Title: Constraints on New Physics from decays of polarized $Λ_b^0$ baryons at the FCC-ee Show Chinese title

Title: 极化$Λ_b^0$重子在FCC-ee中的衰变对新物理的约束

Abstract: The $Z^0$ bosons produced in electron-positron collisions at the potential Future Circular Collider (FCC-ee) provide unique opportunities for flavour physics. The non-zero polarization of \Lb baryons produced in $Z^0$ decays enables access to a much larger set of observables than at the LHC, where the \Lb baryons are produced unpolarized. This paper presents a toy angular analysis of $\Lambda_b^0\to \Lambda(\to p\pi^-)\mu^+\mu^-$ decays using simulation samples of collisions at the FCC-ee reconstructed using the IDEA detector concept and assuming a dataset of $6\times 10^{12}$ $Z^0$ bosons. While the statistical sensitivity achieved for individual angular observables is not expected to significantly exceed that from the LHCb Upgrade II experiment, the addition of the polarized observables leads to a significant improvement of the knowledge on the Wilson coefficients $C_9$ and $C_{10}$. Show Chinese abstract

Abstract: 在潜在的未来环形对撞机（FCC-ee）中，电子-正电子碰撞产生的$Z^0$粒子为味物理提供了独特的机会。在$Z^0$衰变中产生的\Lb 重子的非零极化使能够访问比大型强子对撞机（LHC）中更大的可观测量集合，因为在LHC中，\Lb 重子是未极化的。本文使用利用IDEA探测器概念重建的FCC-ee碰撞模拟样本，假设数据集包含$6\times 10^{12}$ $Z^0$ 粒子，对$\Lambda_b^0\to \Lambda(\to p\pi^-)\mu^+\mu^-$衰变进行了一个玩具角度分析。 尽管针对单个角度可观测量获得的统计灵敏度预计不会显著超过LHCb升级II实验的结果，但加入极化可观测量将显著提高对威尔逊系数$C_9$和$C_{10}$的了解。