We report a study of the determination of the intrinsic transverse momentum of partons, the intrinsic kT, from the dilepton transverse momentum pT in Drell-Yan (DY) production at hadron colliders. The result shows that a good sensitivity to the intrinsic kT distribution is achieved by measuring relative ratios between the cross sections of suitably defined low-pT and high-pT regions. The study is performed through both a pseudo-data test and an extraction from measurements of the DY process by the CMS collaboration. Since the methodology does not rely on any dedicated partition of bins, this pT-ratio observable requires less special treatment in very low pT regions, and propagates lower systematic uncertainties induced from unfolding or momentum migration, in contrast with previous proposals of using a fine-binning measurement of the differential cross section.
@article{arxiv.2412.19060,
title = {Coarse-grained binning in Drell-Yan transverse momentum spectra},
author = {Wenxiao Zhan and Siqi Yang and Minghui Liu and Francesco Hautmann and Liang Han},
journal= {arXiv preprint arXiv:2412.19060},
year = {2025}
}