Abstract
The Higgs pair production in gluon fusion is a sensitive probe of beyond-standard model (BSM) phenomena and its detection is a major goal for the LHC and higher energy hadron collider experiments. In this work we reanalyze the possible modifications of the Higgs pair production cross section within low energy supersymmetry models. We show that the supersymmetric contributions to the Higgs pair production cross section are strongly correlated with the ones of the single Higgs production in the gluon fusion channel. Motivated by the analysis of ATLAS and CMS Higgs production data, we show that the scalar superpartners' contributions may lead to significant modification of the di-Higgs production rate and invariant mass distribution with respect to the SM predictions. We also analyze the combined effects on the di-Higgs production rate of a modification of the Higgs trilinear and top-quark Yukawa couplings in the presence of light stops. In particular, we show that due to the destructive interference of the triangle and box amplitude contributions to the di-Higgs production cross section, even a small modification of the top-quark Yukawa coupling can lead to a significant increase of the di-Higgs production rate.
Highlights
A scalar resonance with mass of approximately 125 GeV has been detected at the run-I of the LHC [1,2]
We show that when the gluon, as well as the bottom and top Higgs couplings are allowed to vary within the range consistent with the best fit values of κi, the 2h production may be greatly enhanced compared to the SM predictions
We have computed the leading order (LO) double Higgs production amplitudes depicted in Fig. 2, finding agreement with the results presented in Ref. [5]
Summary
A scalar resonance with mass of approximately 125 GeV has been detected at the run-I of the LHC [1,2]. In order to numerically compute the supersymmetry effects on di-Higgs production we have modified the calculations presented in the public program MCFM-8.0 [43], by including the stop contributions and allowing for possible modifications of the top-quark Yukawa coupling yt and the trilinear Higgs coupling λ3. The current recasting tools only include the data up to 2.3 fb−1 of the 13 TeV Run [62,63], and it is beyond the scope of this work to analyze the exact stop limit in those scenarios In this analysis, we are going to consider stops as light as 300 GeV as a reference value, showing how the effects on the di-Higgs production cross section depend on the exact stop mass bound. The effects may be understood from the contribution of heavy particles to the gluon kinetic term, namely
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