Improving bounds on flavor changing vertices in the two Higgs doublet model from $B-\bar{B}$ mixing

Abstract

We find some constraints on the flavor changing vertices of the two Higgs doublet model, from the ΔM_{B_{d}} measurement. Although bounds from this observable have already been considered, this paper takes into account the role of a new operator not included previously, as well as the vertices ξ_{bb}, ξ_{tc} and ξ_{sb}. Using the Cheng-Sher parametrization, we found that for a relatively light charged Higgs boson (200-300 GeV), we get that λ_{tt}<1, while the parameter λ_{bb} could have values up to about 50. In addition, we use bounds for λ_{tt} and λ_{bb} obtained from B^{0}->X_{s}γat next to leading order, and studied the case where the only vanishing vertex factors are the ones involving quarks from the first family. We obtained that ΔM_{B_{d}} is not sensitive to the change of the parameter λ_{sb}, while λ_{tc}<1

arXiv comment4 pages, 1 figure, LaTeX2e

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• W- and Z-Boson Interactions in Supersymmetric Models with Explicit R-Parity Violation
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Cited by in corpus (6)

• Theory and phenomenology of two-Higgs-doublet models
• New Physics effects in the flavor-changing neutral couplings of the Top quark
• Search for the lepton-flavour violating decays $B_{(s)}^0\to e^{\pm }{\mu }^{\mp }$
• Anomalous B meson mixing and baryogenesis in a two Higgs doublet model with top-charm flavor violation
• Minimal flavour violations and tree level FCNC
• The LFV decays $B_{d,s}^0\to e\mu (e\tau ,\mu \tau )$ with one neutral singlet scalar