Examining a reduced jet-medium coupling in Pb plus Pb collisions at the Large Hadron Collider

被引：40

作者：

Betz, Barbara ^{[1
]}

Gyulassy, Miklos ^{[2
]}

机构：

[1] Goethe Univ Frankfurt, Inst Theoret Phys, D-60438 Frankfurt, Germany

[2] Columbia Univ, Dept Phys, New York, NY 10027 USA

来源：

PHYSICAL REVIEW C | 2012年 / 86卷 / 02期

关键词：

NUCLEUS-NUCLEUS COLLISIONS; QUARK-GLUON PLASMA; SUPPRESSION; QCD; PERSPECTIVE; MATTER;

D O I：

10.1103/PhysRevC.86.024903

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Recent data on the nuclear modification factor R-AA of jet fragments in 2.76 ATeV Pb + Pb collisions at the Large Hadron Collider (LHC) indicate that the jet-medium coupling in a quark-gluon plasma (QGP) is reduced at LHC energies and not compatible with the coupling deduced from data at the Relativistic Hadron Collider (RHIC). We estimate the reduction factor from a combined fit to the available data on R-AA (root s, p(T), b) and the elliptic flow upsilon(2)(root s, p(T), b) at root s = 0.2, 2.76 ATeV over a transverse momentum range p(T) similar to 10-100 GeV and a broad impact parameter, b, range. We use a simple analytic "polytrope" model (dE/dx = -kappa E(a)x(z)T(c)) to investigate the dynamical jet-energy loss model dependence. Varying a = 0-1 interpolates between weakly coupled and strongly coupled models of jet-energy dependence while z = 0-2 covers a wide range of possible jet-path dependencies from elastic and radiative to holographic string mechanisms. Our fit to LHC data indicates an approximate 40% reduction of the coupling kappa from RHIC to LHC and excludes energy-loss models characterized by a jet-energy exponent witha > 1/3. In particular, the rapid rise of R-AA with p(T) >= 10 GeV combined with the slow variation of the asymptotic upsilon(2)(p(T)) at the LHC rules out popular exponential geometric optics models (a = 1). The LHC data are compatible with 0 <= a <= 1/3 pQCD-like energy-loss models where the jet-medium coupling is reduced by approximately 10% between RHIC and LHC.

引用

页数：9

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