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arXiv 1105.3940hep-phhep-exnucl-exnucl-th
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CERN上2.76 A TeV的Pb+Pb碰撞中的重子异常和强色场

Baryon anomaly and strong color fields in Pb+Pb collisions at 2.76A TeV at the CERN Large Hadron Collider

V. Topor Pop, M. Gyulassy, J. Barrette, C. Gale

摘要:

利用HIJING/BBbar v2.0重离子事件发生器,我们研究了在大型强子对撞机(LHC)能区中心Pb+Pb碰撞中预测的几种高部分子密度动力学效应的唯象结果.这些效应包括(1)部分子能量损失(dE/dx)引起的喷注猝灭,(2)强纵向色场(SCF)引起的奇异性和超子增强,(3)重子-反重子结(JJbar)环和SCF效应引起的重子-介子比增强。饱和/微喷流截止尺度p0(s)和有效弦张力kappa(s,A)受到我们以前对LHC p+p数据的分析和最近由ALICE合作报告的Pb+Pb碰撞带电多重性数据的约束。我们预测的强子味依赖(介子和重子)的核修改因子RAA(PT)$和强调的可能性,重子异常可以持续在LHC高达PT=10 GeV,远远超出了在RHIC能量中心Au+Au碰撞观察到的范围。

英文摘要:

With the HIJING/BBbar v2.0 heavy ion event generator, we explore the phenomenological consequences of several high parton density dynamical effects predicted in central Pb+Pb collisions at the Large Hadron Collider (LHC) energies. These include (1) jet quenching due to parton energy loss (dE/dx), (2) strangeness and hyperon enhancement due to strong longitudinal color field (SCF), and (3) enhancement of baryon-to-meson ratios due to baryon-anti-baryon junctions (JJbar) loops and SCF effects. The saturation/minijet cutoff scale p0(s)and effective string tension kappa(s,A) are constrained by our previous analysis of LHC p+p data and recent data on the charged multiplicity for Pb+Pb collisions reported by the ALICE collaboration. We predict the hadron flavor dependence (mesons and baryons) of the nuclear modification factor RAA(pT)$ and emphasize the possibility that the baryon anomaly could persist at the LHC up to pT=10 GeV, well beyond the range observed in central Au+Au collisions at RHIC energies.

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