Radiative corrections in K-l3(0) decays

摘要

We calculate the long-distance radiative corrections delta(e)(LD) and delta(mu)(LD) to the K-0 -> pi(-)e(+)v(e) and the K-0 -> pi(-)mu(+)v(mu) decay rates. This analysis includes contributions to the long-distance radiative corrections from outside the kinematically allowed three-body Dalitz region and tests the sensitivity of the radiative corrections to the hadronic K-pi form factors. A program, KLOR, was written to numerically evaluate the radiative corrections and to generate Monte Carlo events for experimental acceptance studies. The K-e3(0) and the K-mu 3(0) long-distance radiative correction parameters are determined to be (1.3 +/- 0.3)% and (1.9 +/- 0.3)%, respectively. We also present predictions for the fraction of radiative K-l3(0) events satisfying various requirements on final-state photon kinematics. (c) 2006 Elsevier Inc. All rights reserved.