arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0907.5422hep-phhep-lat
收藏

矢量介子f_V^T/f_V比的手征修正

Chiral corrections to the f_V^T/f_V ratio for vector mesons

Oscar Cata, Vicent Mateu

摘要:

在这封信中,我们计算了最低位矢量介子多重态(rho,K^*,phi)的张量与矢量衰变耦合之间的比率的主导手征修正。我们发现,领先的手征性的修正来自蝌蚪的贡献,因此是完全固定的手征对称性,而下一个领先的更正是纯粹的分析。有趣的是,手征介子的味结构意味着只有ρ介子对π介子敏感。通过对SU(2)_L \times SU(2)_R \times U(1)_S理论的考察,我们证明了这个结果是容易理解的,并且在m_s展开式中的所有阶都成立。最近的晶格数据似乎符合我们的结果。

英文摘要:

In this letter we compute the leading chiral corrections to the ratio between the tensor and the vector decay couplings for the lowest lying vector meson multiplet (rho, K^*, phi). We show that the leading chiral logarithms arise from tadpole contributions and are therefore entirely fixed by chiral symmetry, while the next to leading corrections are purely analytic. Interestingly, the flavour structure of the chiral logarithms implies that only the rho meson is sensitive to pion logarithms. By examining SU(2)_L\times SU(2)_R\times U(1)_S theories we show that this result can be easily understood and that it holds to all orders in the m_s expansion. Recent lattice data seem to comply with our results.

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。

↑