论文标题
B-Baryon衰减中CP违规的新提取
New extraction of CP violation in b-baryon decays
论文作者
论文摘要
我们在B-Baryon衰减中研究CP违规的$ξ_b^ - \ toξ^ - d $，$ d = d^0，\ bar {d}^0 $和$ d_i〜（i = 1,2）$。我们发现，由于缺乏相对强期，这些重型衰减过程为测量弱相提供了理想的机会。明确地说，我们将$ \barρ$和$ \barη$与$ r_i =γ（ξ_b^ - \ to配给ξ^-d_ {i}） /γ（ξ_b^ - \ to en end_b^ - fo cond_-d_b^ - toξ^-d-d^-d^0）$的CKM元素的衰减比率为$ r_i =γ（ξ_b^ - \ toξ^-d_ {i}）$。作为补充，我们还检查了$λ_b\ \toλ（\ topπ^ - ）d $的衰减分布。总共有32个衰减可观察结果，可以通过9个真实参数进行参数化，从而允许实验提取角度$γ\ equiv \ equiv \ earg（-v_ {ud} v_ {ub}^*/v_/v_ {cd} v_ {cd} v_ {cb}^*）另外，讨论了实验测量的可行性。我们发现，可以从$ξ_b^ - \ toξ^ - d $在LHCB Run3上提取$ \barρ$和$ \barη$，以及$λ_b\toλ（\ topπ^ - ）d $的完整分析在LHCB Run4上可用。
We study CP violation in b-baryon decays of $Ξ_b^- \to Ξ^- D$ with $D = D^0, \bar{D}^0$ and $D_i~(i=1,2)$. We find that these baryonic decay processes provide an ideal opportunity to measure the weak phase due to the absence of the relative strong phase. Explicitly, we relate $\barρ$ and $\barη$ the CKM elements with the decay rate ratios of $R_i= Γ(Ξ_b^- \to Ξ^-D_{i} ) / Γ( Ξ_b^- \to Ξ^-D^0 )$ without the charge conjugate states. As a complementary, we also examine the decay distributions of $Λ_b \to Λ(\to p π^- ) D$. There are in total 32 decay observables, which can be parameterized by 9 real parameters, allowing the experiments to extract the angle $γ\equiv \arg(-V_{ud}V_{ub}^*/V_{cd}V_{cb}^*)$ in the CKM unitarity triangle. In addition, the feasibilities of the experimental measurements are discussed. We find that $\barρ$ and $\barη$ can be extracted at LHCb Run3 from $Ξ_b^- \to Ξ^- D$, and a full analysis of $Λ_b \to Λ(\to p π^-)D$ is available at LHCb Run4.
