نتایج جستجو برای: b meson
تعداد نتایج: 908529 فیلتر نتایج به سال:
We present high-statistics results for neutral B-meson mixing and heavy-light-meson leptonic decays in the quenched approximation from tadpole-improved clover actions at β = 6.0 and β = 6.2. We consider quantities such as BBd(s) , fDd(s) , fBd(s) and the full ∆B = 2 matrix elements as well as the corresponding SU(3)-breaking ratios. These quantities are important for determining the CKM matrix ...
In this talk I review recent progress made in extracting | Vub |, within a systematic expansion, from the cut electron energy and hadronic mass spectra of inclusive B meson decays utilizing the data from radiative decays. It is shown that an extraction is possible without modeling the B meson structure function. I discuss the issues involving the assumptions of local duality in various extracti...
We show that in the PQCD approach the B → ρ(ω)K decays display not only the dynamical penguin enhancement, the mechanism responsible for the large branching ratios (BRs) of B → φK decays, but also the importance of annihilation contributions. We find that the CP asymmetries (CPAs) of B → ρK, B → ρ(ω)K (class I) are all over 50%. PACS number(s): 12.38.BX, 12.38.QK, 13.25.HW The study of charmles...
We calculate the semileptonic branching ratio and the charm counting of inclusive B meson decays using the perturbative QCD formalism. For the nonleptonic decays, we employ the modified factorization theorem, in which Wilson coefficients evolve with the characteristic scales of the decay modes. It is found that the decay rate of the single-charm mode b → cūd is enhanced, and a lower BSL is obta...
We perform a global analysis of three-body charmless hadronic decays $B\to VP_3\to P_1P_2P_3$ in the perturbative QCD (PQCD) approach, where $V$ denotes an intermediate vector resonance, and $P_i$, $i=1,2,3$, denote final-state pseudoscalar mesons. Fitting PQCD factorization formulas at leading order strong coupling $\alpha_s$ to measured branching ratios direct $CP$ asymmetries, we determine G...
The lifetimes of B + and B 0 mesons have been measured using a sample of 150,000 hadronic Z 0 decays collected by the SLD experiment at the SLC between 1993 and 1995. The analysis identies the semileptonic decays of B mesons with high (p; p t) leptons and reconstructs the B meson decay length and charge by v ertexing the lepton with a partially reconstructed D meson. This method results in a sa...
Citation Lees, J. et al. " Study of B Xu decays in BB events tagged by a fully reconstructed B-meson decay and determination of |V[subscript ub]|. Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. The MIT Faculty has made this article openly available. Please share how this access be...
In recent years, the existence of a hadronically stable $\overline{b}\overline{b}ud$ tetraquark with quantum numbers $I({J}^{P})=0({1}^{+})$ was confirmed by first principles lattice QCD computations. this work we use to compare two frequently discussed competing structures for considering meson-meson as well diquark-antidiquark creation operators. We static-light approximation, where $\overlin...
Non-relativistic QCD is applied for a lattice computation of the heavy-light meson decay constant in quenched approximation at β = 6.0. Clear signals are obtained for the ground state at large times in the correlators, allowing a reliable extraction of the decay constant. Estimating the current renormalization factor by the tadpole improvement procedure, we find fB = 164(17) MeV for the B meson...
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