Improved description of charged Higgs boson production at hadron colliders

We present a new method for matching the two twin-processes gb → Ht and gg → Htb in Monte Carlo event generators. The matching is done by defining a double-counting term, which is used to generate events that are subtracted from the sum of the two twin-processes. In this way we get a smooth transition between the collinear region of phase space, which is best described by gb → Ht, and the hard region, which requires the use of the gg → Htb process. The resulting differential distributions show large differences compared to both the gb → Ht and gg → Htb processes illustrating the necessity to use matching both when tagging and not tagging the accompanying b-jet.