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

This document provides an overview of the goals and priorities for Run-11 at .ANDY, including issues to resolve, progress made, and upcoming tasks. It also highlights the long-term goals of the project and the importance of establishing a measuring power for Drell-Yan production. The document concludes with a schematic of the detector for Run-11.

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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) Reminder of goals and priorities for run-11 L.C.Bland, for AnDY 15 March 2011 Time Meeting, BNL

  2. Integrated Luminosity Estimate to Date • 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)

  3. Issues and Plans • Issues • Resolve a few remaining single-channel issues • We are in “production” with a jet trigger >250M jet events recorded. • In coming week… • Increase per bunch intensity for IP2 bump removal? • Remove beam crossing angle at IP2? IP2 DX training yesterday • Complete ECal gain matching Progress made offline in last week • Commission ZDC trigger for local polarimetry. Holes fixed in last week • Commission scaler system for local polarimetry.

  4. 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

  5. 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.

  6. 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 • 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)

  7. Backup

  8. 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%)

  9. 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 See http://hena.lbl.gov/IP2/Business/status/<date> for pictures of progress

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