ar X iv : h ep - p h / 97 12 44 5 v 1 1 8 D ec 1 99 7 OITS - 644 COLO
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چکیده
We consider two body decays of B meson into a light vector (V) and a pseudoscalar (P) meson. The constraint obtained from the B → P P modes on the parameter space of the input parameters is imposed also on B → V P modes. In particular we constrain ξ ≡ (1/N c) for those modes from recently measured B → ωK, φK and are able to get a satisfactory pictures for all modes where data exists. Modes that should be seen shortly and those with possibly large CP asymmetries are identified. 1 Recently CLEO [1,2] has reported information on the branching ratios of a number of exclusive modes where B decays into a pair of pseudoscalars (P) or a vector (V) and a pseudoscalar meson. In some cases they have seen the decay for the first time and in other cases they have improved the bounds. Among the B to P P modes it was found that the branching ratio of the mode B → η ′ K is larger than expected. We have shown that [3] by a suitable choice of parameters, this large branching ratio can be explained in the context of factorization technique without invoking any new physics or high charm content in η ′. The same parameter space is also found to account for other B → P P modes (e.g. B → πK and B → ππ) consistent with the experimental data. The parameters involved in the above process are 1) effective number of color ξ(≡ 1/N c), 2) CKM angles and phases 3) Form factors 4) the QCD scale and 5) the light quark masses. In this paper we calculate all B → V P modes using the same parameter space as was used in the case of B → P P modes, with the exception of ξ. This is because ξ which takes account of non-factorizable contributions could in principle be different in V P final states. We also need one new form factor which appears in the matrix element of the states involving B meson and a vector meson. We use the experimental bound on B → ωK and B → φK to put restriction on ξ and the new form factor. We then predict the branching ratios and the CP asymmetries for all the other modes, some of which are expected to be measured soon. The calculations proceed in two …
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تاریخ انتشار 1997