On radiative corrections to the strangeness-conserving β-decay of free baryons (vol 62, pg 648, 1999)

In the work presented, the effect of electromagnetic interactions on the strangeness-conserving beta-decay of baryons: neutron, n --> p + e(-) + <(nu)over bar> + gamma,and hyperon, Sigma(+/-) --> Lambda(0) + e(+/-) + nu(<(nu)over bar>) + gamma, is visualized. The polarized baryon decay studied, the total decay probability modification, as well as the modifications of the e(+/-) spectrum and the angular distribution with respect to the polarization vector xi of the initial baryon (coefficient A), have been calculated. Dependence of the results on the value of the ultraviolet cut-off parameter Lambda is elucidated. The spectrum and yield of the gamma-radiation accompanying the beta-decay is acquired, with special attention being paid to the infrared (soft-photon) radiation. The photon radiation of pions constituting the baryon's "pion cloud" is investigated. The radiative corrections to the total beta-decay probability and to the electron energy and angular distributions found in this work proves to be of pivotal importance for obtaining the main characteristics of the weak interaction from experimental data processing. (C) 2000 MAIK "Nauka/Interperiodica".