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Run-10 Medium-Energy Running Update

Run-10 Medium-Energy Running Update. Stefan Bathe for PHENIX RHIC Machine-Experiment Meeting 3/30/2010. Excellent Performance @ 62 GeV Both RHIC & PHENIX. Original goal after 4 weeks. Delivered (PHENIX on). 50 minutes. Recorded (PHENIX on).

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Run-10 Medium-Energy Running Update

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  1. Run-10 Medium-Energy RunningUpdate Stefan Bathe for PHENIX RHIC Machine-Experiment Meeting 3/30/2010

  2. Excellent Performance @ 62 GeV Both RHIC & PHENIX Original goal after 4 weeks Delivered (PHENIX on) 50 minutes Recorded (PHENIX on) Time between Stores (with PHENIX DAQ live [minutes] 2 minutes Run # consecutive Run # not consecutive Time between Runs (with PHENIX DAQ live [minutes] • Performance twice better than expected • 375 M / 400 M events after 12/28 days • What to do with this? RHIC Machine/Experiment Meeting

  3. Proposal—Part 1 • End 62.4 GeV run one week early (after 3 weeks) • What do we get? • About 600 M minimum bias events • Will assure good data set for HBD dilepton measurement • Measurement of J/ψ suppression to test recombination models • Saves one week of running time RHIC Machine/Experiment Meeting

  4. J/ψMeaurement at 62 GeV • Expect about 80 J/ψ per 100 M min. bias events (both muon arms combined) • In three weeks of running • 600 M min. bias events (recorded) • 500 J/ψ • Measure J/ψ suppression at 62.4 GeV • Recombination models (Rapp et al.) • J/ψ yield at 200 GeV dominated by recombination • predict much larger suppression at 62 GeV than at 200 GeV • J/ψ yield down 1/3 at 62 GeV • Recombination down 1/10 • Extremely interesting test of recombination models • From 50 M min. bias events • # of J/ψ consistent w/ expectation (from 62 GeVCu+Cu)

  5. Proposal—Part 2 • What to do with the saved week? • Proposal to add it to 39 GeV part of run • What will that gain us? • HBD dilepton measurement that was not thought to be possible at time of PAC Meeting RHIC Machine/Experiment Meeting

  6. Dilepton Measurement at 39 GeV • Adding 1 week increases running time by 2/3 (1.5 weeks  2.5 weeks) • Previous estimate: record 50 M min. bias events • Updated estimate: record 200 M min. bias events • excellent performance and increased running time • 30 M per day at 62 GeV; E^2 scaling: 12 M at 39 GeV • Will allow dilepton measurement with HBD at 39 GeV(not thought possible at time of PAC meeting) How do dilepton excess and ρ modification at SPS evolve into the large low-mass excess at RHIC? RHIC Machine/Experiment Meeting

  7. Summary of Proposal • End 62 GeV run one week early • Measurement of J/ψ suppression at 62 GeV to test recombination models • 500 J/p from 600 M minimum bias events in 3 weeks • Use available week for 39 GeV run • Dilepton measurement at 39 GeV with HBD • 200 M events in 2.5 weeks • How do dilepton excess and modification at SPS evolve into large low-mass excess at RHIC? RHIC Machine/Experiment Meeting

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