BRAHMS Zhongbao Yin Department of Physics, University of Bergen for the BRAHMS Collaboration High p T Spectra of Protons and Charged Pions in Au+Au and.

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Presentation transcript:

BRAHMS Zhongbao Yin Department of Physics, University of Bergen for the BRAHMS Collaboration High p T Spectra of Protons and Charged Pions in Au+Au and d+Au Collisions at √s NN =200 GeV

BRAHMS ● High p T spectra ● High p T particle composition in Au+Au and d+Au collisions at both mid- and forward rapidity ● Nuclear medium effects: ● High p T suppression in Au+Au collisions ● Cronin effects at mid-rapidity in d+Au collisions ● Color Glass Condensate (CGC) effects at forward rapidity in d+Au collisions? Nuclear Modification Factor: Outline R Au = d 2 N/dp T d  (Au+Au) N Coll d 2 N/dp T d  (p+p)

BRAHMS The BRAHMS Experiment

BRAHMS Invariant Spectra of Charged Hadrons PRL 91 (2003) Reference spectrum : UA1 scaled to our acceptance h=0 h=2.2

BRAHMS Nuclear Modification Factors Suppression at  = 2.2 is similar to or stronger than that at  = 0.

BRAHMS R dA in d+Au Collisions PRL 91 (2003) High p T yield of charged hadrons is enhanced in d+Au collisions

BRAHMS Particle Identification ● TOFW at mid-rapidity ● 2 sigma cuts ● K/  separation up to 2 GeV/c ● p/K separation up to 3.3 GeV/c ● RICH, H1 and H2 at forward rapidity ● RICH: 3 sigma cuts K/  separation up to 18 GeV/c

BRAHMS Spectra for Charged Pions in Au+Au

BRAHMS Pions and Protons at Mid-Rapidity in Au+Au Collisions

BRAHMS Pions and Protons at  = 2.2 in Au+Au Collisions

BRAHMS Pion Spectra at  = 2.2 from d+Au

BRAHMS Ratios: (Anti-) Protons to Pions

BRAHMS Particle Composition from d+Au There is no centrality dependence.  - /h -,  =2.2

BRAHMS Systematics p/h + and pbar/h - at mid-rapidity Ratios of negatively charged pions and hadrons at forward rapidity  - /h -,  =2.2

BRAHMS Nuclear Modification Factor for Pions and Protons Neutral pion spectrum for p+p collisions measured by PHENIX is scaled to our rapidity range (-0.05 – 0.05) as reference spectrum for pions. Preliminary (anti-) proton spectrum for p+p collisions measured by STAR is used as reference spectrum for (anti-) protons.

BRAHMS Nuclear Modification Factor at Forward Rapidity ● Pythia + PHENIX neutral pion measurement for pp collisions at midrapidity ● Strong suppression at forward rapidity

BRAHMS Nuclear Modification Factor in d+Au Collisions High p T yields of pions are suppressed at forward rapidity in central d+Au collisions. Prediction from the talk by D. Kharzeev at the RIKEN- BNL Workshop on high p T physics at RHIC, 12/2- 6/2003.  -,  =2.2

BRAHMS Summary ● Suppression of high p T yields of charged hadrons and identified pions has been observed in Au+Au collisions at both mid-rapidity and forward rapidity. The suppression appears stronger at forward rapidity. ● Ratios of (anti-) proton to pion show an enhancement of (anti-) proton production in Au+Au collisions compared to p+p and d+Au collisions. ● High p T yields of pions are also suppressed in central d+Au collisions at forward rapidity. The more central the collisions, the stronger the suppression.

BRAHMS The BRAHMS Collaboration I. Arsene 10, I. G. Bearden 7, D. Beavis 1, C. Besliu 10, B. Budick 6, H. Bøggild 7, C. Chasman 1, C. H. Christensen 7, P. Christiansen 7, J. Cibor 4, R. Debbe 1, E. Enger 12, J. J. Gaardhøje 7, M. Germinario 7, K. Hagel 8, O. Hansen 7, H. Ito 1, 11, A. Jipa 10, F. Jundt 2, J. I. Jørdre 9, C. E. Jørgensen 7, R. Karabowicz 3, E. J. Kim 5, T. Kozik 3, T. M. Larsen 12, J. H. Lee 1, Y. K. Lee 5, S. Lindal 12, R. Lystad 9, G. Løvhøiden 2, Z. Majka 3, A. Makeev 8, B. McBreen 1, M. Mikelsen 12, M. Murray 8, 11, J. Natowitz 8, B. Neumann 11, B. S. Nielsen 7, J. S. Norris 11, D. Ouerdane 7, R. Planeta 4, F. Rami 2, C. Ristea 10, O. Ristea 10, D. Röhrich 9, B. H. Samset 12, D. Sandberg 7, S. J. Sanders 11, R. A. Scheetz 1, P. Staszel 7, T. S. Tveter 12, F. Videbæk 1, R. Wada 8, Z. Yin 9, I. S. Zgura 10 1 Brookhaven National Laboratory, USA 2 IReS and Université Louis Pasteur, Strasbourg, France 3 Jagiellonian University, Krakow, Poland 4 Institute of Nuclear Physics, Cracow, Poland 5 Johns Hopkins University, Baltimore, USA 6 New York University, USA 7 Niels Bohr Institute, University of Copenhagen, Denmark 8 Texas A&M University, College Station, USA 9 University of Bergen, Norway 10 University of Bucharest, Romania 11 University of Kansas, Lawrence, USA 12 University of Oslo Norway