Doubly Charged Higgs Boson Production at Hadron Colliders
Benjamin Fuks, Miha Nemevšek, Richard Ruiz
We present a systematic comparison of doubly charged Higgs boson production mechanisms at hadron colliders in the context of the Type II Seesaw model, emphasizing the importance of the higher-order corrections and subdominant channels. We consider the Drell-Yan channel at next-to-leading order in QCD, production via photon fusion at the leading order, gluon fusion with resummation of the threshold logarithms up to next-to-next-to-next-to-leading logarithmic accuracy, and same-sign weak boson fusion at next-to-leading order in QCD. For the Drell-Yan process, we study the impact of a static jet veto at next-to-leading-order matched to the resummation of jet veto scale logarithms at next-to-next-to-leading logarithmic accuracy. For the photon fusion channel, the dependence on modeling photon parton distribution functions is definitively assessed. To model vector boson fusion at next-to-leading order, we include all interfering topologies at O(α4) and propose a method for introducing generator-level cuts within the MC@NLO formalism. Our results are obtained using a Monte Carlo tool chain linking the \textsc{FeynRules}, \textsc{NloCT} and \textsc{MadGraph5\_aMC@NLO} programs and have necessitated the development of new, publicly available, Universal FeynRules Output libraries that encode the interactions between the Type II Seesaw scalars and the Standard Model particles. Libraries are compatible with both the normal and inverted ordering of the Majorana neutrino masses.