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Angled Beams Request

Angled Beams Request. PHENIX pi0-A LL measurements are currently limited by systematic errors Dominant source: Relative luminosity. Error is estimated with the difference between the spin-sorted BBC and ZDC rates.

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Angled Beams Request

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  1. Angled Beams Request • PHENIX pi0-ALL measurements are currently limited by systematic errors • Dominant source: Relative luminosity. Error is estimated with the difference between the spin-sorted BBC and ZDC rates. • Idea: ZDC neutron AN + residual transverse polarization during longitudinal beam + angled and/or offset beams are distorting the true luminosity measured by ZDC. • Proposal to study the effect • Baseline: Four √s=200 GeVpp with transverse polarization fills with +/- 400 and +/- 200 μrad angle. • All 4 storesshould have the same spin pattern. • 8 hour stores • Do not want fills early in Run-12 • Depending on the study’s success, we may expand the request to some additional stores during the 200 GeV p+p running and possibly 1 or 2 additional fills at √s=500 with transverse polarization. For more details see: http://www.phenix.bnl.gov/WWW/publish/shura/RSC/2012/2012-01-27/RelLum_PHENIX_27jan2012.pdf

  2. ANGLED Beam OFFSET Beam

  3. Slightly Increased Collision Energy in p+p Running • PHENIX supports the proposal for running at p+p 510 GeV if it improves the polarization lifetime as expected. • We prefer any development of the new working point during the 200 GeV p+p running be done during APEX or machine development time. We don’t want to take significant amounts of 200 GeV p+p data at 201 GeV.

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