Production of a Higgs pseudoscalar plus two jets in hadronic collisions

TL;DR

The paper analyzes production of a Higgs pseudoscalar with two jets in hadronic collisions in the heavy-top limit using an effective gluon coupling. It computes massless-parton helicity amplitudes for gg->ggA, gg->qqA, and qq->qqA with spinor-helicity methods, and finds that pseudoscalar amplitudes are almost identical in form to the scalar case, differing mainly in overall size and signs. The numerical results at 14 TeV show cross sections of a few tenths of a picobarn, with gg and qg initiated processes dominant; the amplitudes vanish when the pseudoscalar momentum goes to zero. These results furnish the real-emission part of the NLO corrections for Higgs pseudoscalar production and inform CP-odd Higgs phenomenology in extended Higgs sectors.

Abstract

We consider the production of a Higgs pseudoscalar accompanied by two jets in hadronic collisions. We work in the limit that the top quark is much heavier than the Higgs pseudoscalar and use an effective Lagrangian for the interactions of gluons with the pseudoscalar. We compute the amplitudes involving: 1) four gluons and the pseudoscalar, 2) two quarks, two gluons and the pseudoscalar and 3) four quarks and the pseudoscalar. We find that the pseudoscalar amplitudes are nearly identical to those for the scalar case, the only differences being the overall size and the relative signs between terms. We present numerical cross sections for proton-proton collisions with center-of-mass energy 14 TeV.