On the critical end point in a two-flavor linear sigma model coupled to quarks Alejandro Ayala, L. A. Hernández, M. Loewe, Juan Cristobal Rojas and R. Zamora Eur. Phys. J. A, 56 2 (2020) 71 Published online: 27 February 2020 DOI: 10.1140/epja/s10050-020-00086-z