Sensitivity of anomalous quartic gauge couplings via Zγ γ production at future hadron-hadron colliders

Triple gauge boson production provides a promising opportunity to probe the anomalous quartic gauge couplings in understanding the details of electroweak symmetry breaking at future hadron-hadron collider facilities with increasing center of mass energy and luminosity. In this paper, we investigate the sensitivities of dimension-8 anomalous couplings related to the ZZ gamma gamma and Z gamma gamma gamma quartic vertices, defined in the effective field theory framework, via pp -> Z gamma gamma signal process with Z-boson decaying to charged leptons at the high luminosity phase of LHC (HL-LHC) and future facilities, namely the High Energy LHC (HE-LHC) and Future Circular hadron-hadron collider (FCC-hh). We analyzed the signal and relevant backgrounds via a cut based method with Monte Carlo event sampling where the detector responses of three hadron collider facilities, the center-of-mass energies of 14, 27 and 100 TeV with integrated luminosities of 3, 15 and 30 ab-1 are considered for the HL-LHC, HE-LHC and FCC-hh, respectively. The reconstructed 4-body invariant mass of l+l- gamma gamma system is used to constrain the anomalous quartic gauge coupling parameters under the hypothesis of absence of anomalies in triple gauge couplings. Our results indicate that the sensitivity on anomalous quartic couplings fT 8/A4 and fT9/A4 (fT 0/A4, fT1/A4 and fT2/A4) at 95% C.L. for FCC-hh with Lint = 30 ab-1 without systematic errors is two (one) order better than the current experimental limits. Considering a realistic systematic uncertainty such as 10% from possible experimental sources, the sensitivity of all anomalous quartic couplings gets worsen by about 1.2%, 1.7% and 1.5% compared to those without systematic uncertainty for HL-LHC, HE-LHC and FCC-hh, respectively.

Automated summary

This paper investigates the sensitivities of dimension-8 anomalous couplings related to quartic vertices in the effective field theory framework. The study focuses on the pp->Z gamma gamma signal process with Z-boson decaying to charged leptons at the high luminosity phase of LHC (HL-LHC) and future facilities. By analyzing the signal and relevant backgrounds using a cut based method with Monte Carlo event sampling, the researchers found that the sensitivity on anomalous quartic couplings at 95% C.L. for FCC-hh without systematic errors is significantly better than the current experimental limits.