Sea Quark Polarization Measurement Via W-Boson in Forward Rapidity at PHENIX
- RIKEN, 2-1 Hirosawa, Wako, Saitama 351-0198 (Japan) and RIKEN BNL Research Center, Brookhaven National Laboraoty, Upton, NY 11973 (United States)
The Relativistic Heavy Ion Collider (RHIC) at BNL provides a unique opportunity to collide polarized protons. One of the hightlight of the spin program at {radical}(s) = 500 GeV is the direct measurement of sea quark contribution to the proton spin via W-boson production by measuring parity violating single spin asymmetry. A new trigger on forward muons in PHENIX identiienAoes and triggers on high momentum Ws suppressing a large number of low momentum muons coming from hadronic decays. Since the original muon trigger will fire on any muon above {approx}2 GeV/c, it will not provide the required rejection factor for 500 GeV running, which is about 4500. New fast readout trigger electronics and timing device were developed and installed to existing muon detection system in PHENIX. The performance of the new muon trigger and the fast turnaround offline analysis result from the first {radical}(s) = 500 GeV production run (Run11) will be discussed.
- OSTI ID:
- 22003988
- Journal Information:
- AIP Conference Proceedings, Vol. 1418, Issue 1; Conference: PacSPIN2011: 8. Circum-Pan-Pacific symposium on high energy spin physics, Cairns, QLD (Australia), 20-24 Jun 2011; Other Information: (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ASYMMETRY
BROOKHAVEN RHIC
GEV RANGE
HADRONIC PARTICLE DECAY
MULTIPARTICLE SPECTROMETERS
MUON DETECTION
PARITY
PARTICLE IDENTIFICATION
PARTICLE RAPIDITY
PERTURBATION THEORY
POLARIZATION
PROTON-PROTON INTERACTIONS
PROTONS
QUARKS
READOUT SYSTEMS
SPIN
W MINUS BOSONS
W PLUS BOSONS