论文标题
子过程$ρ（770,1450）^0 \ to k^+k^ - $贡献$ b^\ pm \ toπ^\ pm k^+k^ - $衰减的大型分支分数吗？
Will the subprocesses $ρ(770,1450)^0\to K^+K^-$ contribute large branching fractions for $B^\pm \to π^\pm K^+K^-$ decays?
论文作者
论文摘要
我们分析了准体衰变$ b^+\toπ^+ρ（770,1450）^0 \toπ^+k^+k^ - $ $在扰动QCD方法中。这项工作中的结果不支持共共鸣$ρ（770,1450）^0 $在$ b^\ pm \toπ^\ pm k^+k^ - $衰减中贡献的大型分支分数。来自共振$ρ（770）^0 $的$ k^+k^ - $的虚拟贡献在实验研究中被忽略了约1.5美元的$ρ（1450）^0 \ k^+k^ - $贡献，预计分支机构$ {\ nathcal $ {\ nathcal b} _v =（1.31 \ pm0.27）\ times10^{ - 7} $和$ {\ Mathcal b} =（8.96 \ pm2.61）\ times10^{ - 8} $，对于$ b^\ pm pm \ tour fister pm \ tour fiste。对于涉及带电的Kaon对的三体Hadronic $ b $衰变的$ρ（770）^0 \ to K^+k^ - $可能会导致在实验分析中的共振$ρ（1450）^0 $的贡献所占的比例。
We analyze the quasi-two-body decays $B^+\toπ^+ρ(770,1450)^0 \toπ^+ K^+K^-$ in the perturbative QCD approach. The results in this work do not support that large branching fractions contributed by the resonances $ρ(770,1450)^0$ in the $B^\pm \to π^\pm K^+K^-$ decays. The virtual contribution for $K^+K^-$ from the tail of the resonance $ρ(770)^0$ which has been ignored in the experimental studies is about $1.5$ times of the $ρ(1450)^0 \to K^+K^-$ contribution, with the predicted branching fractions ${\mathcal B}_v=(1.31\pm0.27)\times10^{-7}$ and ${\mathcal B}=(8.96\pm2.61)\times10^{-8}$, respectively, for these two subprocesses in the $B^\pm \to π^\pm K^+K^-$ decays. The absence of $ρ(770)^0\to K^+K^-$ for the decay amplitude of a three-body hadronic $B$ decay involving charged kaon pair could probably result in a larger proportion for the contribution from the resonance $ρ(1450)^0$ in the experimental analysis.
