Search for anomalous quartic $ZZ\gamma\gamma$ couplings in photon-photon collisions

TL;DR

This paper investigates the potential of future photon-photon and electron-photon collisions at the CLIC to detect anomalous quartic $ZZ\gamma\gamma$ couplings, providing sensitivity estimates for new physics beyond the Standard Model.

Contribution

It presents the first detailed sensitivity analysis of anomalous $ZZ\gamma\gamma$ couplings at the 3 TeV CLIC using multiple processes and calculates the best bounds on specific dimension-8 operators.

Findings

Best bounds on anomalous couplings are achieved via $\gamma\gamma ightarrow ZZ$ process.

Sensitivity to couplings improves with higher integrated luminosity.

The study provides specific numerical limits on dimension-8 operator coefficients.

Abstract

The self-couplings of the electroweak gauge bosons are completely specified by the non-Abelian gauge nature of the Standard Model (SM). The direct study of these couplings provides a significant opportunity to test the validity of the SM and the existence of new physics beyond the SM up to the high energy scale. For this reason, we investigate the potential of the processes $\gamma\gamma\rightarrow ZZ$, $e^{-}\gamma\rightarrow e^{-}\gamma^{*}\gamma \rightarrow e^{-}Z\, Z$ and $e^{+}e^{-} \rightarrow e^{+}\gamma^{*} \gamma^{*} e^{-} \rightarrow e^{+}\, Z\, Z\, e^{-}$ to examine the anomalous quartic couplings of $ZZ\gamma\gamma$ vertex at the Compact Linear Collider (CLIC) with center-of-mass energy $3$ TeV. We calculate $95\%$ confidence level sensitivities on the dimension-8 parameters with various values of the integrated luminosity. We show that the best bounds on the anomalous $\frac{f_{M2}}{\Lambda^{4}}$, $\frac{f_{M3}}{\Lambda^{4}}$, $\frac{f_{T0}}{\Lambda^4}$ and $\frac{f_{T9}}{\Lambda^4}$ couplings arise from $\gamma\gamma\rightarrow ZZ$ process among those three processes at center-of-mass energy of 3 TeV and integrated luminosity of $L_{int}=2000$ fb$^{-1}$ are found to be $[-3.30;3.30]\times 10 ^{-3}$ TeV$^{-4}$, $[-1.20;1.20]\times 10 ^{-2}$ TeV$^{-4}$, $[-3.40;3.40]\times 10 ^{-3}$ TeV$^{-4}$ and $[-1.80;1.80]\times 10 ^{-3}$ TeV$^{-4}$, respectively.