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 D18: Neutrino Oscillations ILive
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Sponsoring Units: DPF Chair: Michael Wilking, StoneyBrook |
Saturday, April 17, 2021 1:30PM - 1:42PM Live |
D18.00001: Recent Results from the Daya Bay Experiment Olivia Dalager This talk will provide an overview of the latest results from the Daya Bay experiment, which is one of the leading experiments to study electron antineutrinos produced in nuclear reactors. Daya Bay has collected unprecedented statistics of nearly 4 million $\bar\nu_e$ inverse beta decay candidates over 1958 days of operation, with an additional 3 years of data under analysis. Eight functionally identical detectors in three experimental sites at different baselines from adjacent reactor cores allowed for the world's most precise measurement of the $\theta_{13}$ mixing angle. Together with the MINOS/MINOS+ and Bugey-3 experiments, Daya Bay searched for light sterile neutrino signatures. No signal was observed and the most stringent limits to date were set on the $\theta_{\mu e}$ mixing angle over five orders of magnitude in the sterile mass-squared difference $\Delta m^2_{41}$, largely excluding the sterile-neutrino parameter space allowed by the LSND and MiniBooNE experiments. The large data sample made possible an extraction of the isotopic reactor $\bar\nu_e$ energy spectra from ${}^{235}$U and ${}^{239}$Pu, a first with commercial reactors. The status of a new analysis providing a model-independent, data-driven method to predict the antineutrino spectrum will also be reported. [Preview Abstract] |
Saturday, April 17, 2021 1:42PM - 1:54PM Live |
D18.00002: Latest Long-baseline Oscillation Results from NOvA Combining Neutrino and Antineutrino Data Andrew Sutton NOvA is a long-baseline off-axis accelerator neutrino experiment utilizing the NuMI beam produced at Fermilab to address outstanding questions in neutrino physics. By measuring muon neutrino disappearance and electron neutrino appearance between the Near Detector at Fermilab and the 14 kiloton Far Detector in Ash River, Minnesota the experiment is able to make precision measurements of the oscillation paramters $\theta_{23}$ and $\Delta m^2_{32}$. Additionally, NOvA can probe the neutrino mass hierarchy and the existence of leptonic CP violation. This talk will present the latest 3-flavor oscillation results from NOvA which include updated simulation, reconstruction, and analysis tools and combines neutrino and antineutrino data with approximately $13 \times 10^{20}$ protons-on-target of beam exposure in each mode. [Preview Abstract] |
Saturday, April 17, 2021 1:54PM - 2:06PM Live |
D18.00003: Systematic Uncertainties in the NOvA Oscillation Analysis Yibing Zhang NOvA is a long-baseline accelerator neutrino oscillation experiment using the NuMI neutrino beam at Fermilab. Its physics goals are probing the neutrino mass hierarchy, CP-violating phase $\delta_{cp}$ and octant of $\theta_{23}$ mixing angle by observing the $\nu_e$ appearance and $\nu_{\mu}$ disappearance signals. Two functionally identical detectors are placed off-axis from the centre of the NuMI beam. The near detector at Fermilab is 100 m underground, blocking a great number of cosmic rays, and the far detector located at Ash River, 810 km away from the beam source. Systematic uncertainties originating from beam flux, cross section, detector response, calibration, and other sources play a siginificant role in the NOvA analysis. This talk will present details of the systematic uncertainties and their effects on NOvA's latest precision measurements in both $\nu_e$ appearance and $\nu_{\mu}$ disappearance oscillation channels. [Preview Abstract] |
Saturday, April 17, 2021 2:06PM - 2:18PM Live |
D18.00004: Data-Driven Cross Checks for Electron Neutrino Selection Efficiency in NOvA Anna Hall NOvA is a long-baseline neutrino oscillation experiment, designed to make precision neutrino oscillation measurements using $\nu_{\mu}$ disappearance and $\nu_e$ appearance. It consists of two functionally equivalent detectors and utilizes the Fermilab NuMI neutrino beam. NOvA uses a convolutional neural network for particle identification of $\nu_e$ events in each detector. As part of the validation process of this classifier’s performance, we apply a data-driven technique called Muon Removal. In a Muon-Removed Electron-Added study we select $\nu_{\mu}$ charged current candidates from both data and simulation in our Near Detector and then replace the muon candidate with a simulated electron of the same energy. In a Muon-Removed Decay-in-Flight study we remove the muonic hits from events where cosmic muons entering the detector have decayed in flight, resulting in samples of pure electromagnetic showers. Each sample is then evaluated by our classifier to obtain selection efficiencies. Our recent analysis found agreement between the selection efficiencies of data and simulation within our uncertainties, showing that our classifier selection is generally robust in $\nu_e$ charged current signal selection. [Preview Abstract] |
