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arXiv 1503.04820hep-thhep-ph
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全息QCD中的重子和手征对称性破缺

Baryon and chiral symmetry breaking in holographic QCD

Alexander Gorsky, Sven Bjarke Gudnason, Alexander Krikun

摘要:

研究了全息QCD中手征对称性破缺与重子的关系。在标量双基本场的平均值为非零的情况下,构造了一个具有单位重子荷的孤子,它与手征凝聚体是对偶的。我们得到了手征凝聚体与重子质量之间的关系,并清楚地发现,在大的手征凝聚体值时,全息孤子不再位于红外壁上。相反,它被分成两半,对称地位于左右味膜上。另一方面,我们发现夸克凝聚的局域值在孤子核中被抑制,这是重子内部部分手征对称性恢复的证据。

英文摘要:

We study the relationship between chiral symmetry breaking and baryons in holographic QCD. We construct a soliton with unit baryon charge in the presence of a nonzero mean value of the scalar bifundamental field, which is dual to the chiral condensate. We obtain a relation between the chiral condensate and the mass of the baryon and find in a clear-cut way that at large values of the condensate the holographic soliton is no longer located on the IR wall. Instead it is split into two halves, which are symmetrically located on the left and right flavor branes. On the other hand we find that the local value of the quark condensate is suppressed in the core of the soliton, which is evidence for a partial chiral symmetry restoration inside the baryon.

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