Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-05-28
JHEP 1010:009,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 4 figures. v3: minor modifications (typos corrected and few refs. added), conclusions unchanged; journal version
Scientific paper
10.1007/JHEP10(2010)009
We compare the effectiveness of two hypotheses, Natural Flavour Conservation (NFC) and Minimal Flavour Violation (MFV), in suppressing the strength of flavour-changing neutral-currents (FCNCs) in models with more than one Higgs doublet. We show that the MFV hypothesis, in its general formulation, is more stable in suppressing FCNCs than the hypothesis of NFC alone when quantum corrections are taken into account. The phenomenological implications of the two scenarios are discussed analysing meson-antimeson mixing observables and the rare decays B -> mu+ mu-. We demonstrate that, introducing flavour-blind CP phases, two-Higgs doublet models respecting the MFV hypothesis can accommodate a large CP-violating phase in Bs mixing, as hinted by CDF and D0 data and, without extra free parameters, soften significantly in a correlated manner the observed anomaly in the relation between epsilon_K and S_psi_K.
Buras Andrzej J.
Carlucci Maria Valentina
Gori Stefania
Isidori Gino
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