1 / 7

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).

helki
Télécharger la présentation

Run-10 Medium-Energy Running Update

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related