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A heuristic description of high-p(T) hadron production in heavy ion collisions

Nemchik, Jan; Pasechnik, Roman LU and Potashnikova, Irina (2015) In European Physical Journal C. Particles and Fields 75(2).
Abstract
Using a simplified model for in-medium dipole evolution accounting for color filtering effects we study the production of hadrons at large transverse momenta p(T) in heavy ion collisions. In the framework of this model, several important sources of the nuclear suppression observed recently at RHIC and LHC have been analyzed. A short production length of the leading hadron l(p) causes a strong onset of color transparency effects, manifesting themselves as a steep rise of the nuclear modification factor RAA(p(T)) at large hadron p(T). The dominance of quarks with higher l p leads to a weaker suppression at RHIC than the one observed at LHC. In the RHIC kinematic region we include an additional suppression factor, steeply falling with p(T),... (More)
Using a simplified model for in-medium dipole evolution accounting for color filtering effects we study the production of hadrons at large transverse momenta p(T) in heavy ion collisions. In the framework of this model, several important sources of the nuclear suppression observed recently at RHIC and LHC have been analyzed. A short production length of the leading hadron l(p) causes a strong onset of color transparency effects, manifesting themselves as a steep rise of the nuclear modification factor RAA(p(T)) at large hadron p(T). The dominance of quarks with higher l p leads to a weaker suppression at RHIC than the one observed at LHC. In the RHIC kinematic region we include an additional suppression factor, steeply falling with p(T), which is tightly related to the energy conservation constraints. This is irrelevant at LHC up to p(T) less than or similar to 70 GeV, while it causes a rather flat p(T) dependence of the R-AA(p(T)) factor at RHIC c. m. energy root s = 200 GeV and even an increasing suppression with p(T) at root s = 62 GeV. The calculations contain only a medium density adjustment, and for an initial time scale t0 = 1 fmwe found the energy-dependent maximal values of the transport coefficient, (q) over cap (0) = 0.7, 1.0, and 1.3GeV(2)/fm, corresponding to root s = 62, 200 GeV, and 2.76 TeV, respectively. We present a broad variety of predictions for the nuclear modification factor and the azimuthal asymmetry, which are well in agreement with available data from experiments at RHIC and LHC. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
European Physical Journal C. Particles and Fields
volume
75
issue
2
publisher
Springer
external identifiers
  • wos:000354547100001
  • scopus:84924115033
ISSN
1434-6044
DOI
10.1140/epjc/s10052-015-3319-7
language
English
LU publication?
yes
id
978b1011-97f1-4395-922d-4fca6694cec8 (old id 7424861)
date added to LUP
2015-06-26 08:16:27
date last changed
2017-01-01 05:52:57
@article{978b1011-97f1-4395-922d-4fca6694cec8,
  abstract     = {Using a simplified model for in-medium dipole evolution accounting for color filtering effects we study the production of hadrons at large transverse momenta p(T) in heavy ion collisions. In the framework of this model, several important sources of the nuclear suppression observed recently at RHIC and LHC have been analyzed. A short production length of the leading hadron l(p) causes a strong onset of color transparency effects, manifesting themselves as a steep rise of the nuclear modification factor RAA(p(T)) at large hadron p(T). The dominance of quarks with higher l p leads to a weaker suppression at RHIC than the one observed at LHC. In the RHIC kinematic region we include an additional suppression factor, steeply falling with p(T), which is tightly related to the energy conservation constraints. This is irrelevant at LHC up to p(T) less than or similar to 70 GeV, while it causes a rather flat p(T) dependence of the R-AA(p(T)) factor at RHIC c. m. energy root s = 200 GeV and even an increasing suppression with p(T) at root s = 62 GeV. The calculations contain only a medium density adjustment, and for an initial time scale t0 = 1 fmwe found the energy-dependent maximal values of the transport coefficient, (q) over cap (0) = 0.7, 1.0, and 1.3GeV(2)/fm, corresponding to root s = 62, 200 GeV, and 2.76 TeV, respectively. We present a broad variety of predictions for the nuclear modification factor and the azimuthal asymmetry, which are well in agreement with available data from experiments at RHIC and LHC.},
  articleno    = {95},
  author       = {Nemchik, Jan and Pasechnik, Roman and Potashnikova, Irina},
  issn         = {1434-6044},
  language     = {eng},
  number       = {2},
  publisher    = {Springer},
  series       = {European Physical Journal C. Particles and Fields},
  title        = {A heuristic description of high-p(T) hadron production in heavy ion collisions},
  url          = {http://dx.doi.org/10.1140/epjc/s10052-015-3319-7},
  volume       = {75},
  year         = {2015},
}