Bulletin of the American Physical Society
2021 Fall Meeting of the APS Division of Nuclear Physics
Volume 66, Number 8
Monday–Thursday, October 11–14, 2021; Virtual; Eastern Daylight Time
Session EB: Mini-Symposium: Neutrinos and Nuclei III: Neutrino Scattering I |
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Chair: Emanuele Mereghetti, LANL Room: Statler |
Tuesday, October 12, 2021 11:45AM - 11:57AM |
EB.00001: Towards lattice QCD inputs for neutrino-nucleus scattering Michael L Wagman Next-generation neutrino oscillation experiments will require precise knowledge of neutrino-nucleus cross sections to achieve precise measurements of neutrino oscillation parameters. Lattice QCD can be used to calculate nuclear matrix elements relevant for describing electroweak interactions across a range of energies. I will discuss recent progress in lattice QCD calculations of the energy spectrum and matrix elements of light nuclei, in particular variational methods for controlling important systematic uncertainties arising from excited-state effects. |
Tuesday, October 12, 2021 11:57AM - 12:09PM |
EB.00002: Nucleon Axial Form Factor for Neutrino Oscillation from Lattice QCD Aaron Meyer Next generation neutrino oscillation experiments are poised to answer key questions about the nature of the neutrino. The axial form factor is a vital ingredient in the nucleon amplitudes used to predict quasielastic scattering, the primary signal measurement process for DUNE, yet the form factor uncertainty is vastly underestimated by the dipole parameterization and a model independent parameterization is not well constrained by elementary target data. Lattice QCD has the ability to make significant impact upon neutrino oscillation experiments by computing, from first principles, the interaction of a nucleon with a weak current in the absence of a nuclear medium. Results from these LQCD calculations can significantly reduce the uncertainty for nucleon amplitudes and assign a robust, systematically-improvable error budget. Recent calculations of the nucleon axial charge have demonstrated that sub-percent precision is possible on this vital quantity. In this talk, I will discuss preliminary results for the Callat collaboration's calculation of the axial form factor of the nucleon and outline the path toward achieving a result with a complete error budget. Results from LQCD will permit more complete factorization of uncertainties from nucleon and nuclear sources. |
Tuesday, October 12, 2021 12:09PM - 12:21PM |
EB.00003: First Measurement of Differential Charged Current Quasielastic–like νµ–Argon Scattering Cross Sections with the MicroBoone Detector Adi Ashkenazi, Afroditi Papadopoulou The extraction of neutrino mixing parameters from neutrino oscillation experiments relies on the reconstruction of the incident neutrino energy and knowledge of the neutrino-nuclei interaction cross-section. Charged Current Quasi Elastic (CCQE) scattering, in which the incoming neutrino knocks out a nucleon and leaves the rest of the nucleus intact, is the simplest inelastic interaction process. The incoming energy reconstruction for this type of process is also considered relatively simple. Thus it is chosen by many accelerator based neutrino experiments as their signal or a dominant portion of it. |
Tuesday, October 12, 2021 12:21PM - 12:33PM |
EB.00004: Towards $1\mu 1p$ Single Transverse Variable Cross Sections in $\mu$BooNE Joshua L Barrow, Afroditi Papadopoulou Current and future generation neutrino oscillation experiments aim towards a high-precision measurement of neutrino oscillation parameters. To do so requires an unprecedented understanding of neutrino-nucleus scattering and an excellent reconstruction of the incoming neutrino energy. In this work, we utilize variables characterising kinematic imbalances in the plane transverse to an incoming neutrino, thus acting as a direct probe of nuclear effects such as final state interactions, Fermi motion, and nucleon-nucleon correlations. We present our progress towards the first charged current differential cross-section with no final state pions and a single final state proton in these variables using data recorded by the MicroBooNE LArTPC detector. These measurements will permit the community to better understand the impact of nuclear effects on observables useful to neutrino scattering, providing valuable constraints on the systematic uncertainties associated with neutrino oscillation and scattering measurements both in near future experiments such as the Short Baseline Neutrino Program as well as forthcoming experiments such as DUNE. |
Tuesday, October 12, 2021 12:33PM - 12:45PM |
EB.00005: Electron-Nucleus Scattering Constraints For Neutrino Interactions And Oscillations Afroditi Papadopoulou The ability of current and next generation accelerator-based neutrino-oscillation measurements to reach their desired sensitivity requires a detailed understanding of neutrino-nucleus interactions. These include precise knowledge of the relevant cross sections and of our ability to reconstruct the incident neutrino energy from the measured final state particles. Incomplete understanding of these interactions can skew the reconstructed neutrino spectrum and therefore bias the extraction of fundamental oscillation parameters. In this talk, I will present new wide phase-space electron-nucleus scattering data, collected using the decommissioned CLAS6 spectrometer at the Thomas Jefferson National Accelerator Facility (JLab), where we studied how well we can reconstruct the incident lepton energy from the measured final state particles. Disagreements with the commonly used GENIE event generator are observed, indicating a potential bias for future oscillation analyses and pointing the way for improving these event generators. |
Tuesday, October 12, 2021 12:45PM - 12:57PM |
EB.00006: Latest Results and Status of CEvNS on LAr from the COHERENT Collaboration Benjamin D Suh Coherent Elastic Neutrino-Nucleus Scattering(CEvNS), first observed by the COHERENT Collaboration in 2017, is a neutral-current neutrino process. For neutrino energies below 100MeV, it is the dominant cross-section. A precise measurement of the CEvNS cross-section will test new physics including constraints on nonstandard neutrino-quark interactions, the weak nuclear radius, and the particle nature of dark matter. In addition, development of CEvNS-sensitive technologies is useful for low-threshold WIMP dark matter searches and for sterile neutrino searches. |
Tuesday, October 12, 2021 12:57PM - 1:09PM |
EB.00007: Measurement of COHERENT Elastic Neutrino Nucleus Scattering with Germanium at the SNS JAMES L BROWNING The COHERENT Collaboration, which has previously made the world’s |
Tuesday, October 12, 2021 1:09PM - 1:21PM |
EB.00008: Neutrino-Nucleus Scattering Studies with the COHERENT Multi-ton NaI Array Diane M Markoff A modular NaI[Tl] scintillation crystal detector array is designed to measure coherent elastic neutrino-nucleus scattering (CEvNS) and charged current interactions as part of the suite of COHERENT collaboration detectors deployed at the Spallation Neutron Source at the Oak Ridge National Laboratory. A CEvNS measurement on 23Na will provide the smallest neutron number (N) result and when combined with cesium and argon measurements and a future germanium value, will test the expected standard model dependence of the cross section on N2. The measured functional dependence of the cross section on N2 will provide information on the form factor deviations from unity used in the calculations. Simulation studies on 7 modules with ~3.4 tons of NaI indicates a significance of about 3σ per year for a counting experiment on 23Na. The detector design allows for a simultaneous measurement of the charged current, electron neutrino, inelastic scattering cross section on 127I that is sensitive to quenching of the gA coupling strength in weak processes with momentum transfer ~ 30 MeV and relevant to neutrinoless double beta decay calculations. The physics program, design, deployment status and tests of the initial 5-module array will be presented. |
Tuesday, October 12, 2021 1:21PM - 1:33PM |
EB.00009: Design of low Tc TES chips as sensors for low background calorimeter arrays in neutrino physics Ran Chen, Enectali Figueroa, Clarence L Chang, Benjamin Schmidt
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