Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session T17: Neutrinos III |
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Sponsoring Units: DPF Chair: Young-Kee Kim Room: Sheraton Grand Ballroom II |
Monday, April 15, 2019 3:30PM - 3:42PM |
T17.00001: Status of the Short-Baseline Near Detector at Fermilab Michael R Mooney, Ryan LaZur The Short-Baseline Near Detector (SBND) will be one of three liquid argon neutrino detectors sitting in the Booster Neutrino Beam (BNB) at Fermilab as part of the Short-Baseline Neutrino (SBN) Program. SBND is a 112-ton active mass liquid argon time projection chamber (LArTPC) to be located only 110 m from the BNB neutrino source. The detector is currently in the construction phase and is anticipated to begin operation in 2020. SBND will record over a million neutrino interactions per year; by providing such a high statistics measurement of the un-oscillated content of the BNB, SBND is a critical element in performing searches for neutrino oscillations at the Fermilab SBN Program. In this talk, the physics reach, current status, and future prospects of SBND are discussed. |
Monday, April 15, 2019 3:42PM - 3:54PM |
T17.00002: Charged and neutral pion production in the MINERνA experiment Gonzalo A Diaz Bautista MINERνA is a neutrino scattering experiment that uses the NuMI beamline with the goal of measuring neutrino-nucleus cross sections on different nuclei with high precision, as well as studying the internal structure of the nuclei of those materials. Charged and neutral pion production are significant since they represent a large fraction of the events that can be seen in our detector, are highly relevant to oscillation experiments like NOνA and DUNE, and are affected by the underlying structure of the target nuclei. I will present the current results on pion production measured by the MINERvA experiment using a neutrino beam of 3.6 GeV, and the plans for enhancing these cross section studies on different nuclei with a higher energy neutrino beam. |
Monday, April 15, 2019 3:54PM - 4:06PM |
T17.00003: Initial study of the Neutral Current Single π0 production in muon anti-neutrino interaction on water with the P0D Detector at T2K Shilin Liu The T2K experiment is a long-baseline neutrino oscillation experiment in Japan. It measures νμ appearance in νe beam and aims to measure the last lepton sector mixing angle θ13 and oscillation parameters θ23 and Δm232 . The experiment also search for sterile neutrino and measure neutrino cross section. The neutrino beam is generated at the J-PARC nuclear physics site in Tokai on the east coast of Japan and goes 295 km directly to Super-Kamiokande detector in Kamioka mine on the west coast. The Super-K is a water Cherenkov detector that can measure and distinguish νμ and νe. One of the main background in the Super-K when measuring neutrino is the Neutral Current Single π0 (NC1π0) interaction of the neutrino with water. The process is not well understood. In order to constrain this background, π0 Detector (P0D) is introduced in the near detector complex (ND280) located 280 meters downstream of the origin of beam. P0D has 50 water bags that can be filled and drained to give analyzers access to a mass subtraction to find on-water cross section. In this initial study, I will present the measurement of NC1π0 rate on-water with anti-νμ beam. The on-water rate will be obtained by comparing the interaction when the bags are filled with water and empty. |
Monday, April 15, 2019 4:06PM - 4:18PM |
T17.00004: First Oscillation Results Using Neutrinos and Antineutrinos from the NOvA Experiment Erica S Smith The NOvA experiment is a long-baseline neutrino oscillation experiment that uses the upgraded NuMI beam from Fermilab to detect both electron and muon flavored neutrinos in a Near Detector, located at Fermilab, and a Far Detector, located at Ash River, Minnesota. NOvA's primary physics goals include precision measurements of neutrino oscillation parameters, such as θ23 and the atmospheric mass-squared splitting, along with probes of the mass hierarchy and the CP violating phase. This talk will present the first NOvA results to use a combined neutrino and antineutrino data set, based on a neutrino beam exposure of 8.85E20 protons-on-target and an antineutrino beam exposure of 6.9E20 protons-on-target. |
Monday, April 15, 2019 4:18PM - 4:30PM |
T17.00005: $\nu_e$ signal selection and cross-checks performed using muon removed simulations and cosmic muon brem showers in NOvA Reddy Pratap Gandrajula NOvA is a long-baseline neutrino oscillations experiment, designed to make precision measurements of $\theta_{23}$, $\delta_{CP}$, and the neutrino mass hierarchy using $\nu_\mu(\bar{\nu_\mu})\rightarrow\nu_e(\bar\nu_e)$ neutrino oscillations. It consists of two functionally equivalent detectors each located 14.6 mrad off the central axis of the Fermilab NuMI neutrino beam; the world's most intense neutrino beam. The Near Detector(ND) is located 1 km downstream from the beam source, and the Far Detector(FD) is located 810 km away in Ash River, MN. To validate the performance of our simulation of the convolutional neural network classifier used to identify $\nu_{e}$ events, we apply a data-driven technique called Muon Removal (MR). This talk will discuss two applications of MR. In a Muon-Removed Electron-added (MRE) study, we compare the performance of the classifier on ND $\nu_{\mu}$ CC candidates from both data and simulation in which the muon candidate is replaced by a simulated electron of the same energy. In Muon-Removed Bremsstrahlung (MRBrem), we remove the muon from data & simulated FD cosmic muon rays, resulting in a pure selection of electromagnetic showers. The resulting comparisons show agreement at the few-percent level. |
Monday, April 15, 2019 4:30PM - 4:42PM |
T17.00006: Systematic Uncertainties for the NOvA Oscillation Analyses Micah Groh NOvA is a long baseline neutrino oscillation experiment using two functionally equivalent detectors to make precision neutrino oscillation measurements utilizing the NuMI beam at Fermilab. The two detectors are situated 14 mrad off the beam axis, one located at Fermilab and the second located 810 km away in Minnesota. NOvA observes the oscillation of neutrinos and anti-neutrinos over this 810 km baseline and measures the parameters associated with oscillations such as the neutrino mass hierarchy and the neutrino mass splitting and mixing in the 2-3 sector. Key to these measurements are an understanding and rigorous treatment of the systematic uncertainties from many sources: neutrino interaction modeling, detector calibration and response, flux uncertainty, and others. I will present details of the systematic uncertainties affecting NOvA and how these uncertainties are evaluated for NOvA’s latest joint electron and muon (anti)neutrino oscillation results. |
Monday, April 15, 2019 4:42PM - 4:54PM |
T17.00007: ProtoDUNE Proton Analysis Heng-Ye Liao, Glenn Horton-Smith, Tingjun Yang Recent neutrino oscillation experiments have ushered in a new era with precision measurements employed in the search for CP violation and mass hierarchy. Charged-current (CC) interactions are the primary detection channels for neutrino oscillation experiments. Protons are one of the final state particles in neutrino CC interactions such as CC quasi-elastic (CCQE) and CC resonance (CCRES) interactions, and hence they play an essential role in reconstructing the neutrino total energy in the interactions. |
Monday, April 15, 2019 4:54PM - 5:06PM |
T17.00008: Measurement of 8B Solar Neutrino Flux in the SNO+ Water Phase Eric Marzec Neutrinos are produced in the core of the Sun through a variety of nuclear reactions. The 8B β+ decay dominates the high energy portion of the solar neutrino spectrum. SNO+ has made a measurement of the 8B solar neutrino flux using a water target. I describe here that measurement and the outlook for future solar neutrino measurements in SNO+. |
Monday, April 15, 2019 5:06PM - 5:18PM |
T17.00009: Reconstruction Techniques used in the NOvA Experiment Nitish Nayak NOvA is a long-baseline neutrino oscillation experiment that is designed to probe the neutrino mass hierarchy and mixing structure. It uses two functionally identical liquid scintillator detectors 14mrad off-axis from the NuMI beamline at Fermilab, allowing for a tightly focused neutrino flux peaked at around 2 GeV. The world-leading intensity of the NuMI beamline, over 700 kW, along with the very high cosmic background rate at its on-surface Far Detector, pose unique challenges in reconstructing single neutrino events separated from other physics interactions in the detector environment. Furthermore, one needs to estimate the energies and momenta of the products from neutrino interactions with high enough resolutions in order to measure oscillation parameters with high precision. To do this, NOvA leverages the detectors' excellent timing and spatial resolutions and employs a wide suite of techniques, both kinematic and deep-learning based, to reconstruct important physics information. In this talk, I will provide an overview of the reconstruction algorithms used in NOvA to address these and many other challenges. |
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