Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session H7: Neutrino Cross Sections and Flux I |
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Sponsoring Units: DPF DNP Chair: Vadim Rusu, Fermi National Accelerator Laboratory Room: Key 3 |
Sunday, April 12, 2015 8:30AM - 8:42AM |
H7.00001: Anit-Nu/Nu Cross Section Ratio Using P0D+TPC1 Events Thomas Campbell, Erez Reinherz-Aronis, Walter Toki Recent anti-neutrino data taken by the T2K experiment is used to measure the ratio of the cross sections for charged current interactions of muon type neutrinos relative to anti-neutrinos. Theoretical estimates for charged current quasi-elastic neutrino-quark scattering predict this ratio should be approximately $\frac{1}{3}$. This measurement used the $\pi^{0}$ detector (P0D) and a time projection chamber (TPC1) directly downstream at the ND-280 complex of the T2K experiment. Neutrino interactions occurring in the P0D with an exiting muon whose momentum is measured by TPC1 were selected. Using these events, the ratio was calculated, and relevant systematic uncertainties were evaluated. [Preview Abstract] |
Sunday, April 12, 2015 8:42AM - 8:54AM |
H7.00002: A Measurement of the $\nu_{\mathrm{\mu }}$ Charged Current Quasielastic Cross-section on Water with T2K's Near Detector Tianlu Yuan, Jeremy Lopez, Alysia Marino The T2K experiment has collected an impressive amount of data the past few years useful for both oscillation analyses and precision measurements. Its near-detector, ND280, comprising of several sub-detectors, include water targets that allow for the extraction of a water-based cross-section measurement. We present a selection of $\nu_{\mathrm{\mu }}$ charged current events occurring within the Pi-Zero Detector (P{\O}D). The charged, outgoing tracks are required to enter and be identified by the Tracker of T2K's near-detector. Our sample corresponds to approximately 6x10$^{\mathrm{20}}$ protons on target. The cross section is determined using an iterative Baysian unfolding technique, which includes all systematic uncertainties. By separating the dataset into time periods when the P{\O}D is filled with water and when it is empty, a subtraction method provides a distribution of $\nu_{\mathrm{\mu }}$ interactions on water only. In this way, we produce a measurement of the $\nu_{\mathrm{\mu }}$ CCQE cross-section on water. [Preview Abstract] |
Sunday, April 12, 2015 8:54AM - 9:06AM |
H7.00003: Neutrino-Nucleon Deep Inelastic Scattering in MINERvA Anne Norrick Neutrino-Nucleon Deep Inelastic Scattering (DIS) events provide a probe into the structure of the nucleus that cannot be accessed via charged lepton-nucleon interactions. The MINERvA experiment is stationed in the Neutrinos from the Main Injector (NuMI) beam line at Fermi National Accelerator Laboratory. The projected sensitivity of nuclear structure function analyses using MINERvA's suite of nuclear targets (C, CH, Fe and Pb) in the upgraded ~6 GeV neutrino energy NuMI beam will be explored, and their impact discussed. [Preview Abstract] |
Sunday, April 12, 2015 9:06AM - 9:18AM |
H7.00004: Measurement of charged current single charged pion production cross-section on water with P0D detector Shamil Assylbekov, Robert Wilson, Tomasz Wachala This work describes the first neutrino cross-section measurement of charged-current (CC) single charged pion (1 $\pi^{+}$) interaction channel on water as a target. There is some disagreement between measurements on carbon for this process, which effects the precision of neutrino oscillation results. P0D detector of the T2K experiment has been taking neutrino interaction data since 2009 in configurations with and without a water target. Using a statistical water-in/water-out event rate subtraction, a measurement of $\nu_{\mu}$-induced CC1$\pi^{+}$ cross-section on water is reported to be $\sigma = 1.10\cdot10^{-39}~^{+35.27\%}_{-32.38\%}~cm^{2}$, integrated over the entire T2K energy range. The measurement is based on a sample of 2703 events selected from beam runs of $2.64\times10^{20}$ protons-on-target with the P0D water-in configuration, and 2187 events selected from $3.71\times10^{20}$ protons-on-target with the water-out configuration. The corresponding Monte Carlo (MC) simulation predicted numbers of background events to be 1387.2 and 1046.0 for the water-in and water-out configurations, respectively. Data favors a smaller cross-section when compared with the model, but within uncertainty is consistent with $\sigma = 1.26\cdot10^{-39}~cm^{2}$ predicted by MC. [Preview Abstract] |
