Bulletin of the American Physical Society
APS April Meeting 2015
Volume 60, Number 4
Saturday–Tuesday, April 11–14, 2015; Baltimore, Maryland
Session U4: Neutrino Cross Sections and Flux III |
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Sponsoring Units: DPF DNP Chair: Kevin McFarland, University of Rochester Room: Holiday 3 |
Monday, April 13, 2015 3:30PM - 3:42PM |
U4.00001: Neutrino Induced Coherent $\rho$ Production in a Fine Grained Tracker Libo Jiang, Christpher Kullenberg, Xinchun Tian, Sanjib Mishra We present simulation of neutrino induced coherent $\rho$-meson production in charged and neutral current interactions. Sensitivity studies of this process is presented in a fine grain tracker, a near detector option for LBNE. Measurements of coherent $\rho^0$ and $\rho^+$ production in NOMAD are reported. [Preview Abstract] |
Monday, April 13, 2015 3:42PM - 3:54PM |
U4.00002: Image Processing Techniques applied to Liquid Argon Time Projection Chamber Data Jessica Esquivel Large scale Liquid Argon Time Projection Chambers(LArTPC), like MicroBooNE, offer new ways to study neutrino cross sections and neutrino oscillations. The data from these LArTPCs are very detailed images of charged particles passing through the detector. A plethora of hit finding, cluster finding and tracking algorithms have been implemented to process data coming from MicroBooNE, but it is still possible that particle tracks that are easily visible by eye are being missed during data processing. Because the human eye sometimes does a better job at finding particle tracks that are sometimes missed by data processing, using Image Processing algorithms which emulate the human eye in conjunction with the already implemented algorithms could be beneficial. In particular Edge Detection algorithms could be useful due to the fact that tracks will often have defined deposited energy along straight lines. This talk will cover preliminary data processed with Edge Detection algorithms, and discussion of what the potential benefits are to this approach to LArTPC data analysis. [Preview Abstract] |
Monday, April 13, 2015 3:54PM - 4:06PM |
U4.00003: Software Geometry in Simulations Tyler Alion, Brett Viren, Tom Junk The Long Baseline Neutrino Experiment (LBNE) involves many detectors. The experiment's near detector (ND) facility, may ultimately involve several detectors. The far detector (FD) will be significantly larger than any other Liquid Argon (LAr) detector yet constructed; many prototype detectors are being constructed and studied to motivate a plethora of proposed FD designs. Whether it be a constructed prototype or a proposed ND/FD design, every design must be simulated and analyzed. This presents a considerable challenge to LBNE software experts; each detector geometry must be described to the simulation software in an efficient way which allows for multiple authors to easily collaborate. Furthermore, different geometry versions must be tracked throughout their use. We present a framework called General Geometry Description (GGD), written and developed by LBNE software collaborators for managing software to generate geometries. Though GGD is flexible enough to be used by any experiment working with detectors, we present it's first use in generating Geometry Description Markup Language (GDML) files to interface with LArSoft, a framework of detector simulations, event reconstruction, and data analyses written for all LAr technology users at Fermilab. [Preview Abstract] |
Monday, April 13, 2015 4:06PM - 4:18PM |
U4.00004: Background Reduction in Neutrino Oscillation Analyzes for a Liquid Argon-based Long-Baseline Neutrino Experiment Matthew Hogan, Daniel Cherdack, Robert Wilson The Long-Baseline Neutrino Experiment collaboration has developed a design for a next generation U.S. long-baseline neutrino experiment consisting of a large liquid argon neutrino detector 1300 km downstream of a wide-band neutrino beam. The goal of the experiment is to measure neutrino flavor oscillations, and to look for charge-parity symmetry violation (CPV) in the lepton sector. Simulations using a parametrized detector response are analyzed to determine the experimental sensitivity of the proposed design to CPV. Event selection algorithms, based on the identification of final-state lepton candidates, have a significant background acceptance from neutral-current (NC) interactions and charge-current (CC) $\nu_\tau$ interactions producing $\tau$ leptons which decay leptonically. In this work an improvement in the rejection of CC$\nu_\tau$ and NC backgrounds is explored for $\nu_e$-~appearance and $\nu_\mu$-~disappearance analysis samples. A multivariate analysis discriminator built from reconstructed kinematic variables, especially transverse momentum, has been shown to significantly improve background rejection with little loss in signal efficiency. Estimates for the improvements in background rejection and the changes in sensitivity for CPV determination will be presented. [Preview Abstract] |
