Hyperons in thermal QCD: A lattice view
Hyperons in thermal QCD: A lattice view
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DOI：
10.1103/physrevd.99.074503
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发表时间：
2018-12
影响因子：
5
通讯作者：
G. Aarts;C. Allton;D. Boni;B. Jager
中科院分区：
文献类型：
--
作者：
G. Aarts;C. Allton;D. Boni;B. Jager
强子共振气体（英语：Hadron resonance gas，HRG）是在极端条件下广泛使用的物质描述，例如在重离子现象学的背景下。HRG的常用实现在整个强子阶段使用真空强子质量，因此不包括可能的介质效应。在这里，我们调查这个问题，使用非微扰晶格模拟采用FASTSUM各向异性Nf=2+1合奏。我们研究八重态和十重态重子的命运随着温度的增加，特别是集中在积极和消极的宇称基态。虽然正宇称基态质量确实被认为是温度无关的，但在误差范围内，在负宇称通道中观察到强烈的温度依赖性。我们给出了一个简单的参数化，并制定了在介质HRG，这是特别有效的超子。宇称加倍被认为是出现在退禁闭阶段的水平，较重的s夸克的显着效果。这种过渡的通道依赖性进行了分析。
The hadron resonance gas (HRG) is a widely used description of matter under extreme conditions, e.g. in the context of heavy-ion phenomenology. Commonly used implementations of the HRG employ vacuum hadron masses throughout the hadronic phase and hence do not include possible in-medium effects. Here we investigate this issue, using nonperturbative lattice simulations employing the FASTSUM anisotropic Nf=2+1 ensembles. We study the fate of octet and decuplet baryons as the temperature increases, focussing in particular on the positive- and negative-parity groundstates. While the positive-parity groundstate masses are indeed seen to be temperature independent, within the error, a strong temperature dependence is observed in the negative-parity channels. We give a simple parametrisation of this and formulate an in-medium HRG, which is particularly effective for hyperons. Parity doubling is seen to emerge in the deconfined phase at the level of correlators, with a noticeable effect of the heavier s quark. Channel dependence of this transition is analysed.