Probing anomalous $\gamma \gamma \gamma Z$ couplings through $\gamma Z$ production in $\gamma \gamma$ collisions at the CLIC

Abstract

We have estimated the sensitivity to the anomalous couplings of the $\gamma \gamma \gamma Z$ vertex in the $\gamma \gamma \to \gamma Z$ scattering of the Compton backscattered photons at the CLIC. Both polarized and unpolarized collisions at the $e^{+}{e}^{-}$ energies 1500 GeV and 3000 GeV are addressed, and anomalous contributions to helicity amplitudes are derived. The differential and total cross sections are calculated. We have obtained 95\% C.L. exclusion limits on the anomalous quartic gauge couplings (QGCs). They are compared with corresponding bounds derived for the $\gamma \gamma \gamma Z$ couplings via $\gamma Z$ production at the LHC. The constraints on the anomalous QGCs are one to two orders of magnitude more stringent that at the HL-LHC. The partial-wave unitarity constraints on the anomalous couplings are examined. It is shown that the unitarity is not violated in the region of the anomalous QGCs studied in the paper.

arXiv comment29 pages, 7 figures, 3 tables; minor corrections to the text, 4 references added

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