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arXiv 0811.2934hep-ph
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重离子碰撞喷流中多粒子产生的介质修正演化

Medium-modified evolution of multiparticle production in jets in heavy-ion collisions

Redamy Perez Ramos

摘要:

利用玩具QCD模型研究了重离子碰撞中夸克喷注和胶子喷注的平均多重数和多重数涨落的能量演化。在这个模型中,我们使用修改后的分裂函数来解释通过夸克-胶子等离子体传播的快部分子对胶子的中等增强辐射。软强子标准产生的主导贡献被因子$\sqrt{N_s}$增强,而次主导阶(NLO)修正被$1/\sqrt{N_s}$抑制,其中核参数$N_s>1$解释了热介质中诱导的软胶子.研究了次-主导阶数修正(NNLO)的作用,发现大量的介质诱导软胶子对微扰级数的收敛性有很大的影响。我们的结果进行了交叉检查,并与它们在真空中的极限进行了比较,并提出了一种求解第二多重相关演化方程的新方法。

英文摘要:

The energy evolution of medium-modified average multiplicities and multiplicity fluctuations in quark and gluon jets produced in heavy-ion collisions is investigated from a toy QCD-inspired model. In this model, we use modified splitting functions accounting for medium-enhanced radiation of gluons by a fast parton which propagates through the quark gluon plasma. The leading contribution of the standard production of soft hadrons is found to be enhanced by the factor $\sqrt{N_s}$ while next-to-leading order (NLO) corrections are suppressed by $1/\sqrt{N_s}$, where the nuclear parameter $N_s>1$ accounts for the induced-soft gluons in the hot medium. The role of next-to-next-to-leading order corrections (NNLO) is studied and the large amount of medium-induced soft gluons is found to drastically affect the convergence of the perturbative series. Our results for such global observables are cross-checked and compared with their limits in the vacuum and a new method for solving the second multiplicity correlator evolution equations is proposed.

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