FCNC portals to the dark sector

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Abstract
The most general basis of operators parametrizing a low-scale departure from the SM particle content is constructed. The SM gauge invariance is enforced, and operators of lowest dimensions are retained separately for a new light neutral particle of spin 0, 1/2, 1, and 3/2. The basis is further decomposed into couplings to the SM Higgs/gauge fields, to pairs of quark/lepton fields, and to baryon/lepton number violating combinations of fermion fields. This basis is then used to systematically investigate the discovery potential of the rare FCNC decays of theKand B mesons with missing energy in the final state. The most sensitive decay modes in thes → d,b → d, andb → ssectors are identified and compared for each type of couplings to the new invisible state.

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