Abstract
The search for di-Higgs production at the LHC in order to set limits on the Higgs trilinear coupling and constraints on new physics is one of the main motivations for the LHC high-luminosity phase. Recent experimental analyses suggest that such analyses will only be successful if information from a range of channels is included. We therefore investigate di-Higgs production in association with two hadronic jets and give a detailed discussion of both the gluon- and the weak boson-fusion (WBF) contributions, with a particular emphasis on the phenomenology with modified Higgs trilinear and quartic gauge couplings. We perform a detailed investigation of the full hadronic final state and find that hhjj production should add sensitivity to a di-Higgs search combination at the HL-LHC with 3 $$\hbox {ab}^{-1}$$ . Since the WBF and GF contributions are sensitive to different sources of physics beyond the Standard Model, we devise search strategies to disentangle and isolate these production modes. While gluon fusion remains non-negligible in WBF-type selections, sizeable new physics contributions to the latter can still be constrained. As an example of the latter point we investigate the sensitivity that can be obtained for a measurement of the quartic Higgs–gauge boson couplings.
Highlights
After the Higgs boson discovery in 2012 [1,2] and subsequent analyses of its properties [3,4], evidence for physics beyond the Standard Model (BSM) remains elusive
Since the weak boson-fusion (WBF) and GF contributions are sensitive to different sources of physics beyond the Standard Model, we devise search strategies to disentangle and isolate these production modes
While gluon fusion remains non-negligible in WBF-type selections, sizeable new physics contributions to the latter can still be constrained
Summary
Given that the cross sections in WBF hh j j production are very suppressed compared to WBF h j j production (the WBF hh j j cross section is ∼750 times smaller), we have to rely on the dominant hadronic Higgs decay modes to be able to observe this final state. This rules out one of the most crucial single Higgs WBF selection tools—the central jet veto [41].
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