in the Side Muon Range Detector was performed and will be discussed during the presentation. [Preview Abstract] |
Sunday, April 1, 2012 3:42PM - 3:54PM |
L10.00002: NuMI Beam Flux Studies for MINERvA Leonidas Aliaga Soplin MINER$\nu$A is a few-GeV neutrino scattering experiment which is required to understand the neutrino beam flux in order to make absolute cross section measurements. We have three techniques for constraining the flux: in situ measurements, external hadron production data and muon monitors. In this presentation I will discuss the details and our progress on these efforts. [Preview Abstract] |
Sunday, April 1, 2012 3:54PM - 4:06PM |
L10.00003: Absolute Flux Measurement Using Fine Grained Tracker Near Detector For LBNE Hongyue Duyang, Xinchun Tian, Sanjib Mishra The proposed Long-Baseline Neutrino Experiment (LBNE) is the next generation neutrino oscillation experiment designed to measure neutrino mixing angle $\theta_{13}$, CP-violation and mass hierarchy. A Fine Grained Tracker (FGT), based upon straw-tubes, is the reference near detector design for LBNE. We show that using $\nu$-electron neutral and charged (inverse muon decay) current scattering, the LBNE-ND should be able to measure the absolute neutrino flux to a precision of $\sim$ 3\% over a 5-year run. [Preview Abstract] |
Sunday, April 1, 2012 4:06PM - 4:18PM |
L10.00004: ABSTRACT WITHDRAWN |
Sunday, April 1, 2012 4:18PM - 4:30PM |
L10.00005: ABSTRACT WITHDRAWN |
Sunday, April 1, 2012 4:30PM - 4:42PM |
L10.00006: Coherent $\rho$ Production in Neutrino-nucleus Interactions Xinchun Tian, Chris Kullenberg, Hongyue Duyang, Sanjib Mishra The new generation of neutrino experiments will measure (1) the unknown small mixing angle - $\theta_{13}$, (2) the CP violation phase - $\delta_{\rm CP}$, and (3) the mass hierarchy. To correctly interpret the oscillation data, one needs to understand the neutrino-nucleus interaction very well. The charged or neutral $\rho$ can be produced coherently in the neutrino nucleus interactions. We present a study of Coh$\rho$ production in a fine grained tracker where momenta, charges, and photons are precisely measured. The high resolution straw tube tracker (STT), built upon the NOMAD experience, has been proposed as a near detector for LBNE. We present a sensitivity study of Coh$\rho$ production in the STT in LBNE. The high statistics NOMAD data serve to check our calculation. [Preview Abstract] |
Sunday, April 1, 2012 4:42PM - 4:54PM |
L10.00007: Using ND280's P0D to Measure High Energy $\nu_e$ in the T2K Beam Ian Taylor, Jay Hyun Jo We present the first official results from T2K's $\pi^0$ detector (P0D), part of the off-axis near detector suite, ND280. The analysis measured the production rate of high energy $\nu_e$, intrinsic to the T2K beam. This rate was found to agree with the rate predicted for T2K's 2011 $\nu_e$ appearance measurement (arXiv:1106.2822), within statistical and systematic errors, and will be used to constrain the intrinsic $\nu_e$ background for T2K's next $\nu_e$ oscillation result. [Preview Abstract] |
Sunday, April 1, 2012 4:54PM - 5:06PM |
L10.00008: T2K Outer Detector Events Taritree Wongjirad In the long-baseline neutrino oscillation experiment, T2K, the Super-Kamiokande (Super-K) detector is used to detect neutrino interactions from a beam 295 km away. Super-K is a 40 kTon water Cerenkov detector that is divided into two segments: a cylindrical inner volume, the Inner Detector (ID), nested inside a cylindrical outer volume, the Outer Detector (OD). Typically, the OD's role is to act as a cosmic ray veto for the ID. However, in T2K, events that involve signals in the OD can be kept for use in neutrino analyses. This is because the background event rate is highly suppressed when events are accepted within the small time window coincident with the arrival of beam neutrinos at Super-K. Also, an understanding of events outside the ID was helpful in the recent T2K result, which showed an indication of non-zero $\theta_{13}$. The six neutrino events used in the analyses were clustered near the upstream inner detector wall. A study was made that concluded that the possible contribution of background events from outside the ID to the six signal events was small. In this talk, I will describe the techniques used to select neutrino events involving the OD, possible future analyses that use these events, and our study of background events due to interactions outside the ID. [Preview Abstract] |
Sunday, April 1, 2012 5:06PM - 5:18PM |
L10.00009: Evaluation of cosmogenic production of chlorine-40 for an argon-based long baseline neutrino experiment Dongming Mei, D'Ann Barker, Chao Zhang We evaluate the cosmogenic production rates of chlorine-40 that are a potential source of background for an argon-based long baseline neutrino experiment at Sanford Underground Research Facility (SURF). Using the measured muon fluxes at different levels of the Homestake mine, we use GEANT4 to investigate the cosmogenic production of chlorine-40 by muons through the stopping muon capture and by the muon-induced neutrons via (n,p) reaction. We find that the simulated production rates agree closely with the analytic model prediction. The formalism is provided that describes the ratio of the stopping muons to through-going muons as a function of depth and as a function of the thickness of the detector. The production rate of chlorine-40 as a function of depth and the mass of detector will also be discussed. We conclude that the cosmogenic chlorine-40 produced inside the detector can result in large backgrounds for an argon-based long baseline neutrino experiment at a depth of less than 4000 mwe. [Preview Abstract] |
Sunday, April 1, 2012 5:18PM - 5:30PM |
L10.00010: Inclusive Charged-Current $\nu_{\mu}$ Analysis of the Pi-Zero Detector at T2K Robert A. Johnson The T2K long-baseline neutrino experiment is designed to measure the neutrino mixing angle $\theta_{13}$ as well as perform a precision measurement of oscillation parameters for $\nu_{\mu}$ disappearance. A beam of muon neutrinos originating from the Japan Proton Accelerator Research Complex (J-PARC) is measured both at a near detector (ND280, located onsite at J-PARC 280 m away from the beam's origin) and a far detector (Super-Kamiokande, 295 km away). This talk presents an analysis of inclusive charged-current $\nu_{\mu}$ events from interactions within the Pi-Zero detector, a subdetector component of ND280. The details of this measurement -- including analysis cuts and systematic error studies -- will be reported. The analysis, along with a separate and complementary analysis using other subdetectors within ND280, will be used to measure the inclusive charged-current $\nu_{\mu}$ flux and provide input to the combined near/far oscillation analysis. [Preview Abstract] |
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