1 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Nuclear Induced Particle Suppression at Large-x F at RHIC J.H. Lee Physics Department Brookhaven National Laboratory.

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Presentation transcript:

1 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Nuclear Induced Particle Suppression at Large-x F at RHIC J.H. Lee Physics Department Brookhaven National Laboratory For BRAHMS Collaboration

2 Nov. 15 QM2006 Shanghai J.H. Lee (BNL)   At the RHIC energies, hard scattering processes at high-p T become important   Partons are expected to loose energy in the dense matter   Different rapidities provide different densities of the medium: Sensitive to the dynamics   “Dialing” initial condition channel   Largest medium effect at mid- rapidity (“Scale” to multiplicity)?   Rapidity dependent high-p T suppression factors: provide information on dynamical medium effect at fixed time y~0 high-y Rapidity Dependent High-p T Measurement BRAHMS NA49 AGS

3 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) R CP and R AuAu vs  for GeV D'Enterria '05

4 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) “High”-p T Particle Suppression at Forward rapidities Expected forward “enhanced” physics processes: –Shadowing, Gluon saturation, Phase-space constraint/Energy conservation … With competing physics processes: –Partonic energy loss, Multiple scattering, Recombination …

5 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Forward Tomography: Dynamics + Geometry G. Barnaföldi, Lévai, Papp, Fai: nucl-ph/ Shadowing+MS+Energy Loss “Extracted“ opacity indicate longitudinally traveling Protons see less colored field Not a prediction: Assuming rapidity independent suppression factor

6 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Particle Suppression due to Energy Conservation at Forward Rapidities/Large-x F Universal suppression mechanism at large x F seen in data for various reactions Expected no particles produced as x F  1 due to energy conservation; more multiple interactions (more gluon radiation) make the effect larger in nuclei “Sudakov suppression” Kopeliovich et al: PRC72 (2005) x F = 2p z /√s

7 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) “Extended” Longitudinal Scaling of Centrality dependence: R CP Npart Extended range of limiting fragmentation behavior on centrality dependence of particle production: Factorization of Centrality and Energy dependence PHOBOS: nucl-ex/

8 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) BRAHMS Data/Acceptance: p T vs x F at √s NN = 200 and 62 GeV FSMRS Strong p T -x F correlation due to limited spectrometer solid angle acceptance Measurements from BRAHMS Mid-Rapidity Spectrometer (MRS) and Forward Spectrometer (FS) “Dynamic” x F binning in p T 0.2 GeV/c R CP for centrality dependence in p T -x F : R CP (0-20/40-70%),(20-40/40-70%) √s NN = 200 GeV √s NN = 62 GeV

9 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) R CP (h - ) vs x F in Au+Au at √s NN = 200 and 62 GeV Rcp (0-20%) < Rcp (20-40%): Centrality dependent suppression in x F <0.6 More suppression as x F increases at fixed p T (0.3 ~ 2.2 GeV/c) For the soft Rcp increase and maximize at p T ~ 1 GeV/c Statistical errors only shown Systematic Uncertainties: 10% (p-to-p) + 10% (normalization) MRS, FS h-h-h-h-

10 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) R CP (h + ) vs x F in Au+Au at √s NN = 200 and 62 GeV MRS, FS h+h+h+h+

11 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) R CP (proton) vs x F in Au+Au at √s NN = 200 and 62 GeV MRS, FS p protons at high-x F at the kinematic range dominates form initial protons Yet similar behavior with h -

12 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Summary Nuclear modification factor Rcp for charges hadrons and proton for √s NN = 200 and 62 GeV: -Rcp decrease with x F at given p T -Scaling-like behavior with x F indicating Energy conservation might play a significant role in addition to dynamical suppression mechanism at forward region Constraint/input for more coherent/complete theoretical understanding on dynamics of particle suppression/production at RHIC

13 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Back-up Slides

14 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) R CP (h - ) in dAu Stronger dependence of R CP on x F R CP continuously increase with p T

15 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) Recombination model at high-x F in AuAu at 62 GeV R. Hwa and C. Yang: nucl-th/ Parton recombination without shower parton dominates forward particle production Loosening up kinematic limit and enhance particle production at high-x F for peripheral collisions Protons are more efficiently produced at large-xF (valence quark dominance)

16 Nov. 15 QM2006 Shanghai J.H. Lee (BNL) y vs x F X1X1 X2X2 y > 0 rapidity y