PHOTOS as precision Monte Carlo for radiative corrections in decays

by Zbigniew Was (Inst. of Nuclear Physics PAS, Cracow)

Friday 26 Nov 2004, 14:00 → 15:00 Europe/Zurich

TH Auditorium (CERN)

PHOTOS, an algorithm for MC simulations of radiative corrections in decays, is widely used in the simulation of such processes as W decays for the Tevatron, τ decays for Belle and others. Recently, this project was revisited. Precision tests were completed, also the program functionality was extended to multiple photon emission, ensuring an overall precision at the permille level and at the 15% level in some corners of phase space. Similarities of this algorithm to some algorithms for parton shower will be mentioned. Also some similarities of spin amplitudes for Z decay with those of e⁺e^- -> ν_e \bar{ν}_e γγ will be mentioned, as they may be of some interest for future applications.