Dark Gauge U(1) symmetry for an alternative left–right model Corey Kownacki, Ernest Ma, Nicholas Pollard, Oleg Popov and Mohammadreza Zakeri Eur. Phys. J. C, 78 2 (2018) 148 Published online: 20 February 2018 DOI: 10.1140/epjc/s10052-018-5630-6