A Study Of New Physics Effects In B_sâ†'ππ,Ï€K, K K Decays

The standard model is the best theory describing the strong, weak and electromagnetic interactions in particle physics. But there are some problems exist. There are still somewhat differences between the theoretical predictions and the experimental measurements. Since the discovery of b quark, B physics has always been the hot topic of particle physics. It is used to test the standard model exactly, measure the parameters of standard model and discover the new physics. Especially with the more and more attention payed on experiment of B physics in recent years,we believe that this is the best time of the research in B physics. At the same time, the rapid progresses in experiments push forward the advantage in theoretical research.In this paper,starting from the six-quark operator effective Hamiltonian, we systemati-cally study the Bsâ†'ππ,Ï€K, KK decays using the QCD factorization approach both in the Standard Model and two-Higgs-doublet models.From the analytical and numerical results, we find:â‘ The corrections of new physics to Wilson coefficient functions of the Standard Model, mainly reflected in c8g,the corrections to Ci(i=1,...,10) is very small.â‘¡For color-allowed tree-dominated decay mode, Bsâ†'Ï€+K-, the branching ratio is large,but the contribution of QCD penguin-dominated is tiny.Thus the new physics contribution is small.â‘¢For color-suppressed tree-dominated decay mode,Bsâ†'Ï€0K0,the branching ratio is tiny,but the contribution of QCD penguin-dominated is large.Thus the new physics effects can not be ignored.â‘£For QCD penguin-dominated decay modes,Bs Bsâ†'K+K-K0K0,the influence of the new physics is significant. ⑤For pure annihilation modes,Bsâ†'Ï€+Ï€-Ï€0Ï€0, the amplitude contains the QCD anni-hilation diagram,so the contribution of new physics effects is large.â‘¥The branching ratios depend on the parameter MH+, with the increase of MH+, the branching ratios tend to be less and become closer to the predictions of the Standard Model.⑦There are less effects on the direct CP-violation from new physics.