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FCNC portals to the dark sector

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 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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Contributor : Dominique Girod <>
Submitted on : Friday, May 11, 2012 - 3:53:45 PM
Last modification on : Thursday, June 17, 2021 - 3:19:02 PM

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J.F. Kamenik, C. Smith. FCNC portals to the dark sector. Journal of High Energy Physics, Springer, 2012, 03(2012), pp.090. ⟨10.1007/JHEP03(2012)090⟩. ⟨in2p3-00696404⟩



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