Bulletin of the American Physical Society
84th Annual Meeting of the APS Southeastern Section
Volume 62, Number 13
Thursday–Saturday, November 16–18, 2017; Milledgeville, Georgia
Session D2: Particle Physics 1 |
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Chair: Timothy V. Daniels, University of North Carolina Wilmington Room: MSU Building University Banquet Room B |
Thursday, November 16, 2017 4:00PM - 4:12PM |
D2.00001: Construction of Neutron- and Muon-Sensitive Cosmic Ray Detectors Montgomery Steele, Carola Butler, Xiaochun He In the study of cosmic rays, there is a strong need for high-quality yet affordable equipment capable of tracking the secondary showers produced by collisions in the Earth's atmosphere. At Georgia State University, we are engaged in an ongoing project to develop the most efficient possible detector for the study of cosmic rays on the Earth’s surface. Our new detectors are capable of simultaneously detecting muons and neutrons over a wide range of energies using a novel system of scintillating optical fibers coupled to silicon photomultipliers. Our long-term goal is to use these detectors to set up ‘cosmic weather’ stations across the world to study the impact of cosmic rays at large scales. [Preview Abstract] |
Thursday, November 16, 2017 4:12PM - 4:24PM |
D2.00002: Studies of $B^\pm\to\phi K^{*\pm}$ decays from Belle. Alyssa Loos, Milind Purohit, Vishal Bhardwaj We present the status of a study of branching fractions, longitudinal polarization, and CP violation asymmetries in $B^\pm\to\phi K^{*\pm}$ decays with a sample of $772\times 10^6$ BBbar pairs collected by the Belle detector at the KEKB asymmetric energy $e^+e^-$ collider. Some measurements of these quantities have been made for charged and neutral B meson decays by the CLEO, BaBar, Belle, and LHCb experiments; the value of $f_L$, for instance, appears to be at variance with expectations. In this presentation we present results from simulations and an estimate of when we can present results using Belle data. [Preview Abstract] |
Thursday, November 16, 2017 4:24PM - 4:36PM |
D2.00003: Isospin Violation Measurement at the Upsilon(4S) Resonance Romulus Godang, George Bassett Isospin violation at the Upsilon(4S) resonance is an important input for many B meson measurements at B Factories. It may be at the level of a few percent mostly due to electromagnetic interactions and the mass different \newline of the up and the down quarks. We partially reconstruct neutral B meson in the semileptonic decay of $\backslash $bar\textbraceleft B\textbraceright \textasciicircum 0 $\to $ D\textasciicircum \textbraceleft *$+$\textbraceright lepton\textasciicircum - $\backslash $bar\textbraceleft $\backslash $nu\textbraceright . We discuss a model independent measurement of the branching fraction of Upsilon(4S) decays to neutral BB pairs based on a data sample of 470 million BB pairs collected at the Upsilon(4S) resonance with the BABAR detector at SLAC. [Preview Abstract] |
Thursday, November 16, 2017 4:36PM - 4:48PM |
D2.00004: DSMC Simulations of High Mach Number Taylor-Couette Flow Dr. Sahadev Pradhan The main focus of this work is to characterise the Taylor-Couette flow of an ideal gas between two coaxial cylinders at Mach number \textit{Ma }$=$\textit{ (U\textunderscore w / }$\backslash $\textit{sqrt\textbraceleft kb T\textunderscore w / m\textbraceright )}in the range 0.01 \textless Ma \textless , and Knudsen number \textit{Kn }$=$\textit{ (1 / (}$\backslash $\textit{sqrt\textbraceleft 2\textbraceright }$\backslash $\textit{pi d\textasciicircum 2 n\textunderscore d (r\textunderscore 2 - r\textunderscore 1))) }in the range 0.001 \textless Kn \textless , using two-dimensional (2D) direct simulation Monte Carlo (DSMC) simulations. Here, \textit{r\textunderscore 1}and \textit{r\textunderscore 2}are the radius of inner and outer cylinder respectively, \textit{U\textunderscore w}is the circumferential wall velocity of the inner cylinder, \textit{T\textunderscore w}is the isothermal wall temperature, \textit{n\textunderscore d}is the number density of the gas molecules, $m$and $d$ are the molecular mass and diameter, and \textit{kb}is the Boltzmann constant. The cylindrical surfaces are specified as being diffusely reflecting with the thermal accommodation coefficient equal to one. In the present analysis of high Mach number compressible Taylor-Couette flow using DSMC method, wall slip in the temperature and the velocities are found to be significant. Slip occurs because the temperature/velocity of the molecules incident on the wall could be very different from that of the wall, even though the temperature/velocity of the reflected molecules is equal to that of the wall. Due to the high surface speed of the inner cylinder, significant heating of the gas is taking place. The gas temperature increases until the heat transfer to the surface equals the work done in moving the surface. The highest temperature is obtained near the moving surface of the inner cylinder at a radius of about (1.26 r\textunderscore 1). [Preview Abstract] |
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