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STAR Spin updates

STAR Spin updates. Akio Ogawa RSC Meeting 2006 July 28 Stonybrook. . . STAR 2006 Improvements Greatly Enhance p+p Program. Completion of barrel EMC readout (except for some preshower supplies) Installation of tunnel shielding before and during run.

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STAR Spin updates

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  1. STAR Spin updates Akio Ogawa RSC Meeting 2006 July 28 Stonybrook

  2.  STAR 2006 Improvements Greatly Enhance p+p Program • Completion of barrel EMC readout (except for some preshower supplies) • Installation of tunnel shielding before and during run • Full exploitation of L0 and L2 EMC-based triggers for higher efficiency di-jet and photon/ 0 triggers • FPD++ expands forward ( = 2.5 -- 4.0) EMC coverage E.g., (1)+(2)+(3)  order of magnitude increase in di-jet sample over 2005, for same integrated luminosity (3 pb–1) !

  3. STAR Run6 Overview Transverse Running Slow detector (w/TPC+BEMC+EEMC) L = 3.2 pb-1,154DAQ hours, 15.5M events Fast detector (EMCs but no TPC) L= 6.8 pb-1 Longitudinal Running Slow detector (w/TPC+BEMC+EEMC) L = 5.9 pb-1,150DAQ hours, 14.1M events

  4. Run3-4 Inclusive Jet paperThis will be submitted to PRL next week! Principal Authors (PA): J. Kiryluk, M. Miller, S. Trentalange, D. Thein, R. Fatemi, A. Kocoloski, K. Kowalik, D. Relyea, E. Sichtermann, J. Sowinski, B. Surrow and S. Vigdor

  5. 2005 Jet analysisResult will be shown soon (this summer) • Factor 10 more jets than 2003/2004 • Combined statistical uncertainty: 0.003 to 0.04 from pT = 5 - 24 GeV/c • Results are consistent among different triggers and 2003/2004 ALL • Current focus: Firm evaluation of systematic uncertainties! • Very time-consuming: • Vertex-dependent relative luminosities • Non-zero longitudinal single-spin asymmetries

  6. L2-Jet & L2-HTTP L=6/pb P=0.6 Run 6 jet sensitivity projection revisitedBased on actual data we took

  7. EMC Barrel  = -1 EMC Endcap y TPC   =+2 x BBC East BBC West Jet 1 ET> 3.6 GeV yellow blue -60 deg EMCal Geometry in L2 trigger +60 deg Barrel EMC -1 -units =+ 0 1 2 Endcap EMC Jet 2 ET> 3.3 GeV STAR Excellent Coverage for Di-Jets L2 jet

  8. STAR Triggered on Di-Jet Found On-line • L0 di-jet logic: • BBC East.West • Etot >14 GeV • hardwired jet patches • jet size : 1x1 (x) • one jet Et>4.0 GeV • event rate ~120 Hz Comparison with off-line  similar Z=Et/GeV =360o 2005 data event Jet  is weighted with EM ET • L2 di-jet logic: • 5500 EMC towers • sliding jet patches • jet size : 0.6x0.6 (x) • jet1 Et>3.6, jet 2 Et>3.3 GeV • decision : 60 muSec/event • event rate ~8 Hz =180o ~180 o back-to-back di-jet L2 algo result • L0-L2 logic benefits: • large acceptance combined with trigger rejection power • full statistics on-line trigger monitoring of EMC • compact trig info saved for each event =0o  -1 0 +2

  9. 2< 60o Back-to-back di-jets 2006 STAR Di-jet Sensitivity Exceeds Predicted Amplitude of Sivers AN • 4 weeks after 2006 data taking PRELIMINARY estimate of statistical uncertainty is: • (eps)=0.04o • Caveats: • based on EMC-only, online di-jeta • beam pol not included • cos() weight correction not in • different kinematic cuts • Spin dependent -distributions • total 3,000,000 di-jets (~half of available) B+ Y- B+ Y+ B- Y+ B- Y-

  10. Completed FPD++ Provides left/right symmetric calorimeters for detection of jet-like events

  11. sampled Transverse spin runs at STAR with forward calorimetry: 2001→2006

  12. West-north small cells diphoton invariant mass vs. E East-north diphoton invariant mass vs. E • Calibrations of west FPD++ inner calorimeter complete for s = 200 GeV data • Results will probe the pT dependence of AN(p0) for xF > 0.4 at s = 200 and 62 GeV • Calibrations of east FPD complete for s = 200 GeV data • Results will probe the highest xF at s = 200 and 62 GeV Status of Ongoing Run-6 Analysisp + p  p0 + X, s = 200 GeV

  13. More Onging Analysis • Inclusive pi0 cross section & ALL • Charged pion ALL • Di-hadron correlations (BEMC-EEMC-FPD) • Lambda DLL 0 ‘s from 2 in EEMC+SMD 2005 pp data for ++ and -- spin states 0 ‘s from 2 in BEMC+SMD

  14. Run7 STAR BUR 1st) AuAu 200GeV ~13weeks 2nd) dAu 200GeV ~10weeks

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