Charm production in Pb plus Pb collisions at energies available at the CERN Large Hadron Collider

被引：130

作者：

Song, Taesoo ^{[1
,2
]}

Berrehrah, Hamza ^{[1
,2
]}

Cabrera, Daniel ^{[1
,2
]}

Cassing, Wolfgang ^{[3
]}

Bratkovskaya, Elena ^{[1
,2
]}

机构：

[1] Goethe Univ Frankfurt, Inst Theoret Phys, Robert Mayer Str 8, Frankfurt, Germany

[2] Goethe Univ Frankfurt, Frankfurt Inst Adv Studies, D-60054 Frankfurt, Germany

[3] Univ Giessen, Inst Theoret Phys, Giessen, Germany

来源：

PHYSICAL REVIEW C | 2016年 / 93卷 / 03期

关键词：

HEAVY FLAVOR;

D O I：

10.1103/PhysRevC.93.034906

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：

We study charm production in Pb + Pb collisions at root s(NN) = 2.76 TeV in the parton-hadron-string-dynamics (PHSD) transport approach and the charm dynamics in the partonic and hadronic medium. The charm quarks are produced through initial binary nucleon-nucleon collisions by using the PYTHIA event generator, taking into account the (anti-)shadowing incorporated in the EPS09 package. The produced charm quarks interact with off-shell massive partons in the quark-gluon plasma and are hadronized into D mesons through coalescence or fragmentation close to the critical energy density, and then interact with hadrons in the final hadronic stage with scattering cross sections calculated in an effective Lagrangian approach with heavy-quark spin symmetry. The PHSD results show a reasonable R-AA and elliptic flow of D mesons in comparison to the experimental data for Pb + Pb collisions at root s(NN) = 2.76 TeV from the ALICE Collaboration. We also study the effect of temperature-dependent off-shell charm quarks in relativistic heavy-ion collisions. We find that the scattering cross sections are only moderately affected by off-shell charm degrees of freedom. However, the position of the peak of R-AA for D mesons depends on the strength of the scalar partonic forces which also have an impact on the D meson elliptic flow. The comparison with experimental data on the R-AA suggests that the repulsive force is weaker for off-shell charm quarks as compared to that for light quarks. Furthermore, the effects from radiative charm energy loss appear to be low compared to the collisional energy loss up to transverse momenta of similar to 15 GeV/c.

引用

页数：12

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