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arXiv 1102.2400hep-ph
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标准模型中首阶单圈CP和P破坏有效action

Leading order one-loop CP and P violating effective action in the Standard Model

L. L. Salcedo

摘要:

对标准模型中的费米子进行积分,得到了零温下P和CP破坏扇区中的有效拉格朗日量。我们确认,没有贡献出现的运营商的尺寸为6或更小,并显示,领先的运营商是8维。为了证明这一点,我们明确计算了一个这样的非零贡献,即有三个Z^0、两个W^+和两个W^-的贡献。只涉及胶子和W的条款也被认为是,但是,他们原来消失在P-奇数部门的八阶。在CP-奇和P-偶(C-奇)扇区中的类似胶子项是非零的,并且它也被计算。导出的表达式直接适用于狄拉克大质量中微子。所有违反CP的结果都显示了在六维空间已经发现的红外增强。

英文摘要:

The fermions of the Standard Model are integrated out to obtain the effective Lagrangian in the sector violating P and CP at zero temperature. We confirm that no contributions arise for operators of dimension six or less and show that the leading operators are of dimension eight. To assert this we explicitly compute one such non-vanishing contribution, namely, that with three Z^0, two W^+ and two W^-. Terms involving just gluons and W's are also considered, however, they turn out to vanish in the P-odd sector to eighth order. The analogous gluonic term in the CP-odd and P-even (C-odd) sector is non-vanishing and it is also computed. The expressions derived apply directly to Dirac massive neutrinos. All CP-violating results display the infrared enhancement already found at dimension six.

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