Projected Sensivity to Dimension-6 Triple Gauge Couplings at the FCC-hh

TL;DR

This paper evaluates the sensitivity of the FCC-hh collider at 100 TeV to anomalous dimension-6 triple gauge couplings in W gamma production, considering realistic detector effects and systematic uncertainties.

Contribution

It provides the first detailed sensitivity analysis of dimension-6 anomalous $WW\gamma$ couplings at the FCC-hh with realistic detector and systematic effects included.

Findings

Sensitivity to CP-conserving couplings is around 0.01 TeV$^{-2}$.

Sensitivity to CP-violating couplings is around 0.03 TeV$^{-2}$.

Systematic uncertainties reduce the sensitivity reach.

Abstract

In this study, we investigate the process $pp \rightarrow W^{\pm} \gamma$ for the physics potential of the FCC-hh with $\sqrt{s}=100$ TeV to examine the anomalous $WW\gamma$ couplings defined by three CP-conserving and two CP-violating effective operators of dimension-6. The analysis containing the realistic detector effects is carried out in the mode where $W^{\pm}$ bosons in the final state decay into the leptonic channel. The best sensitivities obtained from the process $pp \rightarrow W^{\pm} \gamma$ on the anomalous couplings $C_{WWW}/ \Lambda^{2}$ and $C_{W,B}/ \Lambda^{2}$ determined by CP-conserving effective Lagrangians are $[-0.01; 0.01]$ TeV$^{-2}$ and $[-0.88; 0.88]$ TeV$^{-2}$, while $C_{\tilde{W}WW}/ \Lambda^{2}$ and $C_{\tilde{W}}/ \Lambda^{2}$ couplings defined by CP-violating effective Lagrangian are obtained as $[-0.03; 0.03]$ TeV$^{-2}$ and $[-0.47; 0.47]$ TeV$^{-2}$ at the FCC-hh with $\sqrt{s}=100$ TeV, $L_{int}=30$ ab$^{-1}$. However, if the systematic uncertainty is included, we obtain reduced sensitivities on the anomalous $WW\gamma$ coupling . The results are compared for assumed systematics of $5\%$ and $10\%$.