Bulletin of the American Physical Society
APS April Meeting 2017
Volume 62, Number 1
Saturday–Tuesday, January 28–31, 2017; Washington, DC
Session Y9: Neutrino IVFocus
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Sponsoring Units: DPF Chair: A. Himmel, FermiLab Room: Roosevelt 1 |
Tuesday, January 31, 2017 1:30PM - 2:06PM |
Y9.00001: Searching for Dark Matter using the NOvA upward-going muon trigger Invited Speaker: Cristiana Principato The NOvA collaboration has constructed a 14,000 ton, fine-grained, low-Z, total absorption tracking calorimeter at an off-axis angle to an upgraded NuMI neutrino beam. This detector, with its excellent granularity and energy resolution and relatively low-energy neutrino thresholds, was designed to observe electron neutrino appearance in a muon neutrino beam, but it also has unique capabilities suitable for more exotic efforts. In fact, if sufficient cosmic ray background rejection can be demonstrated, NO$\nu $A will be capable of a competitive indirect dark matter search for low-mass Weakly-Interacting Massive Particles (WIMPs). The cosmic ray muon rate at the NO$\nu $A far detector is approximately 100 kHz and provides the primary challenge for triggering and optimizing such a search analysis. ~We present the first dark matter search results using the full dataset collected with the upward-going muon trigger. ~ [Preview Abstract] |
Tuesday, January 31, 2017 2:06PM - 2:18PM |
Y9.00002: Muon Momentum Determination with Multiple Coulomb Scattering for the MicroBooNE Experiment Polina Abratenko MicroBooNE is an experiment based at Fermilab that uses a Liquid Argon Time Projection Chamber (LArTPC) to investigate the excess of low energy events observed by the MiniBooNE experiment, study neutrino-argon cross-sections, and perform R\&D for future LArTPC devices. MicroBooNE relies on the reconstruction of neutrino-induced muons for neutrino energy determination. However, a significant fraction of muons escape the detector. This talk describes a method for determining the momenta of escaping muons in LArTPC-based detectors. The technique uses information from multiple coulomb scattering to compute a muon’s momentum through the maximization of a likelihood algorithm. This method was applied to both simulation and data, with momentum resolutions for both measured to be around 20\% at typical MicroBooNE energies. Given this, multiple coulomb scattering provides a promising route towards energy determination for muons that escape the detector, and allows MicroBooNE to fully reconstruct and study uncontained, often high energy, events from both the Booster and NuMI neutrino beams. I will present the status and performance of the algorithm applied to simulation and data. [Preview Abstract] |
Tuesday, January 31, 2017 2:18PM - 2:30PM |
Y9.00003: Stability Training for Convolutional Neural Nets in LArTPC Matt Lindsay, Taritree Wongjirad Convolutional Neural Nets (CNNs) are the state of the art for many problems in computer vision and are a promising method for classifying interactions in Liquid Argon Time Projection Chambers (LArTPCs) used in neutrino oscillation experiments. Despite the good performance of CNN's, they are not without drawbacks, chief among them is vulnerability to noise and small perturbations to the input. One solution to this problem is a modification to the learning process called Stability Training developed by Zheng et al. ~We verify existing work and demonstrate volatility caused by simple Gaussian noise and also that the volatility can be nearly eliminated with Stability Training. We then go further and show that a traditional CNN is also vulnerable to realistic experimental noise and that a stability trained CNN remains accurate despite noise. This further adds to the optimism for CNNs for work in LArTPCs and other applications. [Preview Abstract] |
Tuesday, January 31, 2017 2:30PM - 2:42PM |
Y9.00004: New $\nu_{\mu}$ Disappearance Results with IceCube/Deepcore Joshua Hignight Located at the South Pole Station in Antarctica, the IceCube Neutrino Observatory is the world's largest neutrino telescope. In the clearest part of the ice sits a more densely instrumented section, DeepCore, that is able to measure neutrinos from 10-80 GeV. Using DeepCore, neutrino oscillations can be observed via $\nu_{\mu}$ disappearance. This talk will highlight the new and greatly improved atmospheric disappearance results from IceCube/DeepCore. [Preview Abstract] |
Tuesday, January 31, 2017 2:42PM - 2:54PM |
Y9.00005: ABSTRACT WITHDRAWN |
Tuesday, January 31, 2017 2:54PM - 3:06PM |
Y9.00006: Current Analysis Status for the Inclusive Neutral Current $\pi^{0}$ Production Cross section Measurement with the NOvA Near Detector Daisy Kalra, Giulia Brunetti NOvA (NuMI Off-axis $\nu_{e}$ Appearance) experiment is designed to study long-baseline neutrino oscillations. It uses two detectors, the Near Detector (ND) at Fermilab and the Far Detector (FD) at a distance 810 km in Northern Minnesota. NOvA looks for the $\nu_{e}$ appearance at the FD using a narrow band $\nu_{\mu}$ beam peaked at 2 GeV in energy. Neutral Current (NC) interactions with a $\pi^{0}$ in the final state represents the main background in the $\nu_{e}$ appearance measurement. The $\pi^{0}$ decay into two photons can fake the $\nu_{e}$ appearance either due to merging of two photon showers or one of the two photons escaping the detection. Therefore, a complete understanding of $\nu_{\mu}$ induced NC interactions with a $\pi^{0}$ in the final state is very important. It will also help in reducing the background uncertainties for current and future long-baseline neutrino oscillation experiments. We will present the status of the analysis related to the inclusive NC $\pi^{0}$ production cross section measurement with the NOvA ND. [Preview Abstract] |
Tuesday, January 31, 2017 3:06PM - 3:18PM |
Y9.00007: Measurements of Beam Cooling in Muon Ionization Cooling Experiment Tanaz Mohayai, Pavel Snopok, Chris Rogers, David Neuffer Cooled muon beams are essential for production of high-flux neutrino beams at the Neutrino Factory and high luminosity muon beams at the Muon Collider. The international Muon Ionization Cooling Experiment, MICE aims to demonstrate muon beam cooling through ionization energy loss of muons in material. The standard figure of merit for cooling in MICE is the transverse RMS emittance reduction and to measure this, the individual muon positions and momenta are reconstructed using scintillating-fiber tracking detectors, before and after a low-Z absorbing material. In this study, in addition to a preview on the standard measurement technique, an alternative technique is described, which is the measurement of phase-space density using the novel Kernel Density Estimation method. [Preview Abstract] |
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