Probe of the Anomalous Quartic Couplings with Beam Polarization at the CLIC

TL;DR

This study investigates the sensitivity of the CLIC collider to anomalous quartic gauge couplings using beam polarization, providing improved bounds on these couplings in the context of high-energy electron-positron collisions.

Contribution

The paper presents new bounds on anomalous quartic couplings at the CLIC, considering beam polarization and various energies, enhancing the current limits in this area.

Findings

Best sensitivities at 3 TeV with 2000 fb$^{-1}$ luminosity.

Beam polarization improves the bounds on anomalous couplings.

Provides 95% confidence level bounds that surpass existing limits.

Abstract

We have investigated the anomalous quartic couplings defined by the dimension-8 operators in semileptonic decay channel of the $e^{+}e^{-}\rightarrow \nu_{e} W^{-} W^{+} \bar{\nu}_{e}$ process for unpolarized and polarized electron (positron) beam at the Compact Linear Collider. We give the $95\%$ confidence level bounds on anomalous $\frac{f_{S0}}{\Lambda^{4}}$, $\frac{f_{S1}}{\Lambda^{4}}$ and $\frac{f_{T0}}{\Lambda^{4}}$ couplings for various values of the integrated luminosities and center-of-mass energies. The best sensitivities obtained on anomalous $\frac{f_{S0}}{\Lambda^{4}}$, $\frac{f_{S1}}{\Lambda^{4}}$ and $\frac{f_{T0}}{\Lambda^{4}}$ couplings through the process $e^{+}e^{-}\rightarrow \nu_{e} W^{-} W^{+} \bar{\nu}_{e}$ with beam polarization at $\sqrt{s}=3$ TeV and an integrated luminosity of $L_{int}=2000$ fb$^{-1}$ are $[-4.05;\, 3.67]\times 10^{-12}$ GeV$^{-4}$, $[-3.08; \, 2.12]\times 10^{-12}$ GeV$^{-4}$, $[-1.98; \, 0.64]\times 10^{-13}$ GeV$^{-4}$, which show improvement over the current bounds.