GENTLE/4fan v. 2.0 A program for the semi-analytic calculation of predictions for the process e+e− → 4f Original Research Article

We describe version 2.0 of the Fortran program GENTLE/4fan for the semi-analytic computation of cross sections and distributions in four-fermion production in e+e− annihilation. GENTLE/4fan covers all charged current and neutral current four-fermion final states with no identical particles, no electrons, and no electron neutrinos in the final state. Initial state radiation representing the most relevant quantum corrections and anomalous triple gauge boson couplings have been included.