论文标题
双身弱衰变的双重迷人的bary子
Two-body weak decays of doubly charmed baryons
论文作者
论文摘要
在这项工作中研究了双重迷人的Baryons $ξ_{cc}^{++} {cc}^{cc}^+$和$ω__{cc}^+$的HADRONIC两体弱衰减。为了估算不可侵略的贡献，我们以$ p $ - 波振幅的杆模型和目前的代数为$ s $ wave。对于$ξ_{cc}^{++} \ toξ_c^+π^+$模式，我们在$ s $和$ p $ -P $ -Wave Ampliudes的可置换和不可分解的贡献之间找到了巨大的破坏性干扰。我们对其分支分数的$ \ sim 0.70 \％$的预测小于不考虑不可效应效果的早期估计，但基于完全不同的方法，即协变量的Quark模型，与结果非常吻合。相反，在Dhir和Sharma的$ P $波振幅中发现了大型建设性干扰，导致订单$（7-16）\％$的分支部分。使用$（λ_c^+，ξ_c^+）\的绝对分支分数的当前结果，到p k^-π^+$以及$ξ_{cc}^{++} {++} \ tope了π^+π^+$，我们获得$ \ b（ξ_{cc}^{++} \toξ_c^+π^+）_ {\ rm expt} \ of（1.83 \ pm1.01） $ \ b（ξ_{cc}^{++} \toς_c^{++} \ overline {k}^{*0}）$。我们对$ \ Mathcal {b}（ξ_{cc}^{++} \toξ_c^+π^+）\ of 0.7 \％$的预测与实验值一致，但在下端。在未来的研究中固定该模式的分支部分很重要。可取分且非脱位$ s $ - 波振幅在$ξ_{cc}^+\ to了ξ_c^0π^+$中建设性地干涉。它的大量分支4 \％可以使实验者能够通过此模式搜索$ξ_{cc}^+$。也就是说，$ξ_{cc}^+$是通过$ξ_{cc}^+\ to了ξ_c^0π^+$重建的，其次是衰减链$ξ_c^0 \ toξ^-π^+\ topπ^-π^-π^-π^-π^-π^-π^+$。
The hadronic two-body weak decays of the doubly charmed baryons $Ξ_{cc}^{++}, Ξ_{cc}^+$ and $Ω_{cc}^+$ are studied in this work. To estimate the nonfactorizable contributions, we work in the pole model for the $P$-wave amplitudes and current algebra for $S$-wave ones. For the $Ξ_{cc}^{++}\to Ξ_c^+π^+$ mode, we find a large destructive interference between factorizable and nonfactorizable contributions for both $S$- and $P$-wave amplitudes. Our prediction of $\sim 0.70\%$ for its branching fraction is smaller than the earlier estimates in which nonfactorizable effects were not considered, but agrees nicely with the result based on an entirely different approach, namely, the covariant confined quark model. On the contrary, a large constructive interference was found in the $P$-wave amplitude by Dhir and Sharma, leading to a branching fraction of order $(7-16)\%$. Using the current results for the absolute branching fractions of $(Λ_c^+,Ξ_c^+)\to p K^-π^+$ and the LHCb measurement of $Ξ_{cc}^{++}\toΞ_c^+π^+$ relative to $Ξ_{cc}^{++}\toΛ_c^+ K^- π^+π^+$, we obtain $\B(Ξ_{cc}^{++}\toΞ_c^+π^+)_{\rm expt}\approx (1.83\pm1.01)\%$ after employing the latest prediction of $\B(Ξ_{cc}^{++}\toΣ_c^{++}\overline{K}^{*0})$. Our prediction of $\mathcal{B}(Ξ_{cc}^{++}\toΞ_c^+π^+)\approx 0.7\%$ is thus consistent with the experimental value but in the lower end. It is important to pin down the branching fraction of this mode in future study. Factorizable and nonfactorizable $S$-wave amplitudes interfere constructively in $Ξ_{cc}^+\toΞ_c^0π^+$. Its large branching fraction of order 4\% may enable experimentalists to search for the $Ξ_{cc}^+$ through this mode. That is, the $Ξ_{cc}^+$ is reconstructed through the $Ξ_{cc}^+\toΞ_c^0π^+$ followed by the decay chain $Ξ_c^0\to Ξ^-π^+\to pπ^-π^-π^+$.
