Abstract
We study the production of Higgs boson pairs via gluon fusion at the LHC in the Two-Higgs-Doublet Model. We present predictions at NLO accuracy in QCD, matched to parton showers through the MC@NLO method. A dedicated reweighting technique is used to improve the NLO calculation upon the infinite top-mass limit. We perform our calculation within the MadGraph5 aMC@NLO framework, along with the 2HDM implementation based on the NLOCT package. The inclusion of the NLO corrections leads to large K-factors and significantly reduced theoretical uncertainties. We examine the seven 2HDM Higgs pair combinations using a number of representative 2HDM scenarios. We show how the model-specific features modify the Higgs pair total rates and distribution shapes, leading to trademark signatures of an extended Higgs sector.
Highlights
If effectively realized in Nature, the 2HDM could lead to genuine indications of new physics at colliders
We study the production of Higgs boson pairs via gluon fusion at the LHC in the Two-Higgs-Doublet Model
Multiple Higgs boson production processes are instrumental in this endeavour, because they directly depend on the Higgs self-couplings, and because they are sensitive to possible new heavier states and/or to higher-dimensional operators [43,44,45,46,47,48,49,50]
Summary
Fixing the Higgs mass to mH = 126 GeV, a global fit to electroweak precision observables in terms of the oblique parameters S, T, U [94] yields S = 0.03 ± 0.01, T = 0.05 ± 0.12, and U = 0.03 ± 0.10 [95,96,97] Aside from these conditions connected to the structure of the model, the allowed parameter space shrinks even further as we enforce compatibility with the average LHC Higgs signal strength [98, 99] and the direct collider mass bounds on the heavy neutral [100,101,102,103,104,105,106,107,108,109] and charged Higgs bosons [110,111,112,113].
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