The Scale of New Physics from the Higgs Couplings to gg

TL;DR

Precise measurements of Higgs couplings can reveal signs of new physics beyond the Standard Model, with unitarity bounds indicating potential new physics at around 10 TeV, accessible by future colliders.

Contribution

This work extends unitarity bound analyses to the Higgs coupling to gluons, providing new insights into the energy scale of potential new physics.

Findings

New physics scale could be as low as ~10 TeV.

Future 100-TeV collider can probe this scale.

HL-LHC can indirectly test these bounds.

Abstract

Measuring the Higgs couplings accurately at colliders is one of the best routes for finding physics Beyond the Standard Model (BSM). If the measured couplings deviate from the SM predictions, then this would give rise to energy-growing processes that violate tree-level unitarity at some energy scale, indicating new physics. In this paper, we extend previous work on unitarity bounds from the Higgs potential and the Higgs couplings to vector bosons, the top quark, $\gamma\gamma$ and $\gamma Z$; to the Higgs coupling to gg. We show that the scale of new physics could be as low as $\sim 10$ TeV, which although beyond the reach of the LHC, is well within the reach of the future 100-TeV collider, and can also be probed indirectly in the High Luminosity LHC (HL-LHC).