1 / 1

EMCal resolution 450 ps

Measurements of the f ->K + K - with PHENIX in Au+Au Collisions at 200 GeV at RHIC Charles F. Maguire Vanderbilt University (for the PHENIX collaboration). p / K Separation in TOF up to 2 GeV/c K/p Separation in TOF up to 4 GeV/c. PHENIX Particle Identification for   , K  , and p .

billy
Download Presentation

EMCal resolution 450 ps

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. Measurements of the f->K+K- with PHENIX in Au+Au Collisions at 200 GeV at RHICCharles F. MaguireVanderbilt University(for the PHENIX collaboration) p/K Separation in TOF up to 2 GeV/c K/p Separation in TOF up to 4 GeV/c PHENIX Particle Identification for , K, and p Theoretical Interest of the f in Collisions at RHIC EMCal resolution 450 ps Inclusive identified hadron spectra use TOF in East Armf->K+K- uses TOF-TOF, EMCal-EMCal, and TOF-EMCal in Eastf->e+e- uses RICH,EMCal-EMCal inEast-West, East-East, and West-West • Restoration of approximate chiral symmetry may modify the f mass and width in medium • Mass = 1019.456 +/- 0.020 MeVBreit-Wigner G = 4.26 +/- 0.06 MeV • Look for variations with centrality • Compare to p+p and d+A results • These modifications may result in a change in the branching fraction of fK+K- and fe+e- when the f decays in medium (tf~ 44 fm/c) • Compare different pair pT ranges • Final state interactions of kaons may lower the apparent measured branching fraction of fK+K- relative to fe+e- • Measure both channels in the same detector R. Rapp nucl-th/0204003 Actual Pairs Fit to a Relativistic BW shapeconvolved with a 1.20 MeV Gaussian Note the 1 MeV mass binning Mixed Event Calculated Background Conclusions for the Mass Centroid of the f in Au+Au collisions at 200 GeV Within the experimental error limits(sstat , sstat < 1 MeV) the f centroid mass value agrees with the PDG valueandthere is no dependence onthe centrality of the collision Conclusions for the Mass Width of the f in Au+Au collisions at 200 GeV Within the experimental error limits(sstat , sstat < 0.5 MeV) the f width value agrees with the PDG valueandthere is no dependence onthe centrality of the collision Conclusions for the f Yield in Au+Au Collisionsat 200 GeV The yield per participant saturates as a function of centralityThe Temperature is constant as a function of centrality 1) 2) momentum resolution p/p ~ 1%  1% p p K TOF resolution 120 ps p 3) fSignal Detected as K+K- Pairs in TOF-TOF fSignal Detectedas K+K- Pairs in TOF-EMCal Actual Pairs Relativistic Breit-Wigner convolved with a 1.2 MeV Gaussian Mixed Event Calculated Background Final results for the Line Shape and the Yields of the f as a Function of Centrality Combination of TOF-TOF, TOF-EMCal, and EMCal-EMCal Data: All Mutually Consistent The excellent single particle momentum resolution of the PHENIX spectrometer leads to a pair mass resolution of ~1.2 MeV, much less than the intrinsic width of the f .The good pair mass resolution enables us to set narrow constraints on the line shape. 4) 5)

More Related