Pion nucleus Drell–Yan process and parton transverse momentum in the pion Federico Alberto Ceccopieri, Aurore Courtoy, Santiago Noguera and Sergio Scopetta Eur. Phys. J. C, 78 8 (2018) 644 Published online: 12 August 2018 DOI: 10.1140/epjc/s10052-018-6115-3