Perturbative QCD estimation of the Bc exclusive nonleptonic decays

Department of Physics, Henan Normal University, Xinxiang, Henan, 453002, China
Physics Letters B (Impact Factor: 6.13). 10/1996; 387(1):187-190. DOI: 10.1016/0370-2693(96)00992-6


We argue that the Bc exclusive nonleptonic decays are perturbatively calculable. Working in a perturbative QCD model of Brodsky et al., we pay attention to the estimate of the partial widths of the modes , , etc., which serve to identify Bc mesons and determine the Bc mass and life time. Our estimations are found to be lower than the other predictions. We note that the spectator ansatz might be misleading in dealing with Bc weak decays. So the results will be potentially important at LHC to measure the Bc meson and to test various models of weak decays of heavy mesons.

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    ABSTRACT: The hypothesis is scrutinized that the weak interaction of hadronic systems at low energies is dominated by the coupling of the pseudoscalar, vector, and axial-vector mesons to the weak gauge bosons. The strength of the weak coupling of the rho(770) meson is uniquely determined by vector-meson dominance in electromagnetic interactions; flavor and chiral symmetry breaking effects modify the coupling of other vector mesons and axial-vector mesons. Many decay rates are calculated and compared to experimental data and partly to predictions of other models. A parameter-free description of the decay K^+ --> pi^+ e^+e^- is obtained. Predictions for several not yet observed decay rates and reaction cross sections are presented. The relation between the conserved vector current hypothesis and meson dominance is clarified. Phenomenological success of the meson dominance suggests that in some calculations based on the standard model the weak quark-antiquark annihilation and creation diagrams may be more important than anticipated so far. The processes are identified where the meson dominance fails, implying that they are governed, on the quark level, by some other standard model diagrams. Comment: RevTeX, 57 pages, 19 embedded PostScript figures, epsf.sty, to be published in Phys. Rev. D
    Preview · Article · Feb 1997 · Physical Review D
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    ABSTRACT: We make predictions for the exclusive semileptonic and nonleptonic decay widths of the Bc meson. We evaluate the Bc semileptonic form factors for different decay channels in a relativistic model, and use factorization to obtain the nonleptonic decay widths.
    Full-text · Article · Jun 2000 · Physical review D: Particles and fields
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    ABSTRACT: Using the leading-order low-energy effective Hamiltonian, we calculate [iopmath latex="$B_c\rightarrow PP$"] BcPP [/iopmath] (where P stands for pseudoscalar meson) decays induced by pure W-emission mechanisms. In order to estimate the hadronic matrix elements, we apply the perturbative quantum chromodynamics (PQCD) method proposed by Szczepaniak et al. [Phys. Lett. B 243 (1990) 287] and developed by Simma et al. [Phys. Lett. B 272 (1991) 395]. Compared with the predictions of other models, we find that the PQCD method is suitable for these decays and therefore the spectator ansatz seems questionable.
    No preview · Article · Jan 2001 · Chinese Physics Letters
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