Probing the two-scale-factor universality hypothesis by exact rotation symmetry-breaking mechanism J. F. S. Neto, K. A. L. Lima, P. R. S. Carvalho and M. I. Sena-Junior Eur. Phys. J. C, 77 12 (2017) 839 Published online: 07 December 2017 DOI: 10.1140/epjc/s10052-017-5427-z