Pion nucleus Drell-Yan process and parton transverse momentum in the pion

Understand

We present a thorough analysis of unpolarized Drell-Yan (DY) pair production in pion-nucleus scattering.

• On the nucleus side, we use nuclear parton distributions along with parametrisations of the nucleon partonic transverse distribution available in the literature.
• Partonic longitudinal and transverse distributions of the pion are those obtained in a recent calculation in a Nambu-Jona Lasinio (NJL) framework, with Pauli-Villars regularization.
• The scale of the NJL model is fixed by a comparison between NLO predictions based on NJL evolved pion distributions and rapidity differential DY cross sections data.