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Angled Beams Request

The PHENIX collaboration seeks to investigate the systematic errors limiting pi0 measurements, primarily due to relative luminosity uncertainties. This proposal outlines a study using angled and offset beams with transverse polarization at √s=200 GeV for p+p interactions. Aiming to refine luminosity measurements and residual transverse polarization, the proposal suggests 8-hour stores with a consistent spin pattern across fills. Success in this study could lead to additional 500 GeV runs, enhancing polarization lifetime. More details can be found at the provided link.

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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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