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

12.1 W + b production, processes 12,17

These processes represent the production of a W boson which subsequently decays leptonically, in association with a single bottom quark, exploiting the weak transitions c b and u b. This is produced at leading order by an initial state which contains a charm quark (or the CKM suppressed u quark) and a gluon, e.g c(-p1) + g(p2) W+(ν(p3) + e+(p4)) + b(p5) and u(-p1) + g(p2) W+(ν(p3) + e+(p4)) + b(p5) or the charge conjugate processes for W-. This process is somewhat analogous to single top production.

The effect of the bottom quark mass is included throughout the calculation. For this case the CKM matrix elements V cb and V ub, (if they are equal to zero in the input data file, mdata.f) are set equal to 0.041 and 0.00347 respectively. Otherwise the non-zero values specified in mdata.f are used. The calculation of this process may be performed at LO and NLO.

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

12.2 Plotter

nplotter_auto.f is the default plotting routine.

12.3 Example input and output file(s)

input12.ini process12.out