Light quark Yukawas in triboson final states

Abstract

Triple heavy vector boson production, $pp\to VVV$ $(V=W,Z)$, has recently been observed for the first time. We propose that precision measurements of this process provide an excellent probe of the first generation light quark Yukawa couplings. Modified quark interactions with the off-shell Higgs in this process lead to a rapid growth of the partonic cross sections with energy, which manifests in an enhanced $p_T$ distribution of the final state leptons and quarks. We quantify this effect and estimate the present and future 2$\sigma$ sensitivity to the up, down, and strange Yukawas. In particular, we find that HL-LHC can reach $\mathcal{O}(400)$ sensitivity to the down Yukawa relative to the Standard Model value, improving the current sensitivity in this process by a factor of $10$, and which can be further improved to $\mathcal{O}(30)$ at FCC-hh. This is competitive with and complementary to constraints from global fits and other on-shell probes of the first generation Yukawas. The triboson sensitivity at HL-LHC corresponds to probing dimension-6 SMEFT operators suppressed by an $\mathcal{O}(1)$ TeV scale, similarly to other LHC Higgs probes.

22 pages, 6 figures

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Cited by in corpus (10)

• Cancellation in Dark Matter-Nucleon Interactions: the Role of Non-Standard-Model-like Yukawa Couplings
• Machine learning the trilinear and light-quark Yukawa couplings from Higgs pair kinematic shapes
• Locally finite two-loop QCD amplitudes from IR universality for electroweak production
• Observation of WW$\gamma$ production and search for H$\gamma$ production in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• How large can the Light Quark Yukawa couplings be?
• Off-shell probes of the Higgs Yukawa couplings: light quarks and charm
• Probing Higgs-muon interactions at a multi-TeV muon collider
• A sensitivity study of triboson production processes to dimension-6 EFT operators at the LHC
• Unveiling Light-Quark Yukawa Flavor Structure via Dihadron Fragmentation at Lepton Colliders
• New physics in triboson event topologies