Bulletin of the American Physical Society
2014 Annual Meeting of the Mid-Atlantic Section of the APS
Volume 59, Number 9
Friday–Sunday, October 3–5, 2014; University Park, Pennsylvania
Session E3: High Energy and Nuclear Physics |
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Chair: Anna Stasto, Pennsylvania State University Room: Life Sciences Building 005 |
Saturday, October 4, 2014 3:30PM - 3:42PM |
E3.00001: Non-Standard Neutrino Interactions in the mu tau sector Warren Wright, Irina Mocioiu This research focuses on Non-Standard Interactions and their effects on neutrino oscillations. In particular, we focus on the effects of the parameter $\epsilon$ $\mu$ $\tau$ on muon neutrino survival probability and the number of muons measured in IceCube's DeepCore detector. These effects are found to be sign asymmetric and an analytic model is presented that predicts points of maximum sign asymmetry. Furthermore, we discuss the implications these sign asymmetric effects have on mass hierarchy determination. [Preview Abstract] |
Saturday, October 4, 2014 3:42PM - 3:54PM |
E3.00002: Sterile neutrinos at LBNE David Hollander, Irina Mocioiu In this paper we examine the sensitivity of the Long Baseline Neutrino Oscillation Experiment to the inclusion of two new sterile neutrino flavors with masses in the eV range. We implement a modified Casas-Ibarra parametrization which can accommodate medium scale mass eigenstates and introduces a new complex mixing angle. We explore the new mixing angle parameter space and demonstrate how LBNE can be used to either provide evidence for or rule out a particular model of sterile neutrinos. Certain three-flavor CP-violation scenarios cannot be distinguished from the sterile neutrinos. Constraints from the Daya Bay reactor experiment are used to help lift this degeneracy. [Preview Abstract] |
Saturday, October 4, 2014 3:54PM - 4:06PM |
E3.00003: The PHENIX Muon Piston Calorimeter Extension (MPE-EX) at RHIC Dhruv Dixit, Fernando Torales-Acosta The Muon Piston Calorimeter Extension(MPC-EX) is a Silicon(SI)-Tungsten(W) preshower detector that will be installed as an extension to the current PHENIX Muon Piston Calorimeter(MPC). The extension consists of eight alternating layers of Si minipad sensors and W absorbers. The Si-W layers allow the identification and reconstruction of the $\pi^0$ meson out to energies greater than 80 GeV. The MPC-EX will uniquely enable us to measure phenomena related to both low momentum partons in the target nucleus and the high momentum partons in the projectile nucleus. Run-15 collision will be a proton and heavy ion collision. The MPC-EX will help distinguish between the direct photons, that result when a valence quark in the projectile scatters off a gluon in the target nucleus, and decay photons that result from $\pi^0$ decay. The measurements at momentum fraction of $10^{-3}$ order of magnitude will provide high statistics data that can be used to understand the gluon saturation at low momentum in the nuclei. The test beam data from the Stanford Linear Accelerator Center test shows that the MPC-EX causes an EM shower prior to reaching the MPC. The data also demonstrates the MPC-EX's ability to distinguish between double and single EM showers, allowing for $\pi^0$ reconstruction. [Preview Abstract] |
Saturday, October 4, 2014 4:06PM - 4:18PM |
E3.00004: Photoactivation of $^{\mathrm{176m}}$Lu via Bremsstrahlung at the Stuttgart DYNAMITRON Brian Goddard, Tom Henry, Trevor Balint, Heinz-Hermann Pitz, Frank Stedile, Ulrich Kneissl, Jeremy Gaison, Chris Chiara, Tristan Winick, Jeff Carroll The ground state of $^{176}$Lu has a very long half-life of approximately 37 billion years and primarily $\beta^{-}$ decays (\textgreater 99.9{\%}) to $^{176}$Hf. However, $^{176}$Lu possesses an isomer (J$^{\pi} = $ 7$^{-})$ 123 keV above the ground state (J$^{\pi} = $ 1$^{-})$ that also $\beta ^{-}$ decays to $^{176}$Hf but with a much shorter half-life of about 3.6 hours. The study of this isomer could lead to new findings regarding astrophysical nucleosynthesis. A disparity between the predicted abundance of $^{176}$Lu due to nucleosynthesis and the actual measured abundance implies that transitions from the isomer to the ground state via intermediate states must have taken place during the s-process. Since the rates at which these transitions occur are temperature dependent, $^{176}$Lu could be used as an s-process ``thermometer.'' A photoactivation experiment was performed on $^{176}$Lu at the Stuttgart DYNAMITRON using bremsstrahlung with varying endpoints between 0.7 and 2.2 MeV to determine the intermediate state energies and integral cross sections for the transitions that lead to the isomer. We present the results of the analysis of the data as well as preliminary values for the intermediate state energies and their cross sections. [Preview Abstract] |
Saturday, October 4, 2014 4:18PM - 4:30PM |
E3.00005: Fundamental measurements of the proton's sub-structure using high-energy polarized proton-proton collisions Bernd Surrow Understanding the structure of matter in terms of its underlying constituents has a long tradition in science. A key question is how we can understand the properties of the proton, such as its mass, charge, and spin (intrinsic angular momentum) in terms of its underlying constituents: nearly massless quarks (building blocks) and massless gluons (force carriers). The strong force that confines quarks inside the proton leads to the creation of abundant gluons and quark-antiquark pairs (QCD sea). These ``silent partners'' make the dominant contribution to the mass of the proton. Various polarized deep-inelastic scattering measurements have shown that the spins of all quarks and antiquarks combined account for only $25\%$ of the proton spin. New experimental techniques are required to deepen our understanding on the role of gluons and the QCD sea to the proton spin. High energy polarized proton-proton ($p+p$) collisions at RHIC at Brookhaven National Laboratory provide a new and unique way to probe the proton spin structure using very well established processes in high-energy physics, both experimentally and theoretically. Various results in polarized $p+p$ collisions will be presented. [Preview Abstract] |
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