Abstract
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 \( \left(v\overline{v}/{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-}\right)\gamma \gamma \) final states. We study the sensitivity of this channel to the \( {\mathcal{O}}_{\varphi q}^{(1)},\kern0.5em {\mathcal{O}}_{\varphi q}^{(3)},\kern0.5em {\mathcal{O}}_{\varphi u} \), and \( {\mathcal{O}}_{\varphi d} \) 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 \( {\mathcal{O}}_{\varphi q}^{(3)} \), we demonstrate that binning in the Zh rapidity has the potential to improve the reach on \( {\mathcal{O}}_{\varphi q}^{(1)} \). 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 \( {\mathcal{O}}_{\varphi q}^{(3)} \) 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 \( {\mathcal{O}}_{\varphi q}^{(3)} \), reaching a precision of |δg1z| ≲ × 10−4 on the deviations in the ZWW interactions.
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Bishara, F., De Curtis, S., Rose, L.D. et al. Precision from the diphoton Zh channel at FCC-hh. J. High Energ. Phys. 2021, 154 (2021). https://doi.org/10.1007/JHEP04(2021)154
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DOI: https://doi.org/10.1007/JHEP04(2021)154