Phenomenology of an extended Higgs portal inflation model after Planck 2013 Fa Peng Huang, Chong Sheng Li, Ding Yu Shao and Jian Wang Eur. Phys. J. C, 74 8 (2014) 2990 Published online: 07 August 2014 DOI: 10.1140/epjc/s10052-014-2990-4