Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-27
Commun.Theor.Phys.47:1099-1105,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
11 pages, 2 EPS figures, RevTex, new references added
Scientific paper
10.1088/0253-6102/47/6/026
We calculate the new physics contributions to the neutral $B_d^0$ and $B_s^0$ meson mass splitting $\Delta M_d$ and $\Delta M_s$ induced by the box diagrams involving the charged-Higgs bosons in the top quark two-Higgs doublet model (T2HDM). Using the precision data, we obtain the bounds on the parameter space of the T2HDM: (a) for fixed $M_H=400$ GeV and $\delta=[0^\circ,60^\circ]$, the upper bound on $\tan{\beta}$ is $\tan \beta \leq 30$ after the inclusion of major theoretical uncertainties; (b) for the case of $\tan{\beta} \leq 20$, a light charged Higgs boson with a mass around 300 GeV is allowed; and (c) the bounds on $\tan{\beta}$ and $M_H$ are strongly correlated: a smaller (larger) $\tan{\beta}$ means a lighter (heavier) charged Higgs boson.
Lü Lin-Xia
Xiao Zhen-Jun
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