Sunday, April 12, 2015 9:18AM - 9:30AM |
H7.00005: Neutral current $\pi^0$ analysis in the NO$\nu$A experiment Himansu Sahoo The NO$\nu$A experiment is a long-baseline accelerator based neutrino oscillation experiment using an upgraded NuMI neutrino beam from Fermilab. By studying electron neutrino and antineutrino appearance, the experiment aims to determine the neutrino mass hierarchy and will provide constraints on $CP$ violation. NO$\nu$A Detector construction is complete and both detectors have started collecting neutrino data. Interactions in which an energetic $\pi^0$ is produced in the final state are one of the dominant sources of backgrounds to the $\nu_e$ search, but also provide a rich sample of events to characterize the detector. Reconstruction of photon showers from $\pi^0$ decays provide input for calibration over the full energy range of interest for the $\nu_e$ appearance analysis. Large uncertainties in model prediction requires a precise measurement of NC $\pi^0$ production rates and cross-sections using NO$\nu$A data. In this talk, we will present the neutral current $\pi^0$ analysis in NO$\nu$A and the first results using data from Near Detector. [Preview Abstract] |
Sunday, April 12, 2015 9:30AM - 9:42AM |
H7.00006: Measurement of Neutral Current 1$\pi^0$ production in $\nu_{\mu}$ interaction on water with the Pi0 Detector at T2K Zoya Vallari The T2K Experiment is a long baseline neutrino experiment which looks for $\nu_e$ appearance in $\nu_{\mu}$ beam to measure the lepton sector mixing angle $\theta_{13}$ as it's primary goal. It has a baseline of 295 km, going from Tokai on the east coast to Kamioka mine on the west coast of Japan. The far detector, Super Kamiokande, is a Water Cherenkov detector. One of the dominant backgrounds for the far detector in the oscillation measurement is the Neutral Current Single $\pi^0$ (NC1$\pi^0$) interaction. In order to constrain this background, the $\pi^0$ detector (P$\emptyset$D) was placed in the near detector complex, 280 meters from the beam origin. The P$\emptyset$D was constructed with a water target that can be filled and drained in order to perform a statistical subtraction to measure various cross sections on-water. This analysis presents the on-water NC1$\pi^0$ rate measurement with a neutrino beam energy less than 1 GeV. The on-water interactions were extracted by comparing the interactions of water-in configuration with water-out configuration. The calculation of NC1$\pi^0$ absolute cross-section on water is on-going, which when completed would be the first such measurement in the world. [Preview Abstract] |
Sunday, April 12, 2015 9:42AM - 9:54AM |
H7.00007: Measurement of Neutrino-Induced Coherent Pion Production and the Diffractive Background in MINERvA Alicia Gomez Neutrino-induced coherent charged pion production is a unique neutrino-nucleus scattering process in which a muon and pion are produced while the nucleus is left in its ground state. The MINERvA experiment has made a model-independent differential cross section measurement of this process on carbon by selecting events with a muon and a pion, no evidence of nuclear break-up, and small momentum transfer to the nucleus $\vert t \vert$. A similar process which is a background to the measurement on carbon is diffractive pion production off the free protons in MINERvA's scintillator. This process is not modeled in the neutrino event generator GENIE. At low $\vert t \vert$ these events have a similar final state to the aforementioned process. A study to quantify this diffractive event contribution to the background is done by emulating these diffractive events by reweighting all other GENIE-generated background events to the predicted $\vert t \vert$ distribution of diffractive events, and then scaling to the diffractive cross section. [Preview Abstract] |
Sunday, April 12, 2015 9:54AM - 10:06AM |
H7.00008: ABSTRACT WITHDRAWN |
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