Discovering neutrino tridents at the Large Hadron Collider

TL;DR

This paper proposes that the LHC's forward neutrino program can measure neutrino trident production, providing a new test of electroweak physics and potential insights into physics beyond the Standard Model.

Contribution

It demonstrates the feasibility of measuring dimuon neutrino tridents at the LHC with high significance and outlines an experimental strategy for detection and background mitigation.

Findings

Predicted >5σ significance for neutrino trident detection at LHC.

Outlined experimental strategies for identifying signals.

Discussed potential constraints on new physics beyond the Standard Model.

Abstract

Neutrino trident production of di-lepton pairs is well recognized as a sensitive probe of both electroweak physics and physics beyond the Standard Model. Although a rare process, it could be significantly boosted by such new physics, and it also allows the electroweak theory to be tested in a new regime. We demonstrate that the forward neutrino physics program at the Large Hadron Collider offers a promising opportunity to measure for the first time, dimuon neutrino tridents with a statistical significance exceeding $5\sigma$. We present predictions for various proposed experiments and outline a specific experimental strategy to identify the signal and mitigate backgrounds, based on "reverse tracking" dimuon pairs in the FASER$\nu$2 detector. We also discuss prospects for constraining beyond Standard Model contributions to neutrino trident rates at high energies.