τ→VV ν_τ衰变中的极化可观测量
Polarized observables in $τ\to VV ν_τ$ decays
AI总结:
研究τ⁻→V₁⁻V₂⁰ν_τ衰变中的极化可观测量,采用广义隐藏局部对称框架内的螺旋度形式主义,预测分支比并得出纵向极化分数f_L结果,为非轻子粲衰变极化模式研究提供关键信息。
AI中文摘要:
我们在广义隐藏局部对称框架内,使用螺旋度形式主义研究了τ⁻→V₁⁻V₂⁰ν_τ衰变中的极化可观测量,其中(V₁⁻, V₂⁰)=(ρ⁻, ρ⁰), (ρ⁻, ω), (K⁻*, ρ⁰), (K⁻*, ω), (ρ⁻, K⁻*⁰)。预测的分支比与有效手征模型的相当,但小于角动量代数模型的。纵向极化分数f_L的结果表明,在τ质量尺度上存在对端点极限(f_L = 1/3)的不可忽略的修正。未来在 Belle II 对τ⁻→V₁⁻V₂⁰ν_τ衰变的f_L测量将为非轻子粲衰变中观察到的极化模式提供关键信息。
英文摘要:
We study polarization observables in $τ^- \to V_1^- V_2^0 ν_τ$ decays for $(V_1^-, V_2^0)=(ρ^-, ρ^0), (ρ^-, ω), (K^{*-}, ρ^0), (K^{*-}, ω), (ρ^-, \bar{K}^{*0})$ using the helicity formalism within the generalized hidden local symmetry framework. The predicted branching fractions are comparable with those from the effective chiral model, but smaller than those from the angular momentum algebra model. Our results for the longitudinal polarization fractions $f_L$ indicate that nonnegligible corrections to the endpoint limit ($f_L = 1/3$), a consequence of Lorentz symmetry, are present at the scale of tau mass. Future measurements of $f_L$ at Belle II for $τ^- \to V_1^- V_2^0 ν_τ$ decays will provide crucial information on polarization patterns observed in nonleptonic charm decays.