Sivers and Boer–Mulders GTMDs in light-front holographic quark–diquark model Dipankar Chakrabarti, Narinder Kumar, Tanmay Maji and Asmita Mukherjee Eur. Phys. J. Plus, 135 6 (2020) 496 Published online: 15 June 2020 DOI: 10.1140/epjp/s13360-020-00470-0