Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session H13: Accelerator Neutrinos ILive
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Sponsoring Units: DNP Chair: Joe Carlson, LANL |
Sunday, April 18, 2021 10:45AM - 10:57AM Live |
H13.00001: Charged Current Electron Neutrino Event Selection in MicroBooNE Based on Wire-Cell 3D Reconstruction Algorithms Lee Hagaman MicroBooNE is an 85 ton active volume liquid argon time projection chamber in the Booster Neutrino Beam at Fermilab. One of MicroBooNE's major physics goals is to investigate short baseline neutrino oscillations, primarily the low energy excess of electromagnetic events observed by the MiniBooNE experiment. The challenging task of identifying electron neutrino events among many backgrounds is essential for this oscillation analysis. In this talk, I will describe the charged current electron neutrino event selection we have developed using Wire-Cell 3D reconstruction algorithms, which build a 3D image of an event from 2D projections produced by the detector. We use 3D pattern recognition algorithms and machine learning techniques to reject various types of backgrounds and achieve a high efficiency and high purity selection. [Preview Abstract] |
Sunday, April 18, 2021 10:57AM - 11:09AM Live |
H13.00002: Charged-Current Electron-Neutrino Low Energy Excess Search with Wire-Cell reconstruction paradigm in MicroBooNE Jay Hyun Jo The single-phase liquid argon time projection chamber (LArTPC) provides a large amount of detailed information in the form of fine-grained ionization electron signals from particle traces. The MicroBooNE detector has 85 tons of liquid argon active mass and is located along the Booster Neutrino Beam (BNB) at Fermilab. MicroBooNE was build to primarily investigate the low energy excess (LEE) of electron neutrino and antineutrino charged current quasi-elastic events observed in the MiniBooNE experiment. Wire-Cell is a novel tomographic event reconstruction paradigm for LArTPCs, which reconstructs topology-agnostic 3D space points based on multiple 2D projected views of the TPC activity by reducing ambiguity from anode wire readout. In this talk, a sensitivity study of LEE search with the Wire-Cell reconstruction will be presented. A cross-check of the Wire-Cell LEE analysis using artificially-generated pseudo-datasets will also be discussed. [Preview Abstract] |
Sunday, April 18, 2021 11:09AM - 11:21AM Live |
H13.00003: Constraining the Neutral Current $\pi^0$ Background for MicroBooNE's Single-Photon Search Andrew Mogan Liquid Argon Time Projection Chambers (LArTPCs) are an important technology in the field of experimental neutrino physics due to their exceptional calorimetric and position resolution capabilities. In particular, their ability to distinguish electrons from photons is crucial for current and future neutrino oscillation experiments. The MicroBooNE experiment is utilizing LArTPC technology to investigate the MiniBooNE low-energy excess, which could be either electron-like or photon-like in nature. To test the photon-like hypothesis, MicroBooNE is searching for single-photon events, a likely source of which is the neutral current (NC) $\Delta$ radiative decay. However, this search is complicated by the significantly more common neutrino-induced NC resonant $\pi^0$ production process. This talk presents the method for adapting the single-photon selection framework to select two-photon events which are characteristic of the NC $\pi^0$ topology. The NC $\pi^0$ selected sample is then used to constrain the systematic uncertainty on the NC $\Delta$ radiative decay measurement. [Preview Abstract] |
Sunday, April 18, 2021 11:21AM - 11:33AM Live |
H13.00004: Measurement of Pion-Argon Absorption and Charge Exchange using ProtoDUNE-SP Jacob Calcutt ProtoDUNE-SP is the largest Liquid Argon Time Projection Chamber (LArTPC) to have operated, and serves as both a source of data for charged-particle interactions and a prototype for the single phase far detector module of the future Deep Underground Neutrino Experiment (DUNE). The detector was commissioned in Fall 2018, with test beam data taken immediately after that before the CERN Long Shutdown 2. The test beam consisted of hadrons (protons, positive pions and kaons) and muons in the momentum range of 1 - 7 GeV/c and electrons in the range of .3 - 7 GeV/c. The pion data from the test beam is of particular interest for DUNE in the context of both its neutrino interaction model and detector model. There is currently very limited data of pion-Ar interactions. As such, the ProtoDUNE-SP pion data will provide necessary constraints to DUNE's experimental simulation. This talk will show progress on measurements of pion-argon absorption and charge exchange at ProtoDUNE-SP. [Preview Abstract] |
Sunday, April 18, 2021 11:33AM - 11:45AM Live |
H13.00005: Status and Advances of the DUNE External Calibration Systems Mattia Fani The Deep Underground Neutrino Experiment (DUNE) is the next generation long-baseline experiment for neutrino physics. DUNE will measure the oscillation probabilities of neutrinos and antineutrinos at unprecedented precision to quantify the Charge-Parity (CP) violation effects in the leptonic sector and shed light on the matter-antimatter asymmetry in the universe. An ambitious scientific programme for the largest LArTPC detectors ever built, such as the DUNE Far Detector (FD) modules, requires outstanding detector performances and measurement precision. In particular, the DUNE Ionization Laser system (IoLS) will provide fine-grained measurements of drift velocity and electric field distortions, help diagnose detector defects such as cathode segment misalignments or field cage resistor failures, and most likely be able to make energy-based measurements. In this talk, I will introduce the calibration needs for the DUNE-FD and provide an overview of the external calibration systems planned in order to achieve the physics goals of DUNE. I will briefly talk about the status of various calibration systems with a focus on the DUNE-IoLS and present the latest updates. [Preview Abstract] |
Sunday, April 18, 2021 11:45AM - 11:57AM Live |
H13.00006: Optimizing the two detector method on NOvA 3-flavor oscillation analysis 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 $14.6$mrad off-axis from the NuMI beamline at Fermilab, allowing a tightly focused neutrino flux peaked at around 2 GeV. The Near Detector is located 100m underground and is used to characterize the neutrino and anti-neutrino beams before oscillations. The Far Detector is placed at a distance of $810$ km from the beam source and is used to look for neutrino oscillations, primarily in the $\nu_{\mu}$ $\rightarrow$ $\nu_{\mu}$ and the $\nu_{\mu}$ $\rightarrow$ $\nu_{e}$ channels and their anti-neutrino counterparts. The Far Detector lies on surface and as a result collects cosmic backgrounds at a rate of $\sim 10$ kHz. In this talk, I will describe techniques used in the oscillation analysis to minimize the statistical and systematic errors in the measurement of the oscillation parameters. These take the form of improved methods to both selecting the signal in the two channels as well as constraining the Far Detector neutrino data using the Near Detector. [Preview Abstract] |
Sunday, April 18, 2021 11:57AM - 12:09PM Live |
H13.00007: Statistical Treatment of Wire-Cell Low Energy Excess Search at MicroBooNE Kaicheng Li MicroBooNE is a 85 metric ton active volume single-phase Liquid Argon Time Projection Chamber (LArTPC) experiment at Fermilab. One of the main scientific goals of MicroBooNE is to investigate the low energy excess (LEE) of electron neutrino events observed by the MiniBooNE experiment. Wire-Cell, which started as a novel LArTPC tomographic event reconstruction method, has developed into a full analysis chain. This talk will describe the statistical treatment used in the Wire-Cell LEE search, covering methods for estimating systematic uncertainty, as well the choice of test statistics and related statistical procedures for estimating LEE sensitivity and significance level. [Preview Abstract] |
Sunday, April 18, 2021 12:09PM - 12:21PM Live |
H13.00008: Identification and Reconstruction of Michel electrons in ProtoDUNE-SP Aleena Rafique The Deep Underground Neutrino Experiment (DUNE) is a cutting-edge experiment for neutrino science and proton decay studies.~The single-phase liquid argon prototype detector at CERN (ProtoDUNE-SP) is a crucial milestone for DUNE that will inform the construction and operation of the first, and possibly subsequent 17-kt DUNE far detector modules. Michel electrons are distributed uniformly inside the detector and serve as a natural and powerful sample to study the detector's response for low-energy (tens of MeV) interactions as a function of position. I will present the current status of reconstructing Michel electrons from the decays of cosmic-ray muons in the ProtoDUNE-SP detector. We have developed selection tools to identify and reconstruct such Michel electrons which could benefit any LArTPC experiment generically. [Preview Abstract] |
Sunday, April 18, 2021 12:21PM - 12:33PM On Demand |
H13.00009: Overview of the DUNE Near Detector Lane Kashur The Deep Underground Neutrino Experiment (DUNE) is an upcoming long-baseline neutrino experiment which aims to answer fundamental questions about the universe by studying neutrino oscillations. Neutrino oscillations will occur as the neutrinos travel from Fermilab to a far detector 1300 km away consisting of underground liquid argon time projection chambers (LArTPCs). Prior to oscillation, these neutrinos will first encounter the DUNE near detector (ND). The DUNE ND will be located on-site at Fermilab, and will be used to provide an initial characterization of the neutrino beam, as well as to constrain systematic uncertainties on neutrino oscillation measurements. The detector configuration described by the DUNE ND Conceptual Design Report consists of a modular 50-ton LArTPC (ND-LAr), a magnetized 1-ton gaseous argon time projection chamber (ND-GAr), and an 8-ton plastic scintillator spectral beam monitor known as the System for on-Axis Neutrino Detection (SAND). In this talk, these detectors will be discussed in detail, in addition to their role in enabling the DUNE ND to fulfill its purpose within the broader experiment. [Preview Abstract] |
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