Medium effects and parity doubling of hyperons across the deconfinement phase transition

Medium effects and parity doubling of hyperons across the deconfinement phase transition
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超子在解禁相变过程中的中等效应和宇称倍增

DOI:
10.1051/epjconf/201817507016
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发表时间:
2018
影响因子:
--
通讯作者:
Aarts G
Aarts G
中科院分区:
--
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作者:
Aarts G

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我们分析了超子的行为与奇异性S =-1,2,3在强子和夸克胶子等离子体阶段,特别感兴趣的宇称加倍和它的出现,随着温度的增长。这项研究使用我们的FASTSUM各向异性Nf = 2+1合奏,四个温度低于和四个以上的解除限制转变温度,Tc。正宇称基态质量被发现在很大程度上是温度无关低于Tc,而负宇称的显着减少,随着温度的升高。在接近跃迁处,质量几乎是简并的,与手征对称性恢复的预期一致。这可能对重离子现象学感兴趣。特别是,我们展示了这种效果的应用程序的强子共振气体模型。在所有超子通道中,在T以上都发现了明显的宇称加倍信号,其效应的强度取决于重子中s夸克的数量。
We analyse the behaviour of hyperons with strangenessS= –1,–2,–3 in the hadronic and quark gluon plasma phases, with particular interest in parity doubling and its emergence as the temperature grows. This study uses our FASTSUM anisotropicNf= 2+1 ensembles, with four temperatures below and four above the deconfinement transition temperature,Tc. The positive-parity groundstate masses are found to be largely temperature independent belowTc, whereas the negative-parity ones decrease considerably as the temperature increases. Close to the transition, the masses are almost degenerate, in line with the expectation from chiral symmetry restoration. This may be of interest for heavy-ion phenomenology. In particular we show an application of this effect to the Hadron Resonance Gas model. A clear signal of parity doubling is found aboveTcin all hyperon channels, with the strength of the effect depending on the number of s-quarks in the baryons.
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