The Bs width difference beyond the Standard Model
نویسندگان
چکیده
منابع مشابه
The B s width difference beyond the Standard Model Yuval
The Standard Model predicts a large width difference in the Bs system. New physics can contribute significantly to the mass difference. If this contribution is CP violating, this will always result in a reduction of the width difference. The analyses of measurements of the width difference using Bs decays into CP eigenstates have to be modified in the presence of new physics. We discuss how the...
متن کاملThe width difference of Bs mesons
Next-to-leading order QCD corrections to the width difference ∆Γ in the B s-meson system are presented. I further discuss how ∆Γ can be used to detect new physics. b s s b u,c,t u,c,t W W b s s b W W u c t u c t Figure 1: Lowest order contribution to B s −B s mixing in the Standard Model.
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We use the heavy quark expansion to investigate the width difference ∆Γ Bs between the B s mass eigenstates. The corrections of O(Λ QCD /m b) and O(m s /m b) to the leading order expression in the operator product expansion are derived and estimated to yield a sizable reduction of the leading result for ∆Γ Bs by typically 30%. For completeness we also quantify small effects due to penguin opera...
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We extend our previous studies to calculate the B meson B parameters BB and BS on the lattice, and present an update of the results for the Bs meson width difference. We perform an extensive study of systematic errors in the quenched calculation of the B-parameters, and find that the systematic errors are in good control using the NRQCD action for heavy quark. We also report our preliminary res...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1996
ISSN: 0370-2693
DOI: 10.1016/0370-2693(96)00482-0