1209.1694 (Yoshio Koide)
Yoshio Koide
From the observed deviations from the $e$-$\mu$-$\tau$ universality, an existence of family gauge bosons with a visible energy scale is speculated. The data suggest that family gauge bosons have an inverted mass hierarchy and the lightest gauge boson mass is $M_{33} \sim 1$ TeV, although the data, at present, have too large errors to obtain a conclusive result. Consistency of such a speculation with other phenomenon is discussed.
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http://arxiv.org/abs/1209.1694
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