Weakly Interacting Stable Pions

TL;DR

This paper explores a new class of stable, weakly interacting pions arising from hidden sector fermions with a discrete symmetry, which could serve as dark matter candidates and have unique collider signatures.

Contribution

It introduces a novel stable pion model in hidden sectors with unbroken discrete symmetry, detailing their properties and potential as dark matter.

Findings

Existence of stable hidden sector pions with calculable masses

Potential collider signatures for dark matter detection

Extension of parity symmetry to fermions in color representations

Abstract

An unbroken discrete symmetry, analogous to G-parity in QCD, exists in standard model extensions with vector-like coupling of electroweak SU(2) to "hidden sector" fermions that are confined by a strong gauge force. For an irreducible SU(2) representation of the hidden sector fermions, the lightest hidden sector states form an isotriplet of "pions" with calculable mass splittings and couplings to standard model fields. The parity can be extended to fermions in real representations of color SU(3), and can provide dark matter candidates with distinct collider signatures.