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Though not completely a surprise according to the standard model and existingindirect constraints, the Higgs-like particle, h, of mass around 125 GeVrecently observed at the LHC may offer an additional window to physics beyondthe standard model. In particular, its decay pattern can be modified by theexistence of new particles. One of the popular scenarios involves a Z' bosonassociated with an extra Abelian gauge group. In this study, we explore thepotential effects of such a boson with family-nonuniversal couplings on theleptonic decays of h, both flavor-conserving and flavor-changing. For currentconstraints, we take into account leptonic decays at the Z pole, LEP IIscattering data, limits on various flavor-changing lepton transitions, andlepton magnetic dipole moments. Adopting a model-independent approach andassuming that the Z' has negligible mixing with the Z boson, we find thatpresent data allow the Z' effects to reach a few percent or higher on h decaysinto a pair of leptons. Future measurements on h at the LHC or a linearcollider can therefore detect the Z' contributions or impose furtherconstraints on its couplings. We also consider Z'-mediated four-lepton decaysof the Z and W bosons.

Effects of Family Nonuniversal Z' Boson on Leptonic Decays of Higgs and Weak Bosons