Model-independent study on the anomalous $ZZγ$ and $Zγγ$ couplings at the future muon collider

Abstract

In this study, we investigate the potential of µ − µ + → Zγ → ν νγ process at the future muon collider with a center-of-mass energy of 3 TeV to examine the anomalous ZZγ and Zγγ neutral triple gauge couplings defining CP -conserving C BW /Λ 4 coupling and three CP -violating C BB /Λ 4 , C BW /Λ 4 , C W W /Λ 4 couplings. All signal and relevant background events are generated in Mad-Graph and passed through Pythia for parton showering and hadronization at parton level. Detector effects are also considered via tuned muon detector cards in Delphes to obtain best generator level cuts. The effects of systematic uncertainties of 0%, 3% and 5% on the sensitivities are studied. The best sensitivities obtained from the process µ − µ + → Zγ → ν νγ are [−6.53; 6.64] × 10 −2 TeV −4 on CP -conserving C BW /Λ 4 coupling and [−2.47; 2.47] × 10 −2 TeV −4 , [−8.46; 8.46] × 10 −2 TeV −4 and [−2.20; 2.20]×10 −1 TeV −4 on CP -conserving C BB /Λ 4 , C BW /Λ 4 , C W W /Λ 4 couplings , respectively.We show that our results on the anomalous neutral gauge couplings set more stringent sensitivity, between 5-15 times of magnitude, than the experimental results.