arXiv 2107.129932021-07hep-phhep-exhep-lat

重子端点关系

Endpoint Relations for Baryons

Gudrun Hiller, Roman Zwicky

备注：: 21pp + refs, derived tensor form factor constraints and discussion of vicinity of endpoint
DOI：: 10.1007/JHEP11(2021)073

摘要：

在我们早期工作的基础上，我们利用Wigner-Eckart定理建立了重子衰变的运动学端点关系，并将其应用于$\frac{1}{2} \to \frac{1}{2}$和$\frac{1}{2} \to \frac{3}{2}$重子跃迁。我们提供的角度分布在运动学端点，其中持有通用的$d=6$模型无关的有效哈密顿。此外，我们明确验证端点关系，使用一个明确的形状因子参数化和澄清螺旋度为基础的形状因子证据端点关系的约束。我们的研究结果为唯象参数化、理论计算和实验的一致性检验提供了指导。结果适用于LHCb、BES III和Belle II正在进行的和未来的新物理搜索，包括稀有半轻子、双中微子和带电模式，包括$Λ_b \to Λ^{(*)} \ell \ell, Λ_b \to Λ^{(*)} νν$、$Ω_b \to Ω\ell \ell$、$Λ_c \to p \ell \ell$、$Σ\to p \ell \ell$和$Λ_b \to Λ_c^{(*)} \ell ν$

英文摘要：

Following our earlier work we establish kinematic endpoint relations for baryon decays using the Wigner-Eckart theorem and apply them to $\frac{1}{2} \to \frac{1}{2}$ and $\frac{1}{2} \to \frac{3}{2}$ baryon transitions. We provide angular distributions at the kinematic endpoint which hold for the generic $d=6$ model-independent effective Hamiltonian. Moreover, we explicitly verify the endpoint relations using an explicit form factor parametrisation and clarify constraints on helicity based form factors to evidence endpoint relations. Our results provide guidance for phenomenological parameterisations, consistency checks for theory computations and experiment. Results are applicable to ongoing and future new physics searches at LHCb, BES III and Belle II with rare semileptonic-, dineutrino-and charged-modes, which include $Λ_b \to Λ^{(*)} \ell \ell, Λ_b \to Λ^{(*)} νν$, $Ω_b \to Ω\ell \ell$, $Λ_c \to p \ell \ell$, $Σ\to p \ell \ell$ and $Λ_b \to Λ_c^{(*)} \ell ν$

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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