Bulletin of the American Physical Society
Spring 2015 Meeting of the APS New England Section
Volume 60, Number 5
Friday–Saturday, April 24–25, 2015; Boston, Massachusetts
Session F1: High Energy Physics |
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Chair: Jason Christopher, Boston University Room: Life Sciences and Eingeering Building B01 |
Saturday, April 25, 2015 11:30AM - 11:42AM |
F1.00001: The PHENIX Muon Piston Calorimeter Extension (MPE-EX) at RHIC Dhruv Dixit, William Roh, Fernando Torales-Acosta The Muon Piston Calorimeter Extension (MPC-EX) is a Silicon(SI) -Tungsten(W) preshower detector that is 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, which allow identification and reconstruction of $\pi ^0$ mesons out to energies $>$ 80 GeV. The MPC-EX will uniquely enable us to measure phenomena related to low momentum partons in the target nucleus and the high momentum partons in the projectile nucleus. Currently, the MPC-EX is taking data in the RHIC Run-15. Run-15 is a p+A collision, where p is a proton and A is a heavy ion. 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 $\pi ^0$ decay photons. 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 shows that the MPC-EX causes an EM shower prior to reaching the MPC. The data demonstrates the MPC-EX's ability to distinguish between double and single EM showers, allowing for $\pi ^0$ reconstruction. [Preview Abstract] |
Saturday, April 25, 2015 11:42AM - 11:54AM |
F1.00002: Spiral Disk Instability in Binary White Dwarf Mergers as a Progenitor to Type Ia Supernovae Rahul Kashyap, Robert Fisher, Enrique Garcia-Berro, Gabriela Aznar-Siguan, Suoqing Ji, Pablo Laren-Aguilar Type Ia supernovae (SNe Ia) provide us with the most precise cosmological tool currently available to study the nature of dark energy. However, the stellar progenitors which give rise to SNe Ia remain mysterious. A leading mechanism for normal SNe Ia is the merger of two white dwarfs in the double-degenerate (DD) channel. However, despite promising observational evidence in their support, until recently it was not~clear how detonation conditions could be achieved in a self-consistent fashion during the merger of carbon-oxygen white dwarf binaries. In collaboration with European colleagues, in high-resolution three-dimensional numerical simulations, we have recently found, for the first time, that gravitational instability in a merging white dwarf binary leads to a self-consistent detonation of a primary WD on a dynamical time scale. Further implications of this mechanism will be explored in the solution of the SN Ia progenitor problem. [Preview Abstract] |
Saturday, April 25, 2015 11:54AM - 12:06PM |
F1.00003: LHC at CERN -- Machine and Experiments Sergio Bertolucci The talk will describe the organizational models of CERN (as host laboratory) and of the hosted experiments, outlining their peculiarities and their interactions [Preview Abstract] |
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