Investigation of anomalous triple gauge couplings in $\mu\gamma$ collision at multi-TeV muon colliders

TL;DR

This study explores the potential of future multi-TeV muon colliders to detect anomalous triple gauge couplings using a model-independent effective field theory approach, providing sensitivity estimates across various energies and luminosities.

Contribution

It offers the first comprehensive sensitivity analysis of anomalous $WW\gamma$ couplings at multi-TeV muon colliders within an effective field theory framework.

Findings

Best sensitivity limits for couplings are around 0.025 TeV$^{-2}$ at 30 TeV energy.

Sensitivity improves with higher energy and luminosity, reaching 90 ab$^{-1}$.

Systematic uncertainties affect the precision of the coupling measurements.

Abstract

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 30 TeV and a range of integrated luminosities from 1 to 90 ab$^{-1}$ for future multi-TeV muon colliders. We perform a phenomenological study of the anomalous $WW\gamma$ couplings via the process $\mu^+ \mu^-\,\rightarrow\,\mu^+\gamma^* \mu^-\,\rightarrow\,\mu^+\ell^-\nu_\ell \bar{\nu}_\ell$ using a model-independent analysis in the effective field theory framework at multi-TeV muon colliders. The sensitivity estimates obtained for the anomalous $WW\gamma$ couplings at systematic uncertainties of $\delta_{sys}=0$, $3$, $5\%$ are compared with the experimental results. Our best sensitivity limits at 95$\%$ confidence level for $c_{WWW}/{\Lambda^2}$, $c_{\widetilde{W}WW}/\Lambda^2$, $c_{B}/{\Lambda^2}$, $c_{W}/{\Lambda^2}$ and $c_{\widetilde{W}}/\Lambda^2$ couplings are $[-0.030; 0.025]\,\text{TeV}^{-2}$, $[-0.014; 0.014]\,\text{TeV}^{-2}$, $[-0.185; 0.187]\,\text{TeV}^{-2}$, $[-0.187; 0.189]\,\text{TeV}^{-2}$ and $[-1.177; 1.097]\,\text{TeV}^{-2}$ at the multi-TeV muon collider with center-of-mass energy of 30 TeV and integrated luminosity of 90 ab$^{-1}$, respectively.