{"paper":{"title":"Boer-Mulders function of pion meson and $q_T$-weighted $\\cos2\\phi$ asymmetry in the unpolarized $\\pi^- p$ Drell-Yan at COMPASS","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex"],"primary_cat":"hep-ph","authors_text":"Xiaoyu Wang, Zhengxian Wang, Zhun Lu","submitted_at":"2017-02-13T05:38:53Z","abstract_excerpt":"We calculate the two leading-twist transverse momentum dependent distribution functions of the pion meson, the unpolarized distribution $f_{1\\pi}(x,\\bm{k}^2_T)$ and the Boer-Mulders function $h_{1\\pi}^\\perp (x,\\bm{k}^2_T)$, using the pion wave functions derived from a light-cone approach. The evolution effect of the first $\\bm k_T$-moment of the pion Boer-Mulders function is studied by employing an approximate evolution kