We map the distribution of unpolarized quarks inside a unpolarized pion as a function of the quark's transverse momentum, encoded in unpolarized Transverse Momentum Distributions (TMDs). We extract the pion TMDs from available data of unpolarized pion-nucleus Drell-Yan processes, where the cross section is differential in the lepton-pair transverse momentum. In the cross section, pion TMDs are convoluted with nucleon TMDs that we consistently take from our previous studies. We obtain a fairly good agreement with data. We present also predictions for pion-nucleus scattering that is being measured by the COMPASS Collaboration.
@article{arxiv.2210.01733,
title = {Extraction of Pion Transverse Momentum Distributions from Drell-Yan data},
author = {Matteo Cerutti and Lorenzo Rossi and Simone Venturini and Alessandro Bacchetta and Valerio Bertone and Chiara Bissolotti and Marco Radici},
journal= {arXiv preprint arXiv:2210.01733},
year = {2023}
}