Sensitivity analysis for the anomalous $W^+W^-\gamma$ couplings at the LHeC and the FCC-he

TL;DR

This paper investigates the sensitivity of future electron-proton colliders to anomalous W+W−γ couplings through W-pair production, providing new limits that surpass current experimental bounds and highlighting the potential of these colliders.

Contribution

The study offers the first detailed sensitivity analysis of the LHeC and FCC-he colliders for anomalous W+W−γ couplings in various decay channels, with improved limits over existing measurements.

Findings

Best limits for Δκγ are between -0.00208 and 0.00206.

Best limits for λγ are between -0.00174 and 0.00834.

Future colliders can significantly improve constraints on anomalous couplings.

Abstract

We study the anomalous $W^+W^-\gamma$ couplings in performing the production of the W-pair through the process $e^- p\,\rightarrow\,e^-\gamma^*\gamma^* p\,\rightarrow\,e^-W^+W^-p$ at the Large Hadron electron Collider (LHeC) and the Future Circular Collider-hadron electron (FCC-he). We examine the pure hadronic, the semi-leptonic and the pure leptonic decay channels of the produced W-pair. We assume the center-of-mass energies of $\sqrt{s}=1.30$ and $1.98$ TeV and the integrated luminosities of 10-100 fb$^{-1}$ for the LHeC and the center-of-mass energies of $\sqrt{s}=3.46$ and $5.29$ TeV and the integrated luminosities of 100-2000 fb$^{-1}$ for the FCC-he. The best limits at 95$\%$ confidence level obtained for the anomalous couplings $\Delta\kappa_{\gamma}$ and $\lambda_{\gamma}$ are $\Delta\kappa_{\gamma}=[-0.00208; 0.00206]$ and $\lambda_{\gamma}=[-0.00174; 0.00834]$. By comparing these limits with the experimental limits, we present the potentials of the process and future $ep$ colliders.