2006 Fiscal Year Final Research Report Summary
Study of the Spin Structure of the Nucleon with W production in polarized pp collisions
| Project/Area Number |
16340072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Kyoto University |
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Principal Investigator |
SAITO Naohito Kyoto University, Graduate Schoolof Science, Associate Professor (20321763)
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| Co-Investigator(Kenkyū-buntansha) |
FUNAHASHI Haruhiko 京都大学, Graduate School of Science, Lecturer (00283581)
MURAKAMI Tetsuya 京都大学, Graduate School of Science, Assistant Professor (50219896)
YOSOI Mamoru 京都大学, Graduate School of Science, Assistant Professor (80183995)
TAKETANI Atsushi 理化学研究所, RIKEN, senior Researcher (30222095)
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| Project Period (FY) |
2004 – 2006
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| Keywords | nucleon structure / spin / sea-quark / hadron collider / electronics / level 1 trigger / data acquisition / weak interaction |
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| Research Abstract |
W production in polarized pp collisions is expected to play an important role in investigation of anti-quark distribution in the proton, since its production is dominated by quark-anti-quark scattering. Indeed, W+ should be produced from left handed up quark and right handed anti-down quark. Therefore W production in pp collision is one the best tools to study the spin flavor structure of the proton.
At the Relativistic Heavy Ion Colliser (RHIC) at Brookhaven National Laboratory can accelerate spin polarized proton beams up to 250 GeV and collide them to produce W boson copiously. Production of W can be identified with the detection of high momentum muon. To realize such measurement at PHENIX experiment, we should provide an additional capability to trigger data acquisition system by selecting the high momentum muon candidates. In this research program, we have developed the electronics board to provide a hit information from Muon Tracking Detector into the trigger decision algorithm. The newly developed electronics board steals about 10% of the pulse from the Muon Tracking Detector and amplifies to be discriminated with a given threshold. Such hit information will be processed in the Field Programmable Gate Arrays to select high momentum tracks, i.e. almost straight tracks at online level. This addition of the new electronics certainly increase the noise level in the existing read out system, and we need to minimize such effects. Within this research program, we have developed the electronics board with an optimal performance, and demonstrated that the increase in the noise level is fully acceptable with the real Muon Tracking Detectors.
Consequently we are now ready for the production of the new electronics system to realize the momentum selective muon trigger. For PHENIX experiment.
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