Confronting dark matter with the diphoton excess from a parent resonance decay Valentina De Romeri, Jong Soo Kim, Víctor Martín-Lozano, Krzysztof Rolbiecki and Roberto Ruiz de Austri Eur. Phys. J. C, 76 5 (2016) 262 Published online: 11 May 2016 DOI: 10.1140/epjc/s10052-016-4116-7