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Paper   IPM / Particles / 14028
School of Particles and Accelerator
Title:   Direct and Indirect Searches for Top-Higgs FCNC Couplings
Author(s):
 1 . Hoda Hesari 2 . Hamzeh Khanpour 3 . Mojtaba Mohammadi Najafabadi
Status:   Published
Journal: Phys. Rev. D
No.:  113012
Vol.:  92
Year:  2015
Supported by:  IPM
Abstract:
Large top quark flavor changing through neutral currents is expected by many extensions of the standard model. Direct and indirect searches for flavor changing neutral currents (FCNC) in the top quark decays to an up type quark (up,charm) and a Higgs boson are presented. We show that the presence of top-Higgs FCNC couplings affects the neutron electric dipole moment through the contribution to the up quark electric dipole moment significantly. We find that the future bounds on the neutron and top quark electric dipole moments allows to probe the Br(tï¿½??qH) down to 6.62ï¿½?10ï¿½??7. The constraint on the top-Higgs FCNC coupling using the electroweak precision observables of Zï¿½??ccÂ¯ decay is also updated. We further probe the observability of the top-Higgs FCNC couplings through the process eï¿½??e+ï¿½??t(ï¿½??ï¿½??Î½ï¿½??b)tÂ¯(ï¿½??qH), where ï¿½?? = e, Î¼ and q reflects up and charm quarks. It is shown that the branching ratio Br(tï¿½??qH) can be probed down to 1.12ï¿½?10ï¿½??3 at 95