Photon energy spectrum in B $\to$ $X_S$ + $\gamma$ and comparison with data
| Autor: | Ali, Ahmed, Greub, C. |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 1995 |
| Předmět: |
perturbation theory [quantum chromodynamics]
strangeness [final state] interpretation of experiments: CLEO effective Hamiltonian final state [strangeness] mass: spectator B: radiative decay (photon): energy spectrum wave function [B] CLEO [interpretation of experiments] momentum [quark] decay [inclusive reaction] nonperturbative [model] bottom branching ratio [B] radiative decay: B energy spectrum: (photon) inclusive reaction [decay] ddc:530 B [radiative decay] B: wave function B: branching ratio quantum chromodynamics: perturbation theory spectator: mass numerical calculations radiative decay [B] energy spectrum [(photon)] mass [spectator] CKM matrix matrix quark: momentum spectator [mass] decay: inclusive reaction inclusive reaction: decay strangeness: final state model: nonperturbative (photon) [energy spectrum] final state: strangeness |
| DOI: | 10.3204/pubdb-2022-07330 |
| Popis: | 16 pp. (1995). A comparison of the inclusive photon energy spectrum in the radiative decay B → XS + γ, measured recently by the CLEO Collaboration, with the standard model is presented, using a B-meson wave function model and improving earlier perturbative QCD-based computations of the same. The dependence of the photon energy spectrum on the non-perturbative model parameters, pF, the b-quark Fermi momentum in the B hadron, and mq, the spectator quark mass, is explicitly shown, allowing a comparison of these parameters with the ones obtained from the analysis of the lepton energy spectrum in semileptonic B decays. Taking into account present uncertainties, we estimate BR(B → Xs + γ) = (2.55 ± 1.28) × 10−4 in the standard model, assuming . Comparing this with the CLEO measurement BR(B → Xs + γ) = (2.32±0.67) × 10−4 implies , in agreement with the CKM unitarity. |
| Databáze: | OpenAIRE |
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