FCNC portals to the dark sector

Details FCNC portals to the dark sector FCNC portals to the dark sector

2011-11-28

arxiv.org/abs/1111.6402v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

55 pages. Minor corrections & references added. To appear in JHEP

Scientific paper

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 the K and B mesons with missing energy in the final state. The most sensitive decay modes in the s to d, b to d, and b to s sectors are identified and compared for each type of couplings to the new invisible state.

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