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A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV)

A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV). L.C.Bland, for AnDY 12 April 2011 Time Meeting, BNL. Local Polarimetry Event data analysis to tune parameters for scaler board.

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A N DY Status Commissioning with colliding beams (p  +p  at s=500 GeV)

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  1. ANDY StatusCommissioning with colliding beams (p+p at s=500 GeV) L.C.Bland, for AnDY 12 April 2011 Time Meeting, BNL

  2. Local PolarimetryEvent data analysis to tune parameters for scaler board • Events that pass a ZDC trigger (Blue-facing OR Yellow-facing) are analyzed. Similar information is available on scaler board (acquiring data at 9.38 MHz), although final tuning is required. • Uses ZDC shower maximum detector to reconstruct azimuth (f) for event. f is spin sorted, based on 7-bit bunch counter and polarization pattern. • N±(f) and N±(f+p) are combined in a cross ratio analysis and then fit by esin(f-f0).

  3. Fri. 8 April 1.451011/bunch Minimal impact on STAR,PHENIX IP2 collisions begin <3 hours after physics ON Higher Intensity for IP2 Collisions

  4. Integrated Luminosity Estimate to Date ~2mr crossing angle ~1.6mr crossing angle ~0mr crossing angle systematically increased thresholds for IP2 collisions • Presently, no accidentals correction (found to be large for ZDC). Singles rates from BBC are now scaled, following 20110302 access. • Requires calibration of effective cross section for BBC via vernier scan. • Jet analyzing power measurement sets goal of 10 / pb for run 11. • Establishing luminosity capability in run 11 is important for Drell Yan attempt in runs 12,13 (150 / pb in each run) Many thanks to C-A for increasing the threshold for IP2 collisions 8/1/2014 4

  5. Issues and Plans • We are in “production” with a jet trigger >660M jet events recorded. • In coming week… • Further increase per bunch intensity for IP2 bump removal? Present criteria couples IP2 collision start with CNI measurement, so fixes start time • Vernier scan at IP2? • Reduce IP2 b* during APEX? • Demonstrate reproducibility • Complete ECal gain matching Not much progress in past week. • Begin local polarimetry production. Scaler board and FPGA configurations in production. Final tuning required 8/1/2014 5

  6. Backup 8/1/2014 6

  7. Reminder of GoalsLong-term and run-11 • Goals of ANDY project: • Establish that large-xF low-mass dileptons from the Drell-Yan process can be discriminated from background in s=500 GeV p+p collisions • Measure the analyzing power for Drell-Yan production with sufficient statistical precision to test the theoretical prediction of a sign change for DY in relation to semi-inclusive deep inelastic scattering • Establish if robust detection of Drell-Yan dileptons at large xF and low mass requires magnetic analysis  critical for future facilities at RHIC 8/1/2014 7

  8. ANDY Prioritiesfor remainder of RHIC run-11 • Run-11 goals: • Establish the impact of a third IR on RHIC performance for p+p collisions at s=500 GeV- Demonstrate luminosity at IP2, as required for Drell-Yan sample in runs 12 (without magnet),13 (with magnet). Estimate that 150 / pb gives 104 large-rapidity di-electrons with M>4 GeV/c2 for p+p at s=500 GeV. Is this possible in a 10-week run? • Demonstrate calibration of HCal • Measure analyzing power for large xF jet production. Non-zero AN required for jets if Drell-Yan production has an analyzing power. Complete the measurement of the analyzing power for jet production. A non-zero AN for jets is a requirement for Drell-Yan to have non-zero analyzing power. Recent theoretical work establishes intrinsic interest in the jet analyzing power measurement. 8/1/2014 8

  9. Run11 AN(Jet) arXiv:1103.1591 jet AN measurements are required to clarify signs of quark/gluon correlators related to Sivers functions. arXiv:1011.2692v1 s=200 GeV from p+pp “new” Sivers function “old” Sivers function 200GeV Non-zero jet analyzing power essentially a prerequisite before proceeding to Drell Yan 8/1/2014 • Siver’s effect only (no collin’s effect contribution) • Need AN(Jet) measurements before DY • With ~10/pb & P=50%, AnDY run11 can measure AN(Jet) 9

  10. Estimates • At present threshold for IP2 collisions (average intensity < 0.901011/bunch), integrate ~200 / nb / fill • 2 fills/day has been achieved • Consequently, 12.5 days are required to get 5 / pb • Maximum possible integrated luminosity (IP2 collisions for entire fill) would yield ~700 nb/fill • One week at 2 fills/day would provide 5 / pb • Two weeks at 2 fills/day would provide 10 / pb

  11. Schematic of detector for Run-11 • Equipment in place: • HCal is two existing 9x12 modules from E864 (NIM406,227) • ECal are two small lead-glass modules from BigCal at JLab • BBC (from PHOBOS) and ZDC • Preshower is newly constructed scintillator arrays • Goals: • Establish impact of 3IR operation on PHENIX/STAR luminosity • Calibrate HCal • relative gain via cosmic-ray m • absolute energy scale via r,L,KS… • Measure hadronic backgrounds to benchmark simulations • Measure jet analyzing power (Lint~10 / pb, P=50%) 8/1/2014 11

  12. Trigger/DAQ electronics Left/right symmetric HCal Left/right symmetric ECal Blue-facing BBC Left/right symmetric preshower Beryllium vacuum pipe IP2 in January, 2011Run-11 Staging of ANDY 8/1/2014 12 See http://hena.lbl.gov/IP2/Business/status/<date> for pictures of progress

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