Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-09-19
Eur.Phys.J.C46:403-405,2006
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 1 figure, LaTeX2e
Scientific paper
10.1140/epjc/s2006-02507-9
We find some constraints on the flavor changing vertices of the two Higgs doublet model, from the \Delta M_{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 \xi_{bb}, \xi_{tc} and \xi_{sb}. Using the Cheng-Sher parametrization, we found that for a relatively light charged Higgs boson (200-300 GeV), we get that \lambda _{tt}<1, while the parameter \lambda_{bb} could have values up to about 50. In addition, we use bounds for \lambda_{tt} and \lambda_{bb} obtained from B^{0}->X_{s}\gamma at 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 \Delta M_{B_{d}} is not sensitive to the change of the parameter \lambda_{sb}, while \lambda_{tc}<1
Diaz Rodolfo A.
Martinez Rafael
Sandoval Carlos E.
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