K+介子的三体轻子衰变

本文利用色散关系方法,假设普适V-A弱相互作用和奇异矢量流不守恒,从而对形状因子f₀,f₁的色散关系进行一次减去,计算了K_μ3⁺、K_e3⁺衰变中的π⁰能谱,K_μ3⁺衰变中的μ⁺能谱和μ⁺的纵向极化。计算中只考虑了K₁^*(m_*=888MeV)中间态对色散积分的贡献。参数σ取为+2.1的结果和实验在误差范围内相符合。放弃奇异矢量流部分守恒假设与实验符合的程度比保持这一假设要好一些。

THREE-BODY LEPTONIC DECAYS OF THE K+ MESON

The energy spectra of π⁰ in K_μ3⁺ and K_e3⁺ decays, and the energy spectrum and longitudinal polarization of μ⁺ in K_μ3⁺ decay have been calculated by the dispersion relation method on the assumptions that 1) the weak interaction is of a universal V-A form and 2) the strange vector current is not conserved. Consequently one subtraction is made for each of the dispersion relation for the form factors f₀ and f₁. Only the contribution of K₁^* (m_* = 888 MeV) intermediate state is considered in the calculations. If the parameter defined in the paper is assumed to be equal to 2.1, the results agree with experiments within their limits of errors. Thus, better agreement with experiments could be achieved by abandoning the assumption of partially conserved strange vector current.