Abstract
We consider the potential of the Higgs boson pair production process to probe the light quark Yukawa couplings. We show within an effective theory description that the prospects of constraining enhanced first generation light quark Yukawa couplings in Higgs pair production are similar to other methods and channels, due to a coupling of two Higgs bosons to two fermions. Higgs pair production can hence also probe if the Higgs sector couples non-linearly to the light quark generations. For the second generation, we show that by employing charm tagging for the Higgs boson pair decaying to c overline{c} γγ, we can obtain similarly good prospects for measuring the charm Yukawa coupling as in other direct probes.
Highlights
For the Yukawa couplings to the first and second generation quarks, denoted as light quark Yukawa couplings, the current best limits are obtained from a global fit to
For comparison of the results with modified Yukawa couplings with the SM results, we define as a benchmark point the case where all first and second generation quark Yukawa couplings are scaled to the SM bottom Yukawa coupling, which we will refer to in plots and tables as ghqq
In the we can conclude that for the ggF process we can improve on the leading order (LO) predictions by using SM K-factors and that the effects of light Yukawa coupling modifications for the ggF process are small for the still allowed modifications
Summary
For a model with vector-like quarks and strongly enhanced light quark Yukawa couplings Another realisation of large first and second generation Yukawa couplings without tree-level flavour-changing neutral currents (FCNCs) has been discussed in [52], and is referred to as spontaneous flavour violation. We would like to stress that from a UV perspective it makes sense to assume that if there is a modification in the light quark Yukawa couplings with respect to the SM, deviations in the di-Higgs production process can be expected, which in the limit of heavy new physics can be traced back to a coupling of two Higgs boson to two fermions.
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