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arXiv 1606.06211hep-phhep-latnucl-th
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从复格点量子色动力学势研究介质中的P波夸克偶素

In-medium P-wave quarkonium from the complex lattice QCD potential

Yannis Burnier, Olaf Kaczmarek, Alexander Rothkopf

摘要:

我们将基于格点量子色动力学势的研究arXiv:1509.07366(JHEP 1512(2015)101)中重夸克束缚态的介质性质扩展到P波底偶素和粲偶素。与S波通道中发现的行为相似,它们的光谱显示出特征性的加宽,以及随着温度的升高质量向较低能量的转移。与S波状态相反,即使在连续阈值低于束缚态残余质量的温度下,有限的角动量也会导致光谱峰的存活。我们详细阐述了随后的挑战,在定义夸克偶素溶解,目前估计的熔化温度的自旋平均$χ_b$和$χ_c$状态和对比的结果,最近的直接晶格NRQCD研究的P波夸克偶素。作为对重离子碰撞的应用,我们估计了通过冻结后的P波态的反馈对S波夸克偶素的贡献。

英文摘要:

We extend our lattice QCD potential based study arXiv:1509.07366 (JHEP 1512 (2015) 101) of the in-medium properties of heavy quark bound states to P-wave bottomonium and charmonium. Similar to the behavior found in the S-wave channel their spectra show a characteristic broadening, as well as mass shifts to lower energy with increasing temperature. In contrast to the S-wave states, finite angular momentum leads to the survival of spectral peaks even at temperatures, where the continuum threshold reaches below the bound state remnant mass. We elaborate on the ensuing challenges in defining quarkonium dissolution, present estimates of melting temperatures for the spin averaged $χ_b$ and $χ_c$ states and contrast the findings to recent direct lattice NRQCD studies of P-wave quarkonium. As an application to heavy-ion collisions we estimate the contribution of feed down to S-wave quarkonium through the P-wave states after freezeout.

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