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STAR Collaboration Update on Polarimetry and Trigger Performance - Texas A&M University

This update from the STAR Collaboration, presented by Pibero Djawotho on March 8, 2011, covers the goals, current status, and projections related to online ZDC polarimetry. It details raw asymmetry fill numbers, BBC coincidence requirements, and EMC hit data. The findings indicate that ZDC singles corrections are now included in luminosity estimations, revealing a slight reduction in values. Achievements are noted, with less than 50% of transverse goals met. Background sources are currently under investigation, primarily associated with the yellow beam and observed by various detectors.

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STAR Collaboration Update on Polarimetry and Trigger Performance - Texas A&M University

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  1. STAR Update for Run 11 Pibero Djawotho for the STAR Collaboration Texas A&M University 8 March 2011

  2. Goals, current status and projections

  3. Online ZDC polarimetry Raw Asymmetry Fill Number BBC coincidence requirement imposed

  4. Barrel EMC ‘hits’ (η,Φ) for events w/ no reco TPC vertex L2BW Trigger Blue Abort Gap Yellow Abort Gap Φ Hit towers: ADC-ped>10 ie. ~150 MeV threshold η -Z (east) +Z (west)

  5. Conclusions • ZDC singles corrections now included in estimate of sampled luminosity  slight reduction compared to old values • Achieved < 50% of transverse goals for all triggers • Online ZDC polarimetry up and running • Background appears to originate mostly from yellow beam and seen by BEMC, EEMC and BTOF  ongoing investigation

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