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存在显式对称破缺相互作用的奇异夸克物质

Strange quark matter in the presence of explicit symmetry breaking interactions

J. Moreira, J. Morais, B. Hiller, A. A. Osipov, A. H. Blin

备注：
12 pages, 4 figures (11 subfigures). Revised and extended version. Accepted for publication in Phys. Rev. D
发表信息：
Phys. Rev. D 91, 116003 (2015)
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摘要：

结果表明，在夸克物质的广义3味Nambu-Jona-Lasinio（NJL）处理中，出现了与奇异夸克质量跃变有关的一阶跃迁。拉格朗日量的推广在$\frac{1}{N_c}$计数中显示了自旋0相互作用的前导和次前导级（LO和NLO）的完整集合，包括最近导出的NLO显式手征对称性破缺相互作用，它们与't Hooft味行列式具有相同的级。模型的参数受到赝标和标量介子扇区低能特性的严格约束。除了通常的与轻夸克扇区相关的手征跃迁外，跃迁还发生在中等化学势区域（$μ\simeq 400~\mathrm{MeV}$表示零温度）。这一特征的根源在于包含了明确的手征对称性破缺相互作用，因此，与只考虑非线性光学中的特胡夫特相互作用的传统模型相比，手征对称性破缺相互作用可以被看作是奇异夸克物质产生的催化剂。它可以追溯到不违反Okubo-Zweig-Iizuka规则（OZI）的相互作用的影响，没有它的标量（$m_{K^\star}< m_{a_0}\approx m_{f_0}$）的经验排序是不能复制的。

英文摘要：

It is shown that a first order transition associated with a jump in the strange quark mass appears in a generalized 3 flavour Nambu--Jona-Lasinio (NJL) treatment of quark matter. The generalization of the Lagrangian displays the complete set of spin 0 interactions at leading and subleading orders (LO and NLO) in $\frac{1}{N_c}$counting, including the recently derived NLO explicit chiral symmetry breaking interactions which are of the same order as the 't Hooft flavour determinant. The parameters of the model are tightly constrained by the low energy characteristics in both the pseudoscalar and scalar meson sectors. The transition occurs in a moderate chemical potential region ($μ\simeq 400~\mathrm{MeV}$ for zero temperature) in addition to the usual chiral transition associated with the light quark sector. This feature has at its root the inclusion of the explicit chiral symmetry breaking interactions, which therefore can be seen to act as a catalyst in the production of strange quark matter when compared to the conventional version of the model that takes only into account the 't Hooft interaction in the NLO. It can be traced back to the effect of the interactions which do not violate the Okubo-Zweig-Iizuka rule (OZI), without which the empirical ordering of the scalars ($m_{K^\star}< m_{a_0}\approx m_{f_0}$) is not reproduced.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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