Study of anomalous $WW\gamma\gamma$ coupling sensitivity at the Compact   Linear Collider
  The Compact Linear Collider (CLIC) is one of the most popular linear colliders, planned to realize $e^{-}e^{+}$ collisions in three energy stages of $0.5$, $1.5$, and $3$ TeV. It has an energy scale never reached by any existing lepton collider. In this study, we present the sensitivity studies of the $WW\gamma\gamma$ anomalous quartic gauge boson coupling (aQGC) in the three different processes $e^{+}e^{-}\rightarrow W^{-} W^{+}\gamma$, $e^{+}e^{-} \rightarrow e^{+}\gamma^{*} e^{-} \rightarrow e^{+} W^{-} \gamma \nu_{e}$, and $e^{+}e^{-} \rightarrow e^{+}\gamma^{*} \gamma^{*} e^{-} \rightarrow e^{+} W^{-} W^{+} e^{-}$ at the CLIC. We obtained $95\%$ confidence level limits on the aQGC parameters $\frac{a_{0}}{\Lambda^{2}}$ and $\frac{a_{c}}{\Lambda^{2}}$ at various integrated luminosities and center-of-mass energies. The best limits obtained on the aQGCs $\frac{a_{0}}{\Lambda^{2}}$ and $\frac{a_{c}}{\Lambda^{2}}$ in these processes are at the order of $10^{-2}$ TeV$^{-2}$ and $10^{-1}$ TeV$^{-2}$, respectively. 
M. Koksal
hep-ph