Charged lepton flavor violating processes and scalar leptoquark decay branching ratios in the colored Zee-Babu model

• DOI: 10.1007/jhep10(2016)106
• Publication Date: 2016-10-20T10:48:10Z
• Authors: We-Fu Chang; Siao-Cing Liou; Chi-Fong Wong; Fanrong Xu
• Keywords: Leptoquark; Yukawa potential; Diquark; Lepton number

We consider a neutrino mass generating model which employs scalar leptoquark, Δ, and diquark, S. The new scalars Δ S carry the standard SU(3) c × SU(2) L U(1) Y quantum numbers (3, 1, −1/3) (6, −2/3), respectively. masses are generated at two-loop level, as in Zee-Babu [1, 2], Δ/S plays role of doubly/singly charged model. With moderate working assumption that magnitudes six Yukawa couplings between down-type quarks same order, strong connections found lepton flavor violating processes. In particular, we study $$ Z\to \overline{l}{l}^{\prime } , l→l ′γ find some portions parameter space this within reach planned experiments. Interesting lower bounds predicted B\left(Z\to \overline{l}{l}^{\prime}\right)\gtrsim 1{0}^{-16} - 1{0}^{-14}\left(1{0}^{-14}\right) \times {\left(1\ \mathrm{T}\mathrm{e}\mathrm{V}\ \cdotp {m}_S/7{m}_{{}^{\Delta}}^2\right)}^2 B(l → l′γ) ≳ 10− 17 − 16(10− 18 16) (1 TeV · m /7m 2 )2 for being normal (inverted) hierarchical pattern. type hierarchy could also be determined by measuring double ratios. Moreover, definite leptoquark decay branching ratios when there is no interaction right-handed fermions (the fraction to quark 50%), help refine collider search limit on mass.