Bₛ → PP decays and the NLO contributions in the pQCD Approach

الأصل · EN

By employing the perturbative QCD(pQCD) factorization approach, we calculated the partial next-to-leading order (NLO) contributions to Bₛ → P P decays (P= π, K,), coming from the QCD vertex corrections, the quark-loops and the chromo-magnetic penguins. we found numerically that (a) for three measured decays Bₛ → K+ π-, K+K- and π+π-, the consistency between the pQCD predictions and the measured values are improved effectively by the inclusion of the NLO contributions; (b) for Bₛ → K⁰ and K⁰π⁰ decays, the NLO enhancements to the branching ratios can be significant, from 50% to 170%, to be tested by the LHC experiments; (c) for the CP-violating asymmetries, the leading order pQCD predictions can also be changed significantly by the inclusion of the NLO contributions; (d) for Bₛ → K+π- decay, the pQCD prediction for the direct CP asymmetry is (Bₛ → K+π-)=0.26± 0.06, which agrees very well with the only measured value available currently.