The pursuit of discovery in particle physics has always required study at the highest possible energies. Multi-TeV muon colliders, which have important advantages, offer unprecedented potential for investigating new physics beyond the Standard Model. We extensively assume a range of center-of-mass energies from 3 to 100 TeV and a range of integrated luminosities from 1 to 1000 ab −1 for future multi-TeV muon colliders. We perform a phenomenological study of the anomalous W W γ couplings via the process µ + µ − → µ + γ * µ − → µ + W − ν µ using a model-independent analysis in the effective field theory framework at multi-TeV muon colliders. All signal events in the existence of anomalous c W W W /Λ 2 , c W /Λ 2 and c B /Λ 2 couplings and the relevant background events are calculated in MadGraph. The sensitivity estimates obtained for the anomalous W W γ couplings at systematic uncertainties of δ sys = 0, 3, 5% are compared with the experimental results.Our best sensitivity limits at 95% confidence level for c W W W /Λ 2 , c W /Λ 2 and c B /Λ 2 couplings are [−0.0000329; 0.0000241] TeV −2 , [−0.025594; 0.029431] TeV −2 and [−0.025634; 0.029427] TeV −2 at the multi-TeV muon collider with center-of-mass energy of 100 TeV and integrated luminosity of 1000 ab −1 , respectively.
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.
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