Leading logarithmic QCD corrections to the Bs → γγ decay rate including long-distance effects through Bs → φγ → γγ
نویسندگان
چکیده
منابع مشابه
Complete three - loop QCD corrections to the decay H → γγ
We present the result for the three-loop singlet QCD corrections to the decay of a Higgs boson into two photons and improve the calculation for the non-singlet case. With the new result presented, the decay width Γ(H → γγ) is completely known at O(GFααs, GFα).
متن کاملNext-to-Leading Order QCD corrections to the Lifetime Difference of Bs Mesons
In this talk we present a calculation of the dacay rate difference in the neutral Bs − Bs system, ∆ΓBs , in next-to-leading order (NLO) QCD. We find a sizeable decrease compared to leading-order (LO) estimates: (∆Γ/Γ)Bs = (fBs/210MeV ) [0.006B(mb)+0.150BS(mb)−0.0063] in terms of the bag parameters B and BS in the NDR scheme. We put special emphasize on the theoretical and physical implications ...
متن کاملNext-to-Leading Order QCD Corrections to the Lifetime Difference of Bs Mesons
We compute the QCD corrections to the decay rate difference in the Bs–B̄s system, ∆ΓBs , in the next-to-leading logarithmic approximation using the heavy quark expansion approach. Going beyond leading order in QCD is essential to obtain a proper matching of the Wilson coefficients to the matrix elements of local operators from lattice gauge theory. The lifetime difference is reduced considerably...
متن کاملQCD Corrections to b → sγγ and Exclusive B s → γγ decay
The short distance QCD corrections to b → sγγ are calculated in the leading logarithmic approximation. The equivalence of operator basis reduction for S-matrix elements by using the equations of motion or by proving a low energy theorem is discussed. We apply the above results to the exclusive Bs → γγ decay. The branching ratio of this decay is found to be 5 × 10 in the Standard Model. We also ...
متن کامل/ 97 06 25 3 v 1 5 J un 1 99 7 QCD corrections to b → sγγ induced decays : B → X s γγ and B s → γγ
We present a complete calculation of the Leading Order QCD corrections to the quark level decay amplitude for b → sγγ and study their relevance for both the inclusive branching ratio BR(B → Xsγγ) and for the exclusive decay channel Bs → γγ. In addition to the uncertainties in the short distance calculation, due to the choice of the renormalization scale, an appreciable uncertainty in both Bs → ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 1997
ISSN: 0370-2693
DOI: 10.1016/s0370-2693(97)00861-7