PYBBWH: A program for associated charged Higgs and W boson production

The Monte Carlo program, PYBBWH, is an implementation of the associated production of a charged Higgs and a W boson from bb̄ fusion in a general TwoHiggs-Doublet model for both CP-conserving and CP-violating couplings. It is implemented as a external process to Pythia 6. The code can be downloaded from http://www.isv.uu.se/thep/MC/pybbwh. 1 Associated H and W boson production The program, PYBBWH, is an implementation of the production of a charged Higgs boson, H, in association with a W boson. The code was developed for the research presented in [1] where details on the theory and numerical results are presented. This program is written for a general Two-Higgs-Doublet model type II. The dominant production mode at tree level occurs is via bb̄ fusion and at one-loop-level via gluon fusion. This program implements the leading order bb̄ fusion part and the relevant Feynman diagrams are given in figure 1. By only including bb̄ fusion this program is most suited for intermediate H masses and large tanβ. In a general type II 2HDM the couplings relevant for this production can be specified via the Higgs mixing matrix Oji in the following way gHiH−W+ = g ∗ HiHW = O2i cos β − O1i sin β + iO3i , gHib̄b = O1i + iO3i sin β . (1) In a real 2HDM were Hi = {h , H, A} the mixing matrix has the simple form