Z production, processes 31-33

These processes represent the production of a Z boson which subsequently decays either into electrons (nproc=31), neutrinos (nproc=32) or bottom quarks (nproc=33). Where appropriate, the effect of a virtual photon is also included. As noted above, in these latter cases m34min > 0 is obligatory. The calculation may be performed at NLO, although the NLO calculation of process 33 does not include radiation from the bottom quarks (i.e. radiation occurs in the initial state only).

When removebr is .true. in process 31, the Z boson does not decay.