2026/07/22 by Matthew J. Baldwin, Keisuke Harigaya, Isaac R. Wang
#hep-ph
Parity symmetry, with an extended gauge group SU(3)c × SU(2)L × SU(2)R × U(1)X, can solve the strong CP problem. In particular, the model where SU(2)R× U(1)X is broken by the Parity partner of the Standard Model Higgs solves the strong CP problem without the necessity of introducing extra symmetry. We discuss the possibility of accidentally stable dark matter in this framework and show that SU(2)L × SU(2)R bi-triplet fermions can be stable over cosmological timescales. We compute the relic abundance of the bi-triplet dark matter and derive constraints on the parameter space from collider, direct-detection, and indirect-detection experiments. The SU(2)R× U(1)X symmetry breaking scale is required to be below 150 TeV, and most of the parameter space can be probed by near-future indirect-detection experiments.