Bulletin of the American Physical Society
APS April Meeting 2022
Volume 67, Number 6
Saturday–Tuesday, April 9–12, 2022; New York
Session L08: Neutrino Instrumentation IIRecordings Available
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Sponsoring Units: DPF Chair: Shiqi Yu, Michigan State University Room: Juilliard |
Sunday, April 10, 2022 3:45PM - 3:57PM |
L08.00001: Latest 3-flavor neutrino oscillations results from the NOvA experiment Steven Calvez NOvA is a long-baseline neutrino oscillation experiment. Neutrinos produced by the 850 kW NuMI beam are detected by a Near Detector, located at Fermilab, and a much larger 14 kton Far Detector, located 810 km away. These massive tracking calorimeters are designed to detect and identify muon and electron neutrino interactions with high efficiency. Measuring the electron neutrino and antineutrino appearance rates, as well as the muon neutrino and antineutrino disappearance rates, allows us to constrain the neutrino oscillations parameters. By combining both neutrino data (13.6×1020POT) and antineutrino data (12.5×1020POT), NOvA was able to measure the mixing angle θ23 and the mass splitting Δm232 with high precision. Ongoing measurements will help NOvA further constrain the neutrino mass ordering and the CP-violating phase δCP. |
Sunday, April 10, 2022 3:57PM - 4:09PM |
L08.00002: Measurement of Neutral Current π0 Cross Section on Argon in MicroBooNE Nupur Oza MicroBooNE is a short-baseline neutrino oscillation experiment located on the Booster Neutrino Beam at Fermilab. MicroBooNE’s primary goal is to investigate the anomalous excess of low energy events in MicroBooNE’s predecessor, MiniBooNE, which could be attributed to electron-like or photon-like signals. To test the photon-like hypothesis, MicroBooNE has performed the first search for single photon events, a likely source of which is the neutral current (NC) Δ radiative decay. NC π0 production is the dominant background for this search because mis-reconstructed photon showers from π0 decay mimic single photon events. Calculating the NC π0 cross section will improve the modeling of this background channel, reducing uncertainties in measuring single photon production processes in MicroBooNE. In this talk, I will report the first measurement of the NC π0 cross section for neutrino-argon interactions at O(1GeV) energies. I will present the NC π0 signal selection criteria adapted from the single-photon search, the methodology for calculating the cross section measurement, and the resulting NC π0 cross-section in argon. |
Sunday, April 10, 2022 4:09PM - 4:21PM |
L08.00003: Neutrino Tridents in the NOvA Near Detector Reed Bowles NOvA is a long-baseline accelerator-based neutrino oscillation experiment that uses the NuMI beam from Fermilab to measure electron-neutrino appearance and muon-neutrino disappearance using a near detector, located at Fermilab, and a far detector, located in Ash River, Minnesota. The high flux of muon neutrinos at the near detector allows for measurement of rare processes such as neutrino trident scattering, a rare Standard Model process in which a charged-lepton pair is produced via neutrino-nucleus scattering. Differences in event topology between the dimuon, the trident channel where the outgoing leptons are a muon and antimuon, and other muon neutrino charged current interactions necessitate developing reconstruction algorithms specific to these events. In this talk, we will discuss the estimated event rate for dimuons in the NOvA Near Detector and techniques developed to reconstruct and identify dimuons. |
Sunday, April 10, 2022 4:21PM - 4:33PM |
L08.00004: Status of muon antineutrino charged-current neutral-pion production differential cross-section measurement in the NOvA near detector Fan Gao NOvA is a long-baseline neutrino oscillation experiment primarily designed to measure the muon (anti)neutrino disappearance and electron (anti)neutrino appearance in the off-axis Fermilab NuMI beam. It uses two functionally identical liquid scintillator detectors separated by 810 km and a narrow band beam centered around 2 GeV. Energetic neutral pions produced in Δ resonance and deep-inelastic interactions are a significant background to the electron (anti)neutrino appearance measurement as the photons coming from neutral pion decay may be misidentified as an electron(positron). The high statistics antineutrino mode data in the near detector (ND) can be used to perform a measurement of the cross-section for muon antineutrino charged-current (CC) neutral-pion production. The analysis uses a convolutional neural network (CNN) trained on individually simulated particles to identify neutral pions in the final state. The status of the analysis and preliminary sensitivities will be presented. |
Sunday, April 10, 2022 4:33PM - 4:45PM |
