Model-independent limits for anomalous triple gauge bosons $W^+W^-\gamma$ couplings at the CLIC

Abstract

In this study, we investigate the potential of the $\gamma \gamma \rightarrow W^+ W^-$, $e^+ \gamma \rightarrow e^+ \gamma ^{*}\gamma \rightarrow e^+ W^- W^+$ and $e^+ e^-\rightarrow e^+ \gamma ^{*} \gamma ^{*} e^-\rightarrow e^+ W^- W^+ e^-$ processes at the Compact Linear Collider (CLIC) operating in $\gamma \gamma$, $\gamma ^*\gamma$ and $\gamma ^*\gamma ^*$ modes to probe the anomalous triple gauge bosons $W^+W^-\gamma$ couplings. To identify the $W^+W^-$ production in the final state, we consider the leptonic, semi-leptonic and hadronic decays channels. Based on future CLIC data, we assume ${{\mathcal {L}}}=1\,\mathrm{ab^{-1}}@ \sqrt{s}=0.380 \,\mathrm{TeV}$, ${{\mathcal {L}}}=2.5\,\mathrm{ab^{-1}}@ \sqrt{s}=1.5\,\mathrm{TeV}$, ${{\mathcal {L}}}=5 \,\mathrm{ab^{-1}}@ \sqrt{s}=3\,\mathrm{TeV}$ and $\delta _{sys}=0\%, 5\%, 10\%, 15\%$ for our study. Using these data, the strongest limits expected with the $\gamma \gamma \rightarrow W^+ W^-$, $e^+ \gamma \rightarrow e^+ \gamma ^{*}\gamma \rightarrow e^+ W^- W^+$ and $e^+ e^-\rightarrow e^+ \gamma ^{*} \gamma ^{*} e^-\rightarrow e^+ W^- W^+ e^-$ processes on the anomalous $\Delta \kappa _\gamma$ and $\lambda _\gamma$ couplings with $\delta _{sys}=0\%$ at $95\%$ C.L. are: $\Delta \kappa _\gamma = \pm 0.00007$, $\lambda _\gamma = [-0.00004, 0.00102]$, $\Delta \kappa _\gamma = \pm 0.00015$, $\lambda _\gamma = [-0.00013, 0.00340]$ and $\Delta \kappa _\gamma = [-0.00048, 0.00049]$, $\lambda _\gamma = [-0.00048, 0.00782]$. The bounds for $\Delta \kappa _\gamma$ and $\lambda _\gamma$ with $\delta _{sys}=5\%, 10\%, 15\%$ are weaker with respect to the bounds obtained with $\delta _{sys}=0\%$. These limits show potential sensitivity when compared with those from LHC and HL-LHC data and can be a very promising option to probe the anomalous $W^+W^-\gamma$ couplings at the CLIC. In addition, a prominent advantage of these processes is that they isolate anomalous $W^+W^-\gamma$ couplings, thus allowing the study of $W^+W^-\gamma$ couplings independently from $W^+W^-Z$.