Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition

Parity doubling of nucléons, Delta and Omega baryons across the deconfinement phase transition
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核子、Delta 和 Omega 重子在解禁闭相变过程中宇称倍增

DOI:
10.1051/epjconf/201713707004
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发表时间:
2017
影响因子:
--
通讯作者:
Aarts G
Aarts G
中科院分区:
--
文献类型:
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作者:
Aarts G

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在这项工作中,我们用格子QCD分析了核子(自旋1/2八重态)、Δ重子和Ω重子(自旋3/2十重态)的正负宇称通道。在自然界中,在零温度下,手征对称性自发破缺,导致正负宇称基态具有不同的质量。然而,手征对称性有望在交叉温度附近恢复(对于无质量夸克),这意味着两个相反的宇称通道应该简并。在这里,我们研究在既包括强子相又包括夸克胶子等离子体(QGP)相的温度范围内发生的事情。通过指数拟合法和最大熵方法对关联函数和谱函数的分析,我们发现核子和Δ重子通道在QGP相中的宇称倍增。对于Ω重子,我们看到了在交叉温度下宇称加倍的明显信号,但这并不完全,这是由于非零的奇异夸克质量。此外,强子相中的介质效应对于所有三个重子都是明显的,特别是对于负宇称基态。这可能会对强子共振气体模型产生影响。在这项工作中,我们使用了FASTSUM各向异性Nf=2+1系综。
In this work we analyse positive- and negative-parity channels for the nucleón (spin 1/2 octet), Δ and Ω baryons (spin 3/2 decuplet) using lattice QCD. In Nature, at zero temperature, chiral symmetry is spontaneously broken, causing positive- and negative-parity ground states to have different masses. However, chiral symmetry is expected to be restored (for massless quarks) around the crossover temperature, implying that the two opposite parity channels should become degenerate. Here we study what happens in a temperature range which includes both the hadronic and the quark gluon plasma (QGP) phase. By analysing the correlation and spectral functions via exponential fits and the Maximum Entropy Method respectively, we have found parity doubling for the nucleon and Δ baryon channels in the QGP phase. For the Ω baryon we see a clear signal of parity doubling at the crossover temperature, which is however not complete, due to the nonzero strange quark mass. Moreover, in-medium effects in the hadronic phase are evident for all three baryons, in particular for the negative-parity ground states. This might have implications for the hadron resonance gas model. In this work we used the FASTSUM anisotropicNf=2 + 1 ensembles.
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