Monday, April 13, 2015 4:18PM - 4:30PM |
U4.00005: Exploring Neutrino Oscillation Parameter Space with a Monte Carlo Algorithm Hugo Espejel, David Ernst, Bernadette Cogswell, David Latimer The $\chi^2$ (or likelihood) function for a global analysis of neutrino oscillation data is first calculated as a function of the neutrino mixing parameters. A computational challenge is to obtain the minima or the allowed regions for the mixing parameters. The conventional approach is to calculate the $\chi^2$ (or likelihood) function on a grid for a large number of points, and then marginalize over the likelihood function. As the number of parameters increases with the number of neutrinos, making the calculation numerically efficient becomes necessary. We implement a new Monte Carlo algorithm (D. Foreman-Mackey, D. W. Hogg, D. Lang and J. Goodman, Publications of the Astronomical Society of the Pacific, {\bf125} 306 (2013)) to determine its computational efficiency at finding the minima and allowed regions. We examine a realistic example to compare the historical and the new methods. [Preview Abstract] |
Monday, April 13, 2015 4:30PM - 4:42PM |
U4.00006: ABSTRACT WITHDRAWN |
Monday, April 13, 2015 4:42PM - 4:54PM |
U4.00007: Systematic Uncertainty Studies in the LBNE Fast Monte Carlo Jeremy Hewes, Daniel Cherdack In future long-baseline neutrino experiments, comprehensive understanding of systematic uncertainty will be critical in making simultaneous precision measurements of the CP-violating phase $\delta_{cp}$ and the ordering of neutrino mass states. The sensitivity of LBNE to these parameters is studied using My GLoBES Tools (MGT), a software package which extends GLoBES using inputs from LBNE MC simulations of beamline, neutrino interactions and parameterisations of detector response \& event reconstruction. This simulation chain is referred to as the LBNE Fast Monte Carlo. Using MGT and the Fast MC, detailed studies can be performed on the effect of individual sources of systematic uncertainty on experimental sensitivity, encompassing flux models, neutrino interaction models, particle identification and energy estimation. The impact of a subset of these uncertainties on the sensitivity of an experiment at LBNF will be presented, with a particular focus on those systematics which contribute most strongly to sensitivity degradation. [Preview Abstract] |
Monday, April 13, 2015 4:54PM - 5:06PM |
U4.00008: Simulation of Neutrino Flux in NO$\nu$A Kuldeep Maan, Hongyue Duyang, Sanjib Mishra We present the status of the simulation of the neutrino flux in NO$\nu$A. Effects of various error conditions in the beam-transport on the $\nu_{\mu}$ and $\nu_{e}$ flux at the near (ND) and far (FD) detectors is evaluated. The NDOS data are used to constrain the Kaon contribution to the $\nu_{e}$ flux. Finally, the ND data are used to constrain the muon-induced $\nu_{e}$. [Preview Abstract] |
Monday, April 13, 2015 5:06PM - 5:18PM |
U4.00009: Optical calibration of SNO$+$ Edward Leming Situated 2 km underground in Sudbury, Northern Ontario, the SNO$+$ detector consists of an acrylic sphere 12 m in diameter containing 780 tons of target mass, surrounded by approximately 9,500 PMTs. For SNO, this target mass was heavy water, however the change to SNO$+$ is defined by the change of this target mass to a novel scintillator. With the lower energy threshold, low intrinsic radioactivity levels and the best shielding against muons and cosmogenic activation of all existing neutrino experiments, SNO$+$ will be sensitive to exciting new physics. The experiment will be studying solar, reactor, super nova and geo-neutrinos, though the main purpose of SNO$+$ is the search for neutrinoless double-beta decay of Te-130. To meet the requirements imposed by the physics on detector performance, a detailed optical calibration is needed. Source deployment must be kept to a minimum and eliminated if possible, in order to meet the stringent radiopurity requirements. This led to the development of the Embedded LED/laser Light Injection Entity (ELLIE) system. This talk provides a summary of the upgrades to from SNO to SNO$+$, discussing the requirements on and methods of optical calibration, focusing on the deployed laserball and ELLIE system. [Preview Abstract] |
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