Sensitivities on the anomalous quartic $\gamma\gamma\gamma\gamma$ and $\gamma \gamma\gamma Z$ couplings at the CLIC

TL;DR

This paper investigates the potential to detect anomalous quartic gauge couplings involving photons and Z bosons at the CLIC collider, using a specific process and considering various experimental conditions, to improve sensitivity to new physics effects.

Contribution

It provides the first detailed sensitivity analysis of dimension-8 operators affecting quartic gauge couplings at CLIC with polarized beams and systematic uncertainties.

Findings

Sensitivity to anomalous couplings improved by up to 200 times.

Polarized electron beams significantly enhance detection sensitivity.

Results surpass current experimental bounds for these couplings.

Abstract

It is essential to directly investigate the self-couplings of gauge bosons in the Standard Model (SM) due to its non-Abelian nature, as these couplings play a significant role in comprehending the gauge structure of the model. The discrepancies between the Standard Model's expectations and the measured value of gauge boson self-couplings would serve as strong evidence towards the existence of new physics phenomena that extend beyond the Standard Model. Such deviations could provide valuable insights into the nature of new physics and potentially lead to a deeper understanding of fundamental particles and their interactions. In this study, we examine the sensitivities of anomalous couplings associated with dimension-8 operators that affect the $\gamma \gamma \gamma \gamma$ and $Z \gamma \gamma \gamma$ quartic vertices. The study focuses on the process $e^- \gamma \to e^-\gamma\gamma$ with the incoming photon under Weizs\"acker-Williams approximation at the stage-3 scenerio of Compact Linear Collider (CLIC) that is refer to a CoM energy of 3 TeV. Due to the CLIC options, we take into account the both unpolarized and $\mp80\%$ polarized electron beam with the related integrated luminosities of ${\cal L}=5, 4, 1$ $\rm ab^{-1}$ under the systematic uncertainties of $\delta_{sys}=0, 3, 5$. Obtained sensitivities on the anomalous quartic gauge couplings (aQGCs) for the process $e^- \gamma \to e^-\gamma\gamma$ at $\sqrt{s}= 3$ TeV and various polarizations, are improved by a factor of 2-200 times better for the couplings $f_{T,j}/\Lambda^4$ compared with the experimental results.