Precision from the diphoton Zh channel at FCC-hh

The future 100 TeV FCC-hh hadron collider will give access to rare but clean final states which are out of reach of the HL-LHC. One such process is the Zh production channel in the (vv¯ / ℓ +ℓ −) γγ final states. We study the sensitivity of this channel to the Oφq(1),Oφq(3),Oφu, and Oφd SMEFT operators, which parametrize deviations of the W and Z couplings to quarks, or, equivalently, anomalous trilinear gauge couplings (aTGC). While our analysis shows that good sensitivity is only achievable for Oφq(3), we demonstrate that binning in the Zh rapidity has the potential to improve the reach on Oφq(1). Our estimated bounds are one order of magnitude better than projections at HL-LHC and is better than global fits at future lepton colliders. The sensitivity to Oφq(3) is competitive with other channels that could probe the same operator at FCC-hh. Therefore, combining the different diboson channels sizeably improves the bound on Oφq(3), reaching a precision of |δg1z| ≲ × 10−4 on the deviations in the ZWW interactions.