Hard photon bremsstrahlung effects in hyperon semileptonic decays Original Research Article

An efficient Monte Carlo method for photon bremsstrahlung calculations in semileptonic decays is described. This method is useful for order-α radiative correction calculations, and for event generations in off-line Monte Carlo simulation programs. The order-α bremsstrahlung amplitude in hyperon semileptonic decays is given by using the Low-theorem, and the bremsstrahlung amplitude squared is calculated for unpolarized decays. Numerical calculation results are presented for n → pev, μ → ev, vμ, Σ− → nev and Λ → pev decays. The general features of the Monte Carlo method might be useful for photon bremsstrahlung calculations in other decay and collision processes.