Higgs Pair Production in the 2HDM: Impact of Loop Corrections to the Trilinear Higgs Couplings and Interference Effects on Experimental Limits
arxiv(2024)
摘要
The results obtained at the LHC for constraining the trilinear Higgs
self-coupling of the detected Higgs boson at about 125 GeV, λ_hhh,
via the Higgs pair production process have significantly improved during the
last years. We investigate the impact of potentially large higher-order
corrections and interference effects on the comparison between the experimental
results and the theoretical predictions for the pair production of the 125 GeV
Higgs boson at the LHC. We use the theoretical framework of the Two Higgs
Doublet Model (2HDM), containing besides the SM-like CP-even Higgs
boson h a second CP-even Higgs boson H, which we assume to be
heavier, m_H > m_h. We analyze in particular the invariant mass distribution
of the two produced Higgs bosons and show that the loop corrections to the
trilinear Higgs couplings λ_hhh and λ_hhH as well as
interference contributions give rise to important effects both for the
differential and the total cross section. We point out the implications for the
experimental limits that can be obtained in the 2HDM for the case of the
resonant production of the heavy Higgs boson H. We emphasize the importance
of the inclusion of interference effects between resonant and non-resonant
contributions in the experimental analysis for a reliable determination of
exclusion bounds for a heavy resonance of an extended Higgs sector.
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