Anomaly driven signatures of new invisible physics at the Large Hadron Collider

TL;DR

This paper explores how anomaly cancellations in extensions of the Standard Model with heavy, invisible fermions can produce detectable signatures at the LHC, revealing new physics despite the fermions being too heavy to produce directly.

Contribution

It demonstrates that anomaly cancellation conditions can lead to observable gauge boson signatures at the LHC, even when new fermions are too heavy to be directly detected.

Findings

Anomaly cancellation can produce observable effects in gauge boson interactions.

Invisible heavy fermions can leave detectable signatures at the LHC.

The study provides a new way to search for physics beyond the Standard Model.

Abstract

Many extensions of the Standard Model (SM) predict new neutral vector bosons at energies accessible by the Large Hadron Collider (LHC). We study an extension of the SM with new chiral fermions subject to non-trivial anomaly cancellations. If the new fermions have SM charges, but are too heavy to be created at LHC, and the SM fermions are not charged under the extra gauge field, one would expect that this new sector remains completely invisible at LHC. We show, however, that a non-trivial anomaly cancellation between the new heavy fermions may give rise to observable effects in the gauge boson sector that can be seen at the LHC and distinguished from backgrounds.