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arXiv 2007.15690hep-phhep-lathep-thnucl-th
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重介子EFT相互作用中的开魅欧几里德关联函数

Open-charm Euclidean correlators within heavy-meson EFT interactions

Glòria Montaña, Olaf Kaczmarek, Laura Tolos, Angels Ramos

摘要:

基于实现重夸克自旋对称性的手征有效场论,利用有限温度自洽么正化方法提取热谱函数,首次计算了开魅欧几里德关联函数.在计算欧几里德关联函数时,引入全能量相关的开粲谱函数,得到了与格点量子色动力学在远低于跃迁退禁闭温度时得到的结果相似的结果。在接近或高于跃迁退禁闭温度的温度下的差异可能表明,在开粲谱函数中不存在的高能态,在这些温度下与格点量子色动力学关联函数的定量描述相关。事实上,我们发现,包括一个连续的散射状态改善了比较在小欧几里德时间,而差异仍然出现大的时间。

英文摘要:

The open-charm Euclidean correlators have been computed for the first time using the thermal spectral functions extracted from a finite-temperature self-consistent unitarized approach based on a chiral effective field theory that implements heavy-quark spin symmetry. The inclusion of the full-energy dependent open-charm spectral functions in the calculation of the Euclidean correlators leads to a similar behaviour as the one obtained in lattice QCD for temperatures well below the transition deconfinement temperature. The discrepancies at temperatures close or above the transition deconfinement temperature could indicate that higher-energy states, that are not present in the open-charm spectral functions, become relevant for a quantitative description of the lattice QCD correlators at those temperatures. In fact, we find that the inclusion of a continuum of scattering states improves the comparison at small Euclidean times, whereas differences still arise for large times.

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