Reflection symmetries and universal four-zero texture.
Reflection symmetries and universal four-zero texture.
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发表时间:
2020-03
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通讯作者:
M. J. Yang
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作者:
M. J. Yang
In this paper, we consider a set of new exact symmetry in the SM, {\it reflection} symmetries $R m_{u,\nu}^{*} R = m_{u,\nu}, ~ m_{d,e}^{*} = m_{d,e}$ with $R =$ diag $(-1,1,1)$. These symmetries are remnants of $\mu-\tau$ reflection symmetries after deduction of $\mu-\tau$ symmetry. These extended $C$ symmetries can predict the zero QCD $\theta$-term $\theta_{\rm QFD}=0$ at tree level with proper $CP$ phases $\delta_{CP}$ of the CKM and MNS matrices. Moreover, they can constrain the Majorana phases to be $\alpha_{2,3} /2 = 0$ or $\pi /2$ and then enhance predictivity of the leptogenesis.