Light vectors coupled to bosonic currents Article Swipe
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·
· 2019
· Open Access
·
· DOI: https://doi.org/10.1103/physrevd.99.055016
· OA: W2898944269
New spin-1 particles with masses below the weak scale are present in many\ntheories of beyond Standard Model (SM) physics. In this work, we extend\nprevious analyses by systematically considering the couplings of such a vector\nto the bosonic sector of the SM, focusing on models that lead to mass-mixing\nwith the Z boson. These couplings generically lead to enhanced emission of the\nvector's longitudinal mode, both in Higgs decays and in flavor changing meson\ndecays. We present bounds in the SM+X effective theory and investigate their\nmodel-dependence. For the case of Higgs decays, we point out that tree-level\nvector emission is, depending on the model, not always enhanced, affecting the\nconstraints. For meson decays, which are the dominant constraints at small\nvector masses, we find that while $B$ decay constraints can be weakened by\nfine-tuning UV parameters, it is generically difficult to suppress the\nstringent constraints from kaon decays.\n
