我們在無R超對稱標準模型中利用數值方法計算 one loop Feynman圖對 μ and τ 的輻射衰變，即 μ → eγ ，τ → eγ ， 和 τ → μγ 的貢獻，並對結果做定性的分析。在目前實驗數據的限制下，R 宇稱破缺參數空間的允許範圍已經可以藉由數值上的計算精確地得到。 Ref.[7] 也曾做過類似的研究， 但因為其在計算中對 mass eigenstate couplings 做近似，所以得到的結果並不完全精確。本論文則利用精確的mass eigenstate couplings 來做計算，並對兩者的結果加以比較。我們發現在μ*B 的參數空間中，兩者所得到的結果有明顯的差異。 We present a detail analysis together with exact numerical calculations on one loop contributions to the branching ratio of the radiative decay of μ and τ , namely μ → e γ, τ → e γ, and τ → μγ from supersymmtry without R-parity. An exact numerical study is performed to obtain explicit bounds on the parameters under the present experimental limit. A similar work has been performed in the Ref.[7], which used electroweak states as an approximation to the physical particles for the external legs to the loop. However, we use the formula for exact mass eigenstate couplings to calculate the one loop diagrams. We compare the results obtained by using these two approaches in the R-parity violating parameter spaces and discover that they have a sizable difference in the resulted constraints on some μ*B combinations.
