Bulletin of the American Physical Society
Annual Meeting of the APS Four Corners Section
Volume 62, Number 17
Friday–Saturday, October 20–21, 2017; Fort Collins, CO
Session K7: Particle and Nuclear Physics IV |
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Chair: John Harton, Colorado State University Room: Lory Student Center 386 |
Saturday, October 21, 2017 9:25AM - 9:49AM |
K7.00001: Particle discoveries at the LHC Invited Speaker: Sally Seidel Several new particles have been discovered at the Large Hadron Collider in addition to the Higgs boson. The properties of these new bound states will be reviewed, and their potential for refining our understanding of the strong interaction or pointing toward new physics will be discussed. [Preview Abstract] |
Saturday, October 21, 2017 9:49AM - 10:01AM |
K7.00002: Forward Folding Likelihood Fitting as a Method for Kinematic Unfolding at T2K Thomas Campbell Particle physicists are often interested in measuring observable properties (momentum, energy, etc.) of particles in their detectors. However, the inherent imperfections of particle detectors of any kind lead to an important question: If a particle is produced in a detector with some true value of an observable quantity, what value will the detector measure? Furthermore, to what extent is it possible to infer information about the observable's true values knowing only the value measured by the detector? The process of attempting to infer the true values of observable properties (kinematics) from the measured values for those kinematics for some collection of particles produced in a detector is referred to as ``kinematic unfolding." This talk will briefly present one method of attempting this process that has been implemented in a current analysis at T2K to make a world first measurement of the muon anti-neutrino CC-0$\pi$ cross section on water. General ideas of the method as well as its specific application to this analysis including data results will be presented. [Preview Abstract] |
Saturday, October 21, 2017 10:01AM - 10:13AM |
K7.00003: Multi-Particle Identification Using Convolutional Neural Networks In MicroBooNE Samantha Sword-Fehlberg Experiments in particle and nuclear physics often produce events with many energetic particles in the final state. Reconstructing the energy and momentum of those particles from detector information is often challenging. In the last decade, image-reconstruction software has started to be used in the identification of particles in physics event data. Multi-particle identification (MPID) is a process in which a convolutional neural network can be used to identify the types of particles within a reconstructed image. This is different from traditional reconstruction techniques which try to first identify each particle individually and then put together the multi-particle aspects of the event in a second step. MPID not only mitigates bias in training due to imperfect cluster reconstruction but can also lead to particle multiplicity recognition. The MicroBooNE collaboration is interested in using these methods in identification of events with a single lepton and proton in the final state, which are useful in the exploration of the excess of low energy electromagnetic events seen in MiniBooNE as well as in the exploration of nucleon-nucleon (NN) correlations. We present here the results of a simulated lepton+proton test sample as well as future plans for NN correlation studies. [Preview Abstract] |
Saturday, October 21, 2017 10:13AM - 10:25AM |
K7.00004: Determining Thermal Shock Effects on Silicon Photo-Multipliers for use in DUNE Connor Johnson, Norm Buchanan, Aurora Popescu, Justin Cole The Deep Underground Neutrino Experiment (DUNE) is a next generation neutrino oscillation experiment that will utilize an intense beam of neutrinos produced at Fermilab. The beam will travel 1300 km through the earth to a 40 kton liquid argon detector located near Lead, SD. The far detector will consist of liquid argon Time Projection Chambers (TPCs) instrumented with photon detectors. The photo-sensors used to detect light collected by the photon detection system will be silicon photomultipliers (SiPMs). As the SiPMs will be operated at liquid argon temperature they must be qualified for operation in this environment. In this presentation I will discuss a program developed at CSU to qualify Sensl C-Series SiPMs, and corresponding readout boards, for the thermal shock survivability and post shock operation. [Preview Abstract] |
Saturday, October 21, 2017 10:25AM - 10:37AM |
K7.00005: The Short Baseline Program at Fermilab Tyler Boone, Robert Wilson The Short Baseline Neutrino (SBN) program at Fermilab will measure the muon- and electron-neutrino spectra at three locations in the Booster Neutrino Beam. The primary goal of the program is to search for evidence of sterile neutrinos; by assuming a 3 (known) +1 (sterile) neutrino mass model we will explore an area of mass difference phase space $\delta$m$^2 \approx$1 eV$^2$ region that could explain the MiniBooNE and LSND anomalies. The experiment will also be beneficial to future neutrino experiments through the experience gained with the use of three liquid argon time projection chambers (LArTPCs), SBND, MicroBooNE, and the ICARUS T600. We We will present an overview of the experiment and summarize the ongoing Colorado State University group contributions. [Preview Abstract] |
Saturday, October 21, 2017 10:37AM - 10:49AM |
K7.00006: Measurement of the Lifetime of Cosmic Ray Muons Ian Brubaker, Darrel Smith In this experiment, cosmic rays create scintillation light as they pass through a 5 gallon mineral oil/scintillator detector, as observed by three photomultiplier tubes. Some of the low-energy cosmic muons come to rest in the detector and their subsequent decays ($\mu^+ \to e^+ \, \bar{\nu}_{\mu} \, \nu_e$ + \, $C.C.$) are observed as a second burst of light. The decay lifetime of 498,987 stopping muons were measured and the mean muon lifetime ($\tau_{\mu}$) was calculated to be $\tau_{\mu} = (2.119 \pm 0.003) \,\mu s$. The composition of cosmic muons includes both positive and negative muons, and a small fraction of the $\mu^-$ cosmic rays are captured by hydrogen and carbon nuclei in the mineral oil ($CH_2$) resulting in a capture lifetime of $\tau_{cap} = (57 \pm 2)\,\mu s$. [Preview Abstract] |
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