Branching ratios and CP asymmetries of $B \to K η^{(\prime)}$ decays in the pQCD approach

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dc.creatorXiao, Zhen-Jun
dc.creatorZhang, Zhi-Qing
dc.creatorLiu, Xin
dc.creatorGuo, Li-Bo
dc.date2008-07-26
dc.date2008-09-25
dc.date.accessioned2026-07-07T12:15:07Z
dc.date.available2026-07-07T12:15:07Z
dc.descriptionWe calculate the branching ratios and CP violating asymmetries of the four $B \to K \etap$ decays in the perturbative QCD (pQCD) factorization approach. Besides the full leading order contributions, the partial next-to-leading order (NLO) contributions from the QCD vertex corrections, the quark loops, and the chromo-magnetic penguins are also taken into account. The NLO pQCD predictions for the CP-averaged branching ratios are $Br(B^+ \to K^+ η) \approx 3.2 \times 10^{-6}$, $Br(B^\pm \to K^\pm \etar) \approx 51.0 \times 10^{-6}$, $Br(B^0 \to K^0 η) \approx 2.1 \times 10^{-6}$, and $Br(B^0 \to K^0 \etar) \approx 50.3 \times 10^{-6}$. The NLO contributions can provide a 70% enhancement to the LO $Br(B \to K \etar)$, but a 30% reduction to the LO $Br(B \to K η)$, which play the key role in understanding the observed pattern of branching ratios. The NLO pQCD predictions for the CP-violating asymmetries, such as $\acp^{dir} (K^0_S \etar) \sim 2.3% $ and $\acp^{mix}(K^0_S \etar)\sim 63%$, agree very well with currently available data. This means that the deviation $ΔS=\acp^{mix}(K^0_S \etar) - \sin{2β}$ in pQCD approach is also very small.
dc.description31 pages, 11 ps/eps figures, typos corrected. A little modification
dc.identifierhttps://arxiv.org/abs/0807.4265
dc.identifierhttp://arxiv.org/abs/0807.4265
dc.identifierPhys.Rev.D78:114001,2008
dc.identifierdoi:10.1103/PhysRevD.78.114001
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/211414
dc.subjectHigh Energy Physics - Phenomenology
dc.titleBranching ratios and CP asymmetries of $B \to K η^{(\prime)}$ decays in the pQCD approach
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