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arXiv 1012.4868hep-ph
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三种口味都很特别吗?

Are three flavors special?

Amir H. Fariborz, Renata Jora, Joseph Schechter, M. Naeem Shahid

摘要:

最近人们越来越清楚地认识到,描述低自旋介子多重态的三个味九重态的规则模式对于自旋为0的标量介子似乎需要作一些修改。一个图片已经取得了一定的成功,对待标量的手征拉格朗日框架,并认为他们填充两个九。这些又被认为是由两个“裸”的九重态混合而成的,其中一个是夸克-反夸克型,另一个是两个夸克-两个反夸克型。在这里,我们表明,这样的混合是,之前的手征对称性打破条款包括在内,只有可能的三种口味。在其他情况下,这两类结构不能具有相同的手征对称性变换性质。具体地说,我们的标准将导致人们相信,标量和赝标态包含魅力不会有“四夸克”的混合物。这项工作是潜在的兴趣,构建手征拉格朗日的基础上,然后打破了众所周知的特定条款的确切手征对称性。它也可能对研究某些类型的彩色理论感兴趣。

英文摘要:

It has become clearer recently that the regular pattern of three flavor nonets describing the low spin meson multiplets seems to require some modification for the case of the spin 0 scalar mesons. One picture which has had some success, treats the scalars in a chiral Lagrangian framework and considers them to populate two nonets. These are, in turn, taken to result from the mixing of two "bare" nonets, one of which is of quark- antiquark type and the other of two quark- two antiquark type. Here we show that such a mixing is, before chiral symmetry breaking terms are included, only possible for three flavors. In other cases, the two types of structure can not have the same chiral symmetry transformation property. Specifically, our criterion would lead one to believe that scalar and pseudoscalar states containing charm would not have "four quark" admixtures. This work is of potential interest for constructing chiral Lagrangians based on exact chiral symmetry which is then broken by well known specific terms. It may also be of interest in studying some kinds of technicolor theories.

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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