Invisible jets from composite neutrinos

TL;DR

This paper introduces a new experimental method to detect neutrino interactions with a composite sterile sector via invisible jets, predicting energy-dependent signatures that can be tested with current and future neutrino experiments.

Contribution

It proposes a novel probe of neutrino couplings to a composite sterile sector using invisible jets, with detailed calculations and bounds from existing data and future experiment sensitivities.

Findings

Invisible jet production enhances neutral-to-charged current ratio at high energies.

Current NuTeV data set new bounds on composite neutrino models.

Future experiments like SHiP and FPF could surpass existing constraints.

Abstract

We propose a novel experimental probe of neutrino couplings to a composite sterile sector, leveraging the unique signature of neutrino disintegration into "invisible jets" in high-energy neutrino scattering. Focusing on scenarios where the invisible jet invariant mass significantly exceeds the confinement scale, we compute production rates within the conformal window. In this regime, invisible jet production leads to an energy-dependent enhancement of the neutral-to-charged current ratio in neutrino-nucleus scattering. Using NuTeV measurements, we derive new bounds and assess the sensitivity of upcoming experiments such as SHiP and the Forward Physics Facility at CERN. We sketch models where these probes surpass constraints from electroweak gauge boson and Higgs invisible branching ratios. In contrast, neutrino-electron scattering modifications are suppressed by the lower center-of-mass energy and are unlikely to be observable at DUNE.