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arXiv 1707.03559hep-ph
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B系统中瞬子效应的探讨

An approach to the instanton effect in B system

Noriaki Kitazawa, Yuki Sakai

摘要:

讨论了低能有效理论中QCD瞬子效应大小的限制。在介子质量谱和动力学中的各种瞬子效应中,我们集中讨论了轻夸克的瞬子诱导质量。著名的瞬子诱导的六夸克相互作用,即所谓的特胡夫特顶点,可以对轻夸克质量进行非微扰量子修正。人们已经做了许多工作来限制轻介子系统或π、K、η和η '系统中的质量修正,现在我们知道上夸克的瞬子诱导质量太小,不能通过使上夸克的流质量为零来实现强CP问题的解决。本文给出了由重介子B ~+、B_0、Bs及其反粒子的质量谱对轻夸克的瞬子诱导质量修正的一个约束条件。为此,在重介子有效理论中确定了完整的二阶手征对称性破缺项。我们发现重介子质量的约束强度与轻介子质量的约束强度处于同一水平,并且通过未来B工厂和晶格计算的更精确数据,它将变得更强。

英文摘要:

We discuss the constraint on the size of QCD instanton effects in low-energy effective theory. Among various instanton effects in meson mass spectrum and dynamics, we concentrate on the instanton-induced masses of light quarks. The famous instanton-induced six-quark interaction, so-called 't Hooft vertex, could give non-perturbative quantum corrections to light quark masses. Many works have already been achieved to constrain the mass corrections in light meson system, or the system of pi, K, eta and eta', and now we know for a fact that the instanton-induced mass of up-quark is too small to realize the solution of the strong CP problem by vanishing current mass of up-quark. In this work we give a constraint on the instanton-induced mass correction to light quarks from the mass spectrum of heavy mesons, B+, B0, Bs and their anti-particles. To accomplish this, the complete second order chiral symmetry breaking terms are identified in heavy meson effective theory. We find that the strength of the constraint from heavy meson masses is at the same level of that from light mesons, and it would be made even stronger by more precise data from future B factories and lattice calculations.

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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