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arXiv 0909.2323hep-ph
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强SU(2)色场中重夸克对的产生

Enhanced heavy quark-pair production in strong SU(2) color field

P. Levai, V. Skokov

摘要:

研究了重离子碰撞早期的非微扰粲和底夸克对产生。在我们早期的工作之后,时间相关的研究是基于强非阿贝尔场中费米子对产生的动力学描述。我们引入了具有脉冲状时间演化的含时色电场,模拟了两个碰撞重离子的重叠。计算是在有限流夸克质量的SU(2)色模型中进行的。重夸克对的产额与轻夸克对和奇异夸克对的产额进行了比较。我们表明,场脉冲的持续时间的倒数决定了夸克对生产的效率。因此,我们没有看到预期的重夸克产生的抑制,如下从施温格公式恒定场,而是一个增强的重夸克生产在超相对论能量。我们将脉冲持续时间依赖的结果转化为碰撞能量依赖,并引入味道依赖的能量弦张力,它可以用于在RHIC和LHC能量的基于弦的模型计算。

英文摘要:

Non-perturbative charm and bottom quark-pair production is investigated in the early stage of heavy ion collisions. Following our earlier works, the time-dependent study is based on a kinetic description of fermion-pair production in strong non-Abelian fields. We introduce time-dependent chromo-electric external field with a pulse-like time evolution, which simulates the overlap of two colliding heavy ions. The calculations is performed in a SU(2) color model with finite current quark masses. Yields of heavy quark-pairs are compared to the ones of light and strange quark-pairs. We show that the small inverse duration time of the field pulse determines the efficiency of the quark-pair production. Thus we do not see the expected suppression for heavy quark production, as follows from the Schwinger formula for constant field, but rather an enhanced heavy quark production at ultrarelativistic energies. We convert pulse duration time-dependent results into collisional energy dependence and introduce flavour-dependent energy string tensions, which can be used in string based model calculations at RHIC and LHC energies.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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