Color transparency and suppression of high-pT hadrons in nuclear collisions
arXiv:1012.2854 · doi:10.1103/PhysRevC.83.021901
Abstract
The production length l_p of a leading (large z_h) hadron produced in hadronization of a highly virtual high-p_T parton is short because of the very intensive vacuum gluon radiation and dissipation of energy at the early stage of process. Therefore, the main part of nuclear suppression of high-p_T hadrons produced in heavy ion collisions is related to the survival probability of a colorless dipole propagating through a dense medium. This is subject to color transparency, which leads to a steep rise with p_T of the nuclear ratio R_{AA}(p_T), in good agreement with the recent data from the ALICE experiment at LHC, CERN. No adjustment, except the medium density is made, and the transport coefficient is found to be \hat q_0=0.8 GeV^2/fm. This is close to the value extracted from the analysis of RHIC data for J/Psi suppression, but is an order of magnitude smaller than the value found from jet quenching data within the energy loss scenario. Although the present calculations have a status of a postdiction, the mechanism and all formulas have been published, and are applied here with no modification, except the kinematics. At the same time, p_T-dependence of R_{AA} at the energy of RHIC is rather flat due to the suppression factor steeply falling with rising x_T, related to the energy conservation constraints. This factor is irrelevant to the LHC data, since x_T is much smaller.
arXiv comment5 pages, 3 figures, the version to appear in Phys. Rev. C
References in corpus (19)
- Evidence from d+Au measurements for final-state suppression of high hadrons in Au+Au collisions at RHIC
- Suppressed pi^0 Production at Large Transverse Momentum in Central Au+Au Collisions at sqrt(s_NN) = 200 GeV
- Elastic, Inelastic, and Path Length Fluctuations in Jet Tomography
- Induced Gluon Radiation in a QCD Medium
- Heavy-Quark Kinetics in the QGP at LHC
- Thermal Dileptons at LHC
- Heavy Ion Collisions at the LHC - Last Call for Predictions
- Nonperturbative Effects in Gluon Radiation and Photoproduction of Quark Pairs
- Bremsstrahlung of a Quark Propagating through a Nucleus
- Hadron Formation in Deep-Inelastic Positron Scattering in a Nuclear Environment
- Quantitative Constraints on the Transport Properties of Hot Partonic Matter from Semi-Inclusive Single High Transverse Momentum Pion Suppression in Au+Au collisions at sqrt(s_NN) = 200 GeV
- Nuclear Hadronization: Within or Without?
- Multiple Parton Scattering in Nuclei: Modified DGLAP Evolution for Fragmentation Functions
- Bulk matter evolution and extraction of jet transport parameter in heavy-ion collisions at RHIC
- Broadening of Transverse Momentum of Partons Propagating through a Medium
- Colour Screening, Quark Propagation in Nuclear Matter and the Broadening of the Momentum Distribution of Drell-Yan Pairs
- Transverse Momentum Broadening in Semi-inclusive DIS on Nuclei
- J/Psi production in nuclear collisions: measuring the transport coefficient
- Jet lag effect and leading hadron production
Cited by in corpus (7)
- Quenching of high-pT hadrons: Energy Loss vs Color Transparency
- Nuclear suppression of J/Psi: from RHIC to the LHC
- Survival of charmonia in a hot environment
- Jet energy loss in heavy ion collisions from RHIC to LHC energies
- A heuristic description of high-pT hadron production in heavy ion collisions
- Quenching of high-pT hadrons: a non-energy-loss scenario
- Physics of Large-x Nuclear Suppression