L08.00005: Searches for Coherent Single-photon Production and BSM e+e- Production with MicroBooNE’s Pandora-based Single-Photon Search Guanqun Ge MicroBooNE is an 85 ton active volume liquid argon time projection chamber with excellent spatial and calorimetric resolution, whose primary physics goals include the investigation of the MiniBooNE low-energy excess. Recent MicroBooNE results, using two exclusive final state selections of 1 photon and 1 proton and of 1 photon and no other visible final state activity, have disfavored the possibility of an excess in the neutral current Delta radiative decay channel at Booster Neutrino Beam energies—one of the dominant single-photon backgrounds in the MiniBooNE measurement in need of a direct constraint. MicroBooNE's result is driven primarily by the 1 photon and 1 proton selection, which leverages kinematics for significant background reduction. This talk examines the 1 photon and no other visible final state activity selection more closely, where additional background reduction enables searches for other rare “single-photon” processes, such as neutral current coherent single-photon production or beyond-Standard Model physics which predict boosted e+e- production. |
Sunday, April 10, 2022 4:45PM - 4:57PM |
L08.00006: Single Photon Search in MicroBooNE Using Wire-Cell 3D Reconstruction Algorithms Lee Hagaman The MicroBooNE experiment is an 85 ton active volume liquid argon time projection chamber in the Booster Neutrino Beam at Fermilab. MicroBooNE was designed to investigate the low energy excess of electromagnetic events observed by the MiniBooNE experiment. Recent MicroBooNE results disfavor an electron neutrino hypothesis for this excess, leaving neutrino events which produce a single photon as one of the most compelling explanations for the anomaly. MicroBooNE has investigated single photons using Pandora reconstruction, and has disfavored a large excess of neutral current delta radiative decays, primarily by examining events with one photon and one proton. In this talk, I will describe progress towards a new single photon investigation in MicroBooNE using Wire-Cell 3D reconstruction algorithms, which will make a largely independent second measurement of neutral current delta radiative decays. This new analysis will also allow a closer look into events with a single photon shower and no hadronic activity, a topology which has particularly challenging backgrounds, and which is predicted by a variety of beyond-the-standard-model theories. |
Sunday, April 10, 2022 4:57PM - 5:09PM |
L08.00007: Status of the muon neutrino cross-section measurement using the off-axis NuMI beam at the ICARUS detector. Jaesung Kim The ICARUS detector, a Liquid Argon Time Projection Chamber, will serve as the Far Detector of the short-baseline neutrino program using the Booster beamline at Fermilab. It is a 103 mrad off-axis of the NuMI beamline. Prospects for muon neutrino cross-section measurements will be shown. We present the muon neutrino event selection with Monte Carlo, the selection efficiency is measured from the Monte Carlo estimation using the GENIE event generator interfaced with GEANT4 simulation. The status of the commissioning data will be presented. |
Sunday, April 10, 2022 5:09PM - 5:21PM |
L08.00008: An Inclusive Single Photon Analysis in MicroBooNE Erin H Yandel One of the main goals for the MicroBooNE detector at Fermilab is to investigate the “low energy excess” (LEE) of electromagnetic events observed by the MiniBooNE experiment. In MicroBooNE’s first round of LEE results, no excess was seen in events with a single electron-like electromagnetic shower in the final state. Unlike these electron LEE analyses, which cover a wide range of final states and possible processes, the only currently released single photon-like LEE result focuses on NC ?? to one photon decays, with either exactly one or zero protons in the final state, which also shows no excess. Given these results, a more general analysis of photon-like events is needed to complete a full investigation of the MiniBooNE anomaly. This talk presents the first look at a model-independent analysis searching for a MiniBooNE LEE-like signal in the inclusive single photon channel with MicroBooNE. The signal events are defined by a final state topology with one photon shower, no primary electron showers, and anything else. The performance of the signal selection, which uses Wire Cell event reconstruction, will be shown. |
Sunday, April 10, 2022 5:21PM - 5:33PM |
L08.00009: Measurement of Nuclear Dependence in Inclusive Antineutrino Scattering with MINERvA Anezka Klustova MINERvA presents the current progress on its first inclusive charged-current analysis of antineutrino interactions on iron, lead, and water using antineutrino energy and Bjorken x. The interactions on carbon and hydrocarbon are also reported. The results use data produced in the NuMI beamline with antineutrino beam peak energy of approximately 6 GeV. The measurements utilize events of energies 2 < E < 50 GeV. The event selection and the background prediction related to the complex structure of the target region and machine-learning reconstruction of the interaction vertex are presented. The importance of the Bjorken x variable to investigate nuclear modifications and the challenges of unfolding in x are discussed. The analysis will provide high-statistics, self-contained studies of nuclear effects and nuclear dependence, and comparisons to the current neutrino interaction generators such as GENIE. |
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