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

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Run-10 Medium-Energy Running Update Stefan Bathe for PHENIX RHIC Machine-Experiment Meeting 3/30/2010

Excellent 62 GeV Both RHIC & PHENIX 03/16/2009RHIC Machine/Experiment Meeting2 Delivered (PHENIX on) Recorded (PHENIX on) Original goal after 4 weeks Time between Stores (with PHENIX DAQ live [minutes] Time between Runs (with PHENIX DAQ live [minutes] Run # consecutive Run # not consecutive 50 minutes 2 minutes Performance twice better than expected  375 M / 400 M events after 12/28 days What to do with this?

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 03/16/2009RHIC Machine/Experiment Meeting3

J/ψ Meaurement 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 GeV Cu+Cu)

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 03/16/2009RHIC Machine/Experiment Meeting5

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) 03/16/2009RHIC Machine/Experiment Meeting6 How do dilepton excess and ρ modification at SPS evolve into the large low-mass excess at RHIC?

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? 03/16/2009RHIC Machine/Experiment Meeting7