Bulletin of the American Physical Society
2012 Fall Meeting of the APS Division of Nuclear Physics
Volume 57, Number 9
Wednesday–Saturday, October 24–27, 2012; Newport Beach, California
Session PC: Instrumentation VI: RHI, High Energy |
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Chair: John Haggerty, Brookhaven National Laboratory Room: Plaza III |
Saturday, October 27, 2012 10:30AM - 10:42AM |
PC.00001: Studies of Displaced Vertex Distributions using the new FVTX Tracker in PHENIX Jeongsu Bok The principal motivation for the Forward Vertex (FVTX) upgrade to the PHENIX detector at RHIC is the observation of displaced vertices due to the weak decay of heavy mesons ($D$ and $B$ for example). These mesons travel approximately 1 mm before decaying, and so the decay products appear to come from a different location than the primary event vertex. The distributions of the ``distance of closest approach'' (DCA) for decay tracks from short-lived heavy-flavor mesons and long-lived ordinary mesons ($K$ and $\pi^\pm$) computed with respect to the primary vertex are sufficiently different to allow for significant background rejection and enhancement to the signal/noise ratio in our sample of heavy-flavor tagged events. We present a simulation of these DCA distributions and also compare to the first FVTX data collected in the RHIC 2012 run. [Preview Abstract] |
Saturday, October 27, 2012 10:42AM - 10:54AM |
PC.00002: Forward GEM Tracker (FGT) at STAR Bernd Surrow As part of our program to understand the internal structure of the proton, we have and will continue mid-rapidity ($-1<\eta<1$) W and di-jet measurements in p+p collisions at $\sqrt{s} = 500GeV$. The ongoing STAR W program is exploring the longitudinal spin contribution of anti-u and anti-d quarks to the proton spin. The gluon spin contribution can be probed through di-jet measurements. The Forward GEM Tracker (FGT) at STAR will enhance the charged sign separation for high $p_{T}$ tracks in the pseudo-rapidity range of $1.0<\eta<2.0$, and therefore allows an extension of W and di-jet measurements at forward pseudo-rapidity. We will present the status of the FGT assembly and completion along with projections for future W and di-jet measurements. We will discuss studies that explore the possibilities of using the FGT to reconstruct jets in the forward direction. [Preview Abstract] |
Saturday, October 27, 2012 10:54AM - 11:06AM |
PC.00003: Run 12 Progress of the Forward GEM Tracker at STAR Emily Zarndt The STAR experiment at RHIC provides high precision tracking via a TPC, but its efficiency and $p_T$ resolution are limited at forward rapidity, $\eta > 1.3$. Tracking in the forward direction is of particular importance for detecting the $e^\pm$ decay products of W-bosons produced in polarized p-p collisions, relevant to constraining anti-quark polarization within the proton. In order to extend coverage of STAR's precision tracking, a Forward GEM Tracker (FGT) in the form of four independent triple-GEM detectors, arranged as quarter sections on honey-comb disks, was partially installed prior to Run 12 and commissioned during Run 12. During the FGT engineering run in 2012, several operating parameters, including gas mixture, high voltage, and electronics timing, were varied in order to study their effect on detector performance. The progress of the commissioning, and analysis of the FGT's efficiency, noise, and cluster size, will be presented. [Preview Abstract] |
Saturday, October 27, 2012 11:06AM - 11:18AM |
PC.00004: Recent Performance of the PHENIX Forward Trigger Upgrade Michael Daugherity The Relativistic Heavy Ion Collider (RHIC) at Brookhaven National Laboratory is the world's only polarized proton-proton collider, and significant 500 GeV collision data taken over the past few years are enabling an exciting new W-boson physics program. Since W production is very sensitive to the spin-dependent sea-quark distributions, these measurements will provide new insight into the flavor separated spin structure of the proton. To take full advantage of this program, the PHENIX detector has undergone an extensive upgrade to significantly improve triggering on high-momentum muons produced by W decay at forward rapidity. The upgrade consists of new front-end electronics for the existing muon tracking chambers as well as new resistive plate chambers (RPCs) at two stations in each muon arm. The RPCs are based on a design established by CMS to provide a fast and efficient trigger over a very large area. The PHENIX Forward Upgrade Working Group was able to install and commission the final RPC stations for RHIC Run 12. This talk will review the current status and performance of the RPCs including the first data taken by the complete forward muon trigger. [Preview Abstract] |
Saturday, October 27, 2012 11:18AM - 11:30AM |
PC.00005: The eRHIC Detector: Design and Realisation Elke-Caroline Aschenauer eRHIC is a proposed high luminosity, polarized Electron Ion Collider (EIC), which would make use of the existing RHIC infrastructure. eRHIC is a triple IP collider, with the possibility of using the two existing (but upgraded) detectors, PHENIX and STAR, and a dedicated eRHIC detector. eRHIC is a triple-IP collider, with a dedicated eRHIC detector and the possibility of using the two existing, but upgraded IP detectors PHENIX and STAR. A detector has to be designed that can make use of present knowledge and experience gained from the HERA detectors, but has to be adapted to suit the EIC physics program. This presentation will describe the eRHIC detector and interaction region designs as well the presently ongoing R\&D activities for making technology choices towards such a detector. [Preview Abstract] |
Saturday, October 27, 2012 11:30AM - 11:42AM |
PC.00006: A New Large Area Drift Chamber for Drell-Yan Measurements in a High Rate Background Environment with the COMPASS Experiment at CERN Pedro Montuenga The COMPASS experiment at CERN intends to study transverse momentum dependent quark Sivers distributions in the nucleon through the Drell-Yan process in pion collisions against polarized proton targets. The measurement will require two new stations of drift chambers for the Large Angle Spectrometer (LAS) in COMPASS. The detector will consist of two planar drift chamber stations with 8 wire planes each and a position resolution of 250 $\mu$m per plane. The high rate background environment requires a small pitch of 8 mm between sense wires. In this talk we will discuss the detector design, simulation studies with GARFIELD and the construction and test of a prototype at the UIUC Nuclear Physics Laboratory. [Preview Abstract] |
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