Saturday, April 17, 2021 2:18PM - 2:30PM Live |
D18.00005: Neutrino Event Reconstruction using Instance Segmentation on NOvA Micah Groh The NOvA experiment is a long baseline neutrino oscillation experiment measuring neutrino oscillations and cross sections using the NuMI beam at Fermilab. Reconstructing particles produced in neutrino interactions provides the basis for neutrino energy estimation and final state identification for cross section measurements and interaction model tuning. This talk will present an end-to-end technique for reconstructing a neutrino interaction using instance segmentation based on Mask R-CNN. This technique simultaneously reconstructs particle hit clusters and classifies the particle identity. This has now been incorporated into NOvA’s analysis framework. On average, three additional particles are reconstructed per event and the average purity of clusters increases by 20%. [Preview Abstract] |
Saturday, April 17, 2021 2:30PM - 2:42PM Live |
D18.00006: Towards an Improved Mass Ordering Measurement With IceCube-DeepCore: Neutrino/Anti-Neutrino Discrimination Studies Sebastian Enrique Sanchez Herrera The neutrino mass ordering (NMO) is one of the remaining questions in the field of neutrino oscillations. The ordering is defined by the neutrino mass state with the lowest mixing to electron neutrinos. In the normal ordering (NO), this state is the heaviest, in inverted ordering (IO), it is the lightest. The IceCube neutrino observatory is a Cerenkov detector located at the south pole. Within, we can find DeepCore, a lower energy sub detector sensitive to atmospheric neutrino oscillations. As neutrinos traverse the Earth after production in cosmic ray showers in the atmosphere, they have different oscillation probabilities that depend on their energy and path lengths through the Earth. Inference of these probabilities under each mass ordering has been used in the past to measure the NMO with DeepCore, although sensitivities were low. High-energy Cherenkov detectors are usually not well suited to discriminate between neutrino and anti-neutrino populations and thus have limited sensitivity towards measuring the mass ordering. In this presentation I will show recent studies on a discrimination method between $\nu$ and $\bar{\nu}$ events in DeepCore that promises to yield a significant improvement in sensitivity [Preview Abstract] |
Saturday, April 17, 2021 2:42PM - 2:54PM Live |
D18.00007: Muon Momentum Estimation in ProtoDUNE Using Multiple Coulomb Scattering Hunter Meyer, Thomas Kutter The Deep Underground Neutrino Experiment (DUNE) is a long baseline neutrino experiment using liquid argon detectors to study neutrino oscillations, proton decay, and other phenomena. The single-phase ProtoDUNE detector is a prototype of the DUNE far detector and is located in a charged particle test beam at CERN. It is critical to have accurate momentum estimation of charged particles for calibration and testing of the ProtoDUNE detector performance, as well for proper analysis of DUNE data. Charged particles passing through matter undergo multiple Coulomb scattering (MCS). MCS is momentum-dependent, allowing it to be used in muon momentum estimation while allowing for momentum estimation of muons exiting the detector, a key benefit of MCS over various other methods. We will present the status of the MCS analysis which was developed and evaluated using Monte Carlo simulations and discuss the bias and resolution of our momentum estimation method, as well as its dependencies on the detector resolution. [Preview Abstract] |
Saturday, April 17, 2021 2:54PM - 3:06PM Live |
D18.00008: DUNE-PRISM: Electron Neutrino Channel Analysis Eran Moore Rea This work extends Deep Underground Neutrino Experiment (DUNE) Precision Reaction-Independent Spectrum Measurement (PRISM)\textsc{\char13}s oscillation analysis technique to the electron neutrino channel, which oscillates in a complementary manner to the muon channel. DUNE will consist of a Near Detector (ND) near the muon neutrino beam source and a Far Detector (FD) 800 miles away. The ND is on a movable axis perpendicular to the beamline. PRISM is a novel way to do long-baseline neutrino oscillation physics using DUNE’s moveable neutrino detector. This moveable ND allows PRISM to find linear combinations of ND muon neutrino fluxes that closely match an oscillated muon neutrino flux at the FD. The work in this talk will help correct for the difference in electron neutrino and muon neutrino cross-sections when applying PRISM’s analysis technique to the electron neutrinos. This will help the implementation of PRISM, eventually using DUNE’s off-axis feature to improve sensitivity and make more precise measurements of oscillation parameters. [Preview Abstract] |
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