Review of Particle Physics. - Group, Particle Data; Zyla, P A; Barnett, R M; Beringer, J; Dahl, O; Dwyer, D A; Groom, D E; Lin, C -J; Lugovsky, K S; Pianori, E; Robinson, D J; Wohl, C G; et al. (Progress of Theoretical & Experimental Physics: PTEP, 2020)