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 γ γ → W + W − , e + γ → e+ γ ∗ γ → e + W − W + and e+ e− → e+ γ ∗ γ ∗ e− → e + W − W + e − processes at the Com- pact Linear Collider (CLIC) operating in γ γ , 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 = 1.5 TeV, √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 γ γ → 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 cou- plings 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 .