Model-independent limits for anomalous triple gauge bosons W+W− γ couplings at the CLIC

Abstract

In this study, we investigate the potential of the γγ → W+W−, e+ γ → e+ γ ∗ γ → e+W−W+ and e+e− → e+ γ ∗ γ ∗e− → e+W−W+e− processes at the Compact Linear Collider (CLIC) operating in γγ, γ ∗ γ and γ ∗ γ ∗ modes to probe the anomalous triple gauge bosons W+W− γ 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 L = 1 ab−1@ √ s = 0.380 TeV, L = 2.5 ab−1@ √ s = 1.5TeV, L = 5 ab−1@ √ s = 3 TeV and δsys = 0%,5%, 10%, 15% for our study. Using these data, the strongest limits expected with the γγ → W+W−, e+ γ → e+ γ ∗ γ → e+W−W+ and e+e− → e+ γ ∗ γ ∗e− → e+W−W+e− processes on the anomalous κγ and λγ couplings with δsys = 0% at 95% C.L. are: κγ = ±0.00007, λγ = [−0.00004, 0.00102], κγ = ±0.00015, λγ = [−0.00013, 0.00340] and κγ = [−0.00048, 0.00049], λγ = [−0.00048, 0.00782]. The bounds for κγ and λγ with δsys = 5%, 10%, 15% are weaker with respect to the bounds obtained with δsys = 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− γ couplings at the CLIC. In addition, a prominent advantage of these processes is that they isolate anomalous W+W− γ couplings, thus allowing the study of W+W− γ couplings independently from W+W−Z.