Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 31: Elektroschwache Wechselwirkung und BSM (Theorie)
T 31.1: Gruppenbericht
Montag, 29. Februar 2016, 16:45–17:05, VMP8 SR 105
NLO QCD Corrections to Higgs Pair Production including Dimension-6 Operators — Ramona Gröber1, Margarete Mühlleitner2, Michael Spira3, and •Juraj Streicher2 — 1INFN - Sezione di Roma Tre, Roma, Italy — 2Karlsruher Institut für Technologie - Institut für Theoretische Physik, Karlsruhe, Germany — 3Paul Scherrer Institut, Villigen, Switzerland
The role of the Higgs boson has developed from the long-sought particle into a tool for exploring beyond Standard Model (BSM) physics. While the Higgs boson signal strengths are close to the values predicted in the Standard Model (SM), the trilinear Higgs-selfcoupling can still deviate significantly from the SM expectations in some BSM scenarios. The Effective Field Theory (EFT) framework provides a way to describe these deviations in a rather model independent way, by including higher-dimensional operators which modify the Higgs boson couplings and induce novel couplings not present in the SM.
The trilinear Higgs-selfcoupling is accessible in Higgs pair production, for which the gluon fusion is the dominant production channel. The next-to-leading (NLO) QCD corrections to this process are important for a proper prediction of the cross section and are known in the limit of heavy top quark masses. In our work, we provide the NLO QCD corrections in the large top quark mass limit to Higgs pair production including dimension-6 operators. The various higher-dimensional contributions are affected differently by the QCD corrections, leading to deviations in the relative NLO QCD corrections of several per-cent, while modifying the cross section by up to an order of magnitude.