TY - JOUR
T1 - Parton saturation and Npart scaling of semi-hard processes in QCD
AU - Kharzeev, Dmitri
AU - Levin, Eugene
AU - McLerran, Larry
N1 - Funding Information:
E.L. thanks the DESY Theory Division for the hospitality. The work of D.K. and L.M. is supported by the US Department of Energy under Contract DE-AC02-98CH10886. This research was supported in part by the BSF grant No. 9800276, by the GIF grant No. I-620-22.14/1999, and by the Israel Science Foundation, founded by the Israeli Academy of Science and Humanities.
PY - 2003/5/22
Y1 - 2003/5/22
N2 - We argue that the suppression of high pt hadrons discovered recently in heavy ion collisions at RHIC may be a consequence of saturation in the color glass condensate. We qualitatively and semi-quantitatively describe the data, in particular, the dependence upon the number of nucleon participants. We show that if parton saturation sets in at sufficiently small energy, then in nucleus-nucleus collisions at RHIC and LHC energies the cross sections of semi-hard processes should scale approximately with the number of participants, Npart. Our results provide a possible explanation of both the absence of apparent jet quenching at SPS energies and its presence at RHIC. Under the same assumption we predict that in semi-central and central pA (dA) collisions at collider energies the dependence of semi-hard processes on the number of participating nucleons of the nucleus will change to ∼ (NpartA)1/2. The forthcoming data on dA collisions will provide a crucial test of this description.
AB - We argue that the suppression of high pt hadrons discovered recently in heavy ion collisions at RHIC may be a consequence of saturation in the color glass condensate. We qualitatively and semi-quantitatively describe the data, in particular, the dependence upon the number of nucleon participants. We show that if parton saturation sets in at sufficiently small energy, then in nucleus-nucleus collisions at RHIC and LHC energies the cross sections of semi-hard processes should scale approximately with the number of participants, Npart. Our results provide a possible explanation of both the absence of apparent jet quenching at SPS energies and its presence at RHIC. Under the same assumption we predict that in semi-central and central pA (dA) collisions at collider energies the dependence of semi-hard processes on the number of participating nucleons of the nucleus will change to ∼ (NpartA)1/2. The forthcoming data on dA collisions will provide a crucial test of this description.
UR - http://www.scopus.com/inward/record.url?scp=0038710702&partnerID=8YFLogxK
U2 - 10.1016/S0370-2693(03)00420-9
DO - 10.1016/S0370-2693(03)00420-9
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AN - SCOPUS:0038710702
SN - 0370-2693
VL - 561
SP - 93
EP - 101
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1-2
ER -