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arXiv 0910.4880hep-ph
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手征微扰理论中SU(2)-和SU(3)-LEC的关系

Relations between SU(2)- and SU(3)-LECs in chiral perturbation theory

Juerg Gasser, Christoph Haefeli, Mikhail A. Ivanov, Martin Schmid

摘要:

双味区的手征微扰理论允许在奇夸克质量比外动量和轻夸克质量m_u和m_d大的极限下分析QCD中的格林函数。在此框架下,SU{2}_R \times SU{2}_L的低能常数依赖于重夸克质量的大小.对于手征展开式中p^2和p^4阶的耦合常数,我们在双圈精度下求出了它对奇异夸克质量的依赖关系,并对p^6阶的某些相关耦合c_i提供了类似的关系。这个谈话评论所使用的方法,并说明所获得的结果的影响。

英文摘要:

Chiral perturbation theory in the two--flavour sector allows one to analyse Green functions in QCD in the limit where the strange quark mass is considered to be large in comparison to the external momenta and to the light quark masses m_u and m_d. In this framework, the low--energy constants of SU{2}_R \times SU{2}_L depend on the value of the heavy quark masses. For the coupling constants which occur at order p^2 and p^4 in the chiral expansion, we worked out the dependence on the strange quark mass at two--loop accuracy, and provided analogous relations for some of the couplings c_i which are relevant at order p^6. This talk comments on the methods used, and illustrates implications of the results obtained.

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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