Search for the electromagnetic properties of the neutrinos at the HL-LHC and the FCC-hh

TL;DR

This paper investigates the potential to constrain neutrino electromagnetic properties, specifically the $ uar{ u}\gamma\gamma$ couplings, at future high-energy colliders using effective field theory and detailed simulation of signal and background processes.

Contribution

It introduces a novel analysis framework for probing neutrino electromagnetic couplings at HL-LHC and FCC-hh using EFT and advanced simulation tools, improving upon previous experimental limits.

Findings

Constraints on $ uar{ u}\gamma\gamma$ couplings are significantly improved.

The analysis demonstrates the feasibility of detecting neutrino electromagnetic interactions at future colliders.

Simulation results show enhanced sensitivity compared to LEP bounds.

Abstract

The $\nu\bar{\nu}\gamma \gamma$ couplings parametrized with the non-standard dimension-seven operators defined by the Effective Field Theory framework are investigated through the process $pp\to \nu\bar{\nu}\gamma$ at the High Luminosity-LHC and the Future Circular proton-proton Collider. The effective Lagrangian of $\nu\bar{\nu}\gamma \gamma$ couplings is implemented into FeynRules to generate a UFO module inserted into Madgraph to generate both background and signal events. These events are then passed through Pythia 8 for parton showering and Delphes to include realistic detector effects. The sensitivities on $\nu\bar{\nu}\gamma \gamma$ couplings are obtained at $95\%$ confidence level. We show that the analysis of the signal emerging from the process $pp\to \nu\bar{\nu}\gamma$ allows to improve constraints on $\nu\bar{\nu}\gamma \gamma$ couplings given by the LEP collaboration.