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Line shape of phi meson at 62.4GeV Au+Au Collisions

Line shape of phi meson at 62.4GeV Au+Au Collisions. Outlines: 1.Motivations 2.Dataset, cuts and method 3.Phi signal reconstruction 4.Centroid and width with centrality 5.Conclusion and outlook. Shengli Huang Vanderbilt University. Motivations(I). ->k + k  at 200GeV Au+Au collision

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Line shape of phi meson at 62.4GeV Au+Au Collisions

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  1. Line shape of phi meson at 62.4GeV Au+Au Collisions Outlines: 1.Motivations 2.Dataset, cuts and method 3.Phi signal reconstruction 4.Centroid and width with centrality 5.Conclusion and outlook Shengli Huang Vanderbilt University Shengli Huang

  2. Motivations(I) ->k+k at 200GeV Au+Au collision PHENIX, PRC72(014903),2005 1.The line shape of  meson is consistent with PDG 2. = 46 fm/c,QGP~10 fm/c  small fraction of  decays inside fireball producing a very small modification in the line shape. Shengli Huang

  3. Motivations(II) ->e+e at 12GeV p+A Dot line:background Solid line:fit results with the simulation shape R.Muto et al., Nucl. Sci. A774(2006)723-726 1.Mass shift is observed for the low velocity  meson at p+Cu collision while not p+C collision 2.How about 62GeV Au+Au Collision? Shengli Huang

  4. The dataset, cuts and methods • Dataset: 62.4GeV Au+Au: • Centrality:0~83.7% • |VertexZ|<30cm • Total events~ 34M • Mixing event methods: • 8 centrality bins • 6 VertexZ bins • 10 mixing events • Normalization methods: • 1)Nevents/Nmixevents • 2)2*sqrt(N++N--)/N+-(mix) • 3)Ratio of integral yield (m0>1.10GeV) of invariant mass distribution in same and mixing events Kaon identification Shengli Huang

  5. The ->k+k- signal reconstruction • Min-Bias • Fit Function: Breit-Wigner • with Gaussian mass resolution • of 1.4MeV • Width: • 4.61 ± 0.46(sta) ±0.58(sys)MeV • Centroid: • 1.0200±0.0002(sta) ±0.0009(sys)GeV • Consistent with PDG value pT :1~3GeV/c Shengli Huang

  6. The centrality dependence of  signal (I) 1. Centrality bins: 0~10% 10~20% 20~40% 40~60% 60~83.7% 2.PT cut:1~3GeV Shengli Huang

  7. The centrality dependence of  signal (II) Shengli Huang

  8. The centrality dependence of centroid & width Systematic error Width: magnet uncertainty Centroid: different normalized methods The centroid and width of  meson do not depend on centrality Shengli Huang

  9. Conclusions/Outlook 1.The signal of  meson in 62.4GeV Au+Au collision has been reconstructed from k+k decay channel. 2.The centroid & width of  meson do not show centrality dependence and consistent with the PDG value 3.In the future, the yield of  meson from k+k decay channel will be studied Shengli Huang

  10. The Phi signal Centroid & Width 3.Integral:4.03 ± 0.44MeV 1.Akiba: 4.61±0.46MeV • Min-Bias • Width: • 4.61 ± 0.46(sta) ±0.58(sys)MeV • Centroid: • 1.020±0.0002(sta) ±0.0009(sys)GeV • Consistent with PDG value 2.Hemmick:4.93 ± 0.47MeV Shengli Huang

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