Impact of the initial size of spatial fluctuations on the collective flow in Pb-Pb collisions at √SNN=2.76 TeV

被引：27
作者：
Konchakovski, V. P. [1 ]
Cassing, W. [1 ]
Toneev, V. D. [2 ]
机构：
[1] Univ Giessen, Inst Theoret Phys, D-35392 Giessen, Germany
[2] Joint Inst Nucl Res, Dubna 141980, Russia
来源：
JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS | 2015年 / 42卷 / 05期
关键词：
relativistic heavy-ion collisions; quark-gluon plasma; transport approach; LHC; Pb-Pb collisions; TRANSVERSE-MOMENTUM; ELLIPTIC FLOW; DEPENDENCE; DYNAMICS; PP; PARTICLES; SPS;
D O I：
10.1088/0954-3899/42/5/055106
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：
The Parton-Hadron-String-Dynamics transport model is used to study the influence of the initial size of spatial fluctuations of the interacting system on flow observables in Pb-Pb collisions at root S-NN = 2.76 TeV for different centralities. While the flow coefficients nu(2), nu(3), nu(4) and nu(5) are reasonably described in comparison to the data from the ALICE Collaboration for different centralities within the default setting, no essential sensitivity is found with respect to the initial size of spatial fluctuations even for very central collisions where the flow coefficients are dominated by the size of initial state fluctuations. We attribute this lack of sensitivity partly to the low interaction rate of the degrees-offreedom in this very early phase of order similar to 0.3 fm c(-1) which is also in common with the weakly interacting color glass condensate or glasma approach. Moreover, since the event shape in the transverse plane is approximately the same for different size of spatial fluctuations very similar eccentricities c(n) are transformed to roughly the same flow coefficients nu(n) in momentum space.
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页数：12
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