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Thermal Model at RHIC: Multiple Sources Analysis

Investigating if there is one thermal source or many at RHIC using a grand canonical ensemble and multiple sources concept to describe quark mixtures. Analyzing rapidity dependence of temperature and chemical potential. Conclusions drawn from fitting data to theoretical model.

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Thermal Model at RHIC: Multiple Sources Analysis

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  1. Is there one thermal source or many @ RHIC I.G. Bearden7, D. Beavis1, C. Besliu10, Y. Blyakhman6, J.Brzychczyk4, B. Budick6, H. Bøggild7 ,C. Chasman1, C. H. Christensen7, P. Christiansen7,J.Cibor4, R.Debbe1, J. J. Gaardhøje7,M. Germinario7,K. Grotowski4 , K. Hagel8, O. Hansen7, B. Harris11 , A.K. Holme12, H. Ito11, E. Jacobsen7, A. Jipa10, J. I. Jordre10, F. Jundt2, C.E.Jørgensen7, T. Keutgen9, E. J. Kim5, T. Kozik3, T.M.Larsen12, J. H. Lee1, Y. K.Lee5, G. Løvhøjden2, Z. Majka3, A. Makeev8, B. McBreen1, M. Murray11, J. Natowitz8, B.S.Nielsen7, K. Olchanski1, D. Ouerdane7, R.Planeta4, F. Rami2, D. Roehrich9, B. H. Samset12, S. J. Sanders11, I. S. Sgura10, R.A.Sheetz1, Z.Sosin3, P. Staszel7, T.S. Tveter12, F.Videbæk1, R. Wada8 and A.Wieloch3 1BNL, 2Strasbourg,3Jagiellonian University,, 4INP, Krakov, 5Johns Hopkins, 6CUNY 7Niels Bohr,8Texas A&M, 9Bergen, 10Bucharest,11Kansas,12 Oslo Michael Murray University of Kansas

  2. 95° 30° 2.3° 30° 15° The BRAHMS Experiment Michael Murray University of Kansas

  3. Thermal Model (Becattini) • Use a grand-cononical ensemble to describe the mixture of u,d and s quarks. • Conserve strangeness & electic charge • Hadronization based on quark ratios • Include weak decays of all resonances. Michael Murray University of Kansas

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  8. Minimze 2 by searching over B and T 2 Michael Murray University of Kansas

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  12. Rapidity Dependence of Temperature and Chemical Potential Michael Murray University of Kansas

  13. Picture will be clearer when final data are used Fit to dN/dy and volume directly Use a grid that extends to T=185MeV or so. Thermal model with multiple sources gives a reasonable description of our data. This hints that strangeness is locally conserved Temperature and µB increase with rapidity. Conclusions Michael Murray University of Kansas

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