20-26 Feb. 2005 Lake Louise Eun-Joo Kim Parton energy loss, saturation, Parton energy loss, saturation, and recombination at BRAHMS and recombination at BRAHMS Eun-Joo Kim Eun-Joo Kim University of Kansas University of Kansas For the BRAHMS collaboration For the BRAHMS collaboration
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20-26 Feb. 2005 Lake Louise Eun-Joo Kim Parton energy loss, saturation, and recombination at BRAHMS Eun-Joo Kim University of Kansas For the BRAHMS collaboration.
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20-26 Feb. 2005 Lake LouiseEun-Joo Kim
Parton energy loss, saturation, Parton energy loss, saturation, and recombination at BRAHMSand recombination at BRAHMS
Eun-Joo KimEun-Joo KimUniversity of KansasUniversity of KansasFor the BRAHMS For the BRAHMS collaborationcollaboration
20-26 Feb. 2005 Lake LouiseEun-Joo Kim
Hard scattering at RHIC Hard scattering at RHIC
study modifications modifications of high pT production in AA, dA with respect to pp via Ncoll scaling to learn about QCD dynamics : QQuark GGluon PPlasma and/or CColor GGlass C Condensate
Parton dynamics in a dense system of gluons differs from pQCD parton saturation
CColor GGlass CCondensate (effective field theory of dense gluon systems) controls gluon density in hadron hadron collisions initial conditions for the QGPQGP ?
p/- ratios lower at forward rapidity while suppression persists? no significant difference between y=0 and y~1 flow/mass effect ?
Hwa & Yang : y=0 Greco & Ko : y=0
20-26 Feb. 2005 Lake LouiseEun-Joo Kim
Ratios at Ratios at ~3.2 in dAu, ~3.2 in dAu, pppp
roughly as many protons as pions at high pT at forward rapidity in dAu
indicate other processes besides parton fragmentation
significant difference
small excess
20-26 Feb. 2005 Lake LouiseEun-Joo Kim
summarysummary BRAHMS has measured rapidity dependent nuclear modification factors and particle ratios in AuAu, dAu, and pp collisions. In AuAu collisions at sNN=200GeV, - High pT suppression (mesons) observed at y ~ 0, 2.2, and 3.2. - No strong rapidity dependent suppression. - Suppression is smooth with energy at 63, 130, and 200GeV. In dAu collisions at sNN=200GeV, - significant reduction of the nuclear modification factor at
forward rapidity and this suppression increases with and the
centrality. Initial state can be described by parton saturation (CGC). Baryon vs. Meson : Production and Nuclear Modification - Recombination/Coalescence can give reasonable explanation at intermediate pT in AuAu and dAu collisions.
20-26 Feb. 2005 Lake LouiseEun-Joo Kim
I.Arsene10, I. G. Bearden7, D. Beavis1, C. Besliu10, B. Budick6, H. Bøggild7, C. Chasman1,
C.H.Christensen7,P. Christiansen7, J. Cibor3, R. Debbe1, E. Enger12, J. J. Gaardhøje7, M. Germinario7, K. Hagel8, H. Ito1, A.Jipa10, F. Jundt2, J. I. Jørdre9, C. E. Jørgensen7,
R. Karabowicz4, E. J. Kim1,11, T. Kozik4 ,T. M. Larsen12, J. H. Lee1, Y. K. Lee5, S. Lindal12,
R. Lystad9, G. Løvhøiden12, Z. Majka4, A. Makeev8, M. Mikelsen12, M. Murray8, 11, J. Natowitz8,
B. Neumann11, B. S. Nielsen7, D. Ouerdane7, R. Planeta4, F. Rami2, C. Ristea10, O. Ristea10,
D. Röhrich9, B. H. Samset12, D. Sandberg7, S. J. Sanders11, R. A. Scheetz1, P. Staszel7,
T. S. Tveter12, F. Videbæk1, R. Wada8, Z. Yin9, I. S. Zgura10
1 Brookhaven National Laboratory, Upton, New York, USA2 IReS and Université Louis Pasteur, Strasbourg, France
3 Institute of Nuclear Physics, Krakow, Poland4 Smoluchkowski Inst. Of Physics, Jagiellonian University, Krakow, Poland
5 Johns Hopkins University, Baltimore, USA6 New York University, New York, USA
7 Niels Bohr Institute, University of Copenhagen, Denmark8 Texas A&M University, College Station, Texas, USA
9 University of Bergen, Bergen, Norway 10 University of Bucharest, Romania
11 University of Kansas, Lawrence, Kansas, USA 12 University of Oslo, Oslo, Norway