Mass-degenerate Higgs bosons near 125 GeV in the NMSSM under current experimental constraints Liangliang Shang, Pengqiang Sun, Zhaoxia Heng, Yangle He and Bingfang Yang Eur. Phys. J. C, 80 6 (2020) 574 Published online: 26 June 2020 DOI: 10.1140/epjc/s10052-020-8132-2