1203.3389 (Deshan Yang et al.)

χ_{QJ} -> l^+l^- within and beyond the Standard Model    [PDF]

Deshan Yang, Shuai Zhao

We revisit chi_{QJ}->l^+l^- (with J=0,1,2 and Q=b,c) within the Standard Model (SM). The electro-magnetic contributions are given in color-singlet model with non-vanishing lepton masses at the leading order of $v$. Numerically, the branching ratios of chi_{QJ} -> l^+l^- predicted within the SM are so small that such decays are barely possible to be detected at future BESIII and SuperB experiments. We investigate chi_{b0}->l^+l^- in Type-II 2HDM with large tan beta, and chi_{b2}->l^+l^- in the Randall-Sundrum model, to see their chance to be observed in future experiments.

View original: http://arxiv.org/abs/1203.3389