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

2008/12/12 by Liu, Jing, Zhou, Rui, Xiao, Zhen-Jun
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.0812.2312

Abstract

By employing the perturbative QCD(pQCD) factorization approach, we calculated the partial next-to-leading order (NLO) contributions to B_s → P P decays (P= π, K, \etap ), coming from the QCD vertex corrections, the quark-loops and the chromo-magnetic penguins. we found numerically that (a) for three measured decays B_s → 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 B_s → K⁰\etap 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 B_s → K⁺π^- decay, the pQCD prediction for the direct CP asymmetry is \acp^dir(B_s → K⁺π^-)=0.26± 0.06, which agrees very well with the only measured value available currently.

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