Theory of Rare B Meson Decays
نویسنده
چکیده
I review the NLO QCD calculations of the branching ratio for B → Xsγ in the SM. Including the leading electromagnetic corrections, one obtaines BR(B → Xsγ) = (3.32±0.30)×10−4. Confronting theory with the newest data, an updated value for |Vts| is obtained: |Vts| = 0.037±0.007. Theoretical progress on the photon energy spectrum is also discussed. The inclusive FCNC semileptonic decays in the SM are briefly summarized. Furthermore, B → Xsγ is considered in 2HDMs and in different SUSY scenarios. QCD corrections are shown to be crucial.
منابع مشابه
Combination of Colour Favoured and Colour
In this research we described the effective Hamiltonian theory and applied this theory to the calculation of current-current (Q1,2) and QCD penguin (Q3,…,6) c quark decay rates. We calculated the decay rates of semileptonic and hadronic of charm quark in the effective Hamiltonian theory. We investigated the decay rates of D meson decays according to Spectator Quark Model (SQM) for the calculati...
متن کاملRare Decays in BaBar: Search for Decays of the Neutral B Meson into Two Leptons and Measurement of CP Asymmetry in Inclusive Radiative Decays of the B Meson into a Strange-quark System
RARE DECAYS IN BABAR: SEARCH FOR B → `+`′− DECAYS AND MEASUREMENT OF CP ASYMMETRY IN INCLUSIVE B → Xsγ DECAYS.
متن کاملRare Radiative B Decays in Perturbative Qcd
We report on recent progress on perturbative QCD calculations of certain exclusive rare weak B meson decays involving hard photons. In the limit of a photon energy Eγ much larger than ΛQCD , the amplitudes for such processes can be analyzed in a twist expansion in powers of Λ/Eγ . The leading twist amplitude is given by the convolution of a hard scattering amplitude with the B meson light-cone ...
متن کاملar X iv : h ep - e x / 03 12 04 1 v 1 1 2 D ec 2 00 3 RADIATIVE AND ELECTROWEAK RARE B DECAYS
This report summarizes the latest experimental results on radiative and electroweak rare B meson decays. These rare decay processes proceed through the Flavor-Changing-Neutral-Current processes, and thus are sensitive to the postulated new particles in the theories beyond the Standard Model. Experiments at e + e − colliders, Belle, BaBar and CLEO, have been playing the dominant role, while the ...
متن کاملB?J/?(?,K) Decays within QCD Factorization Approach
We used QCD factorization for the hadronic matrix elements to show that the existing data, in particular the branching ratios BR ( ?J/?K) and BR ( ?J/??), can be accounted for this approach. We analyzed the decay within the framework of QCD factorization. We have complete calculation of the relevant hard-scattering kernels for twist-2 and twist-3. We calculated this decays in a special scale ...
متن کامل, B – B̄ mixing , radiative penguin and rare ( semi ) leptonic decays
CKM03 WG2 Conveners' Report: V td and V ts , B– ¯ B mixing, radiative penguin and rare (semi)leptonic decays We introduce the Working Group 2 proceedings contributions from the 2nd workshop on the CKM Unitarity Triangle and note their connection to the proceedings of the first workshop. The topic of WG 2 was the determination of the CKM matrix elements V td and V ts from B-¯ B mixing, radiative...
متن کامل