Bulletin of the American Physical Society
2017 Fall Meeting of the APS Division of Nuclear Physics
Volume 62, Number 11
Wednesday–Saturday, October 25–28, 2017; Pittsburgh, Pennsylvania
Session KF: New Opportunities in Hadron Physics |
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Chair: Cynthia Keppel, Thomas Jefferson National Accelerator Facility Room: Salon 6 |
Friday, October 27, 2017 2:00PM - 2:12PM |
KF.00001: A New Simulation Framework for the Electron-Ion Collider John Arrington Last year, a collaboration between Physics Division and High-Energy Physics at Argonne was formed to enable significantly broader contributions to the development of the Electron-Ion Collider. This includes efforts in accelerator R&D, theory, simulations, and detector R&D. I will give a brief overview of the status of these efforts, with emphasis on the aspects aimed at enabling the community to more easily become involved in evaluation of physics, detectors, and details of spectrometer designs. We have put together a new, easy-to-use simulation framework using flexible software tools. The goal is to enable detailed simulations to evaluate detector performance and compare detector designs. In addition, a common framework capable of providing detailed simulations of different spectrometer designs will allow for fully consistent evaluations of the physics reach of different spectrometer designs or detector systems for a variety of physics channels. In addition, new theory efforts will provide self-consistent models of GPDs (including QCD evolution) and TMDs in nucleons and light nuclei, as well as providing more detailed physics input for the evaluation of some new observables. [Preview Abstract] |
Friday, October 27, 2017 2:12PM - 2:24PM |
KF.00002: Machine Learning Background Reduction at E-906 SeaQuest Daniel Morton The Fermilab E906 SeaQuest experiment measures muons produced from a 120 GeV proton beam incident on liquid Hydrogen, Deuterium and solid C, Fe and W targets. Muons produced through the Drell-Yan process are used to measure nuclear effects, and measure the flavor asymmetry in the nucleon sea. However, the Drell-Yan dimuons have a low branching ratio and despite the spectrometer being optimized to measure dimuons, a large background is present. Therefore background removal is attempted through both designing a specialty trigger and event classification using machine learning techniques. This would improve the error bars and potentially the accuracy of results. [Preview Abstract] |
Friday, October 27, 2017 2:24PM - 2:36PM |
KF.00003: SHMS Hodoscopes and Time of Flight System Kayla Craycraft, Simona Malace As part of the Thomas Jefferson National Accelerator Facility's (Jefferson Lab) upgrade from 6 GeV to 12 GeV, a new magnetic focusing spectrometer, the Super High Momentum Spectrometer (SHMS), was installed in experimental Hall C.~The detector stack consists of horizontal drift chambers for tracking, gas Cerenkov and Aerogel detectors and a lead glass calorimeter for particle identification.~ A hodoscope system consisting of three planes of scintillator detectors (constructed by James Madison University) and one plane of quartz bars (built by North Carolina A{\&}T State University) is used for triggering and time of flight measurements. This presentation consists of discussion of the installation, calibration, and characterization of the detectors used in this Time of Flight system. [Preview Abstract] |
Friday, October 27, 2017 2:36PM - 2:48PM |
KF.00004: A Post Shower detector for the FMS to study Drell Yan and Direct Photons David Kapukchyan One of the goals of the 2017 run at STAR was to measure the direct photon and Drell Yan electrons in polarized $pp$ collisions in order to understand the Sivers and Collins effects. To make such a measurement a postshower detector (FPOST) for the Forward Meson spectrometer (FMS) was commissioned and installed for the 2017 run. The FMS together with its preshower (FPS) detector and the new FPOST cover $2<\theta<8$ of STAR. The FPOST itself is located downstream the FMS as its name suggests. Like the FPS the FPOST is a scintillator hodoscope with a channel size that matches that of the FMS. Its purpose is to discriminate the hadrons that punch through and the partially contained showers that leak out of the FMS. This talk will discuss the design requirements and performance of the FPOST during the 2017 run. [Preview Abstract] |
Friday, October 27, 2017 2:48PM - 3:00PM |
KF.00005: Science opportunities with a New Neutral Particle Spectrometer and a compact High Intensity Photon Source at Jefferson Lab Tanja Horn The two-arm combination of a high-resolution neutral-particle spectrometer (NPS) and a magnetic spectrometer offers unique scientific capabilities to push the energy scale for studies of the transverse spatial and momentum structure of the nucleon. It enables precision measurements of the DVCS cross section at different beam energies to extract the real part of the Compton form factor and of the semi-inclusive neutral-pion cross section to validate QCD factorization. It allows measurements to push the energy scale of real Compton scattering, the process of choice to explore factorization in a whole class of wide-angle processes, and its extension to neutral pion photo-production. The combination of high precision calorimetry with NPS and a novel compact high intensity photon sources greatly enhances scientific benefit to exclusive processes like wide-angle and time-like Compton scattering with transverse polarized targets. It offers a gain in scientific production of a factor of 30 as compared to existing techniques. A similar compact high-intensity photon source technique would allow a gain of two decades to produce a KL beam, which would open new avenues for hadron spectroscopy. We describe the science program enabled by the NPS and a novel compact high intensity photon source [Preview Abstract] |
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