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Day-One Physics: PHOBOS Mark Baker George Stephans

Day-One Physics: PHOBOS Mark Baker George Stephans. Ready for full physics program on Day 1. Expect many physics results in Year 1. Very simple run plan in Year 1. Minimal impact on RHIC scheduling. PHOBOS Full Day 1 Configuration. Full PHOBOS detector 2 spectrometer arms

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Day-One Physics: PHOBOS Mark Baker George Stephans

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  1. Day-One Physics: PHOBOSMark BakerGeorge Stephans • Ready for full physics program on Day 1. • Expect many physics results in Year 1. • Very simple run plan in Year 1. • Minimal impact on RHIC scheduling. RHIC Endgame Baker/Stephans

  2. PHOBOSFull Day 1 Configuration • Full PHOBOS detector • 2 spectrometer arms • multiplicity/vertex detector • 2 TOF-wall segments • NO planned Additional Equipment • READY for full physics program Day 1 = 01-OCT-1999 RHIC Endgame Baker/Stephans

  3. PHOBOSYear 1 AuAu Physics Program Year 1 = FY2000 (until summer shutdown) • Minimum-bias AuAu @ full energy • Goal: Collect the maximum # of events with as little trigger bias as possible. • 70% centrality cut & -20 cm<ZVTX<15 cm • sample very loose interaction triggers • sample beam crossing events RHIC Endgame Baker/Stephans

  4. PHOBOS Physics Goals Study QCD confinement and vacuum • Typical physics topics: • Look for Excess Entropy • Multiplicity distributions and fluctuations • Source Size & Lifetime (HBT) • Look for collective phenomena (over large V) • Identified spectra at low pT • Look for unusual medium effects • Phi mass and width Year 1 Yes Yes Yes 1st look RHIC Endgame Baker/Stephans

  5. PHOBOSYear 1 AuAu Physics Program • Measurement & centrality dependence of: • Event-by-event charged multiplicity • N, dN/dh, d2N/dhdf distributions • dN/dh, d2N/dhdf correlations & fluctuations • Identified particle correlations • e.g. Bose-Einstein (HBT) • Inclusive identified spectra, stressing low pT • d2N/dy dmT distributions RHIC Endgame Baker/Stephans

  6. PHOBOSYear 1 AuAu Physics Program • First look at: • Analysis of f mass and width • emphasis on low pT • Decaying particle spectra, such as Ls • emphasis on low pT RHIC Endgame Baker/Stephans

  7. PHOBOSYear 1 Beam Request • Majority of running with full energy Au-Au • As much variety as early as possible: • A-A (lighter species) • p-p at same E/A as the Au beam • p-Au (Au moving clockwise from above) • Au-p (Au moving counter-clockwise) • Au-Au at lower energy RHIC Endgame Baker/Stephans

  8. PHOBOSYear 1 Access Request • Accesses are quick and easy • No (or minimal) shielding work needed. • No PHOBOS-specific planned access needed • Almost all accesses should coincide with planned down time for RHIC or other detector. • Request: When possible, long beam-down times should be scheduled well in advance. RHIC Endgame Baker/Stephans

  9. Conclusions • PHOBOS plans to be ready on Day 1. • PHOBOS expects lots of physics in year 1. • Simple run plan for year 1: • Run RHIC and PHOBOS as much as possible • Take as many events as possible • Request beam variety during first two years. RHIC Endgame Baker/Stephans

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