1 / 11

STAR Status/Plan 20080215 RHIC Spin Meeting L.C. Bland

STAR Status/Plan 20080215 RHIC Spin Meeting L.C. Bland. Local Polarimetry Status Plan. Effective Analyzing Power BBC Polarimeter. Analysis from available run-6 data  more complete analysis still to do

vangie
Download Presentation

STAR Status/Plan 20080215 RHIC Spin Meeting L.C. Bland

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. STAR Status/Plan20080215 RHIC Spin MeetingL.C. Bland • Local Polarimetry • Status • Plan

  2. Effective Analyzing PowerBBC Polarimeter • Analysis from available run-6 data  more complete analysis still to do • Event data suggests BBC very similar year to year  assume same effective analyzing power for run 8

  3. Run-8 Status • Needed to retime bits to “Crawford” scaler due to hardware upgrade • Timing completed prior to RHIC store 9850 (20080212) • Run-8 beam polarization using run-6 effective analyzing power Measurements continuous between Tstart,Tstop only for 9880

  4. Forward Meson Spectrometer North FMS half before sealing

  5. STAR Plan for Run-8 p+ p From Gagliardi presentation to 22 January 2008 weekly planning meeting

  6. Physics goals for the 200 GeV p+p run • Comparison data for FMS CGC search • Extend xF and pT range for forward single-spin asymmetries • Study direct photon asymmetries in forward direction • Electrons from Charm and Bottom, with low material, to resolve STAR/PHENIX discrepancy What do these need?

  7. FMS progress during d+Au • If things don’t break, we will achieve the reduced goal • If things go well, we might end up at ~40 nb-1 • 40 nb-1 is the same nucleon-nucleon luminosity as 16 pb-1 of pp • RdAu reduces somewhat the pp luminosity needed for equal statistics Original goal 25 nb-1 as of midnight last night Reduced goal Red triangles are with final or near-final PMT gains

  8. Forward single-spin asymmetries • Acceptance of FMS and projected RHIC performance will enable… • Further reach for inclusive p0 and heavy mesons • Spin-dependent near-side correlations (p0-p0)  separation of Sivers and Collins effects • Spin-dependent away-side correlations (p0-jet)  isolation of Sivers effect • Embark on spin-dependent inclusive g and g+jet Projections for 9 pb-1 recorded with 70% polarization

  9. Transverse spin direct g Theory expects repulsive color charge interactions to result in an opposite sign to spin-correlated momentum imbalance for g+jet. Magnitude of effect requires >105 events to see significant effect. Bacchetta et al., PRL 99, 212002 Comparison of run-6 data to simulation provides indication that prompt g can be extracted. The large acceptance and dynamic range of the FMS is needed to veto daughter g from p0,h,… decays. Expect >0.150K g events with E>25 GeV into small fiducial volume in 9 pb-1 sampled.

  10. What might we expect? • Anticipate 10 to 24 pb-1 delivered for four weeks of physics production

  11. Goals for the 200 GeV pp run • FMS reference data • Sample at least 9 pb-1 with fast detectors • FMS transverse spin asymmetry measurements • Sampled figure of merit (P2L) at least 3.8 pb-1 with fast detectors • Equivalent to 9 pb-1 at 65% polarization • Slow detector measurements for non-photonic electrons • Sample at least 4.5 pb-1 • This requires: • C-AD deliver at least 18 pb-1 (assumes 50% STAR up time) • STAR operate the slow detectors with at least 50% live time • FMS fast detector data recorded when the slow detectors are both live and dead • Has not been done during this year’s d+Au run • Was done during Run 6 p+p

More Related