21 f(-p1) + f(-p2) W+(ν(p3) + e+(p4)) + b(p5) + b(p6)

21.1 W + bb production (mb = 0), processes 21,26

This process is calculable at leading LO and next-to-leading order NLO. These processes are identical to 20 and 25 except for the fact that the bottom quark mass is neglected. Processes nproc=20,25 with a massive b-quark should be used in preference. However processes nproc=21,26 run considerably faster than the corresponding processes with the mass for the b quark, (nproc=20,25). In circumstances where both b quarks are at large transverse momentum, the inclusion of the mass for the b-quark is not mandatory and a good estimate of the cross section may be obtained by using these processes.

When removebr is true, the W boson does not decay.

21.2 Plotter

nplotter_Wbbmas.f is the default plotting routine.

21.3 Example input and output file(s)

input21.ini process21.out