An analysis of decays using a global fit in QCD factorization
Department of Physics, University of Regina, SK, S4S 0A2, Canada
2 Department of Physics, Yonsei University, 120-479, Seoul, Korea
3 Theory Group, KEK, 305-0801, Tsukuba, Ibaraki, Japan
* e-mail: firstname.lastname@example.org
In the framework of QCD factorization, we study decays. In order to more reliably determine the phenomenological parameters X H and X A arising from end-point divergences in the hard spectator scattering and weak annihilation contributions, we use the global analysis for twelve and VP decay modes, such as , , , , et cetera, but excluding the modes whose (dominant) internal quark-level process is . Based on the global analysis, we critically investigate possible magnitudes of X H,A and find that both large and small X H,A terms are allowed by the global fit. In the case of the large X H,A effects, the standard model (SM) prediction of the branching ratios (BRs) for is large and well consistent with the experimental results. In contrast, in the case of the small X H,A effects, the SM prediction for these BRs is smaller than the experimental data. Motivated by the recent Belle measurement of through , if we take into account possible new physics effects on the quark-level process , we can explicitly show that these large BRs can be understood even in the small X H,A case. Specifically, we present two new physics scenarios: R-parity violating SUSY and R-parity conserving SUSY.
© Springer-Verlag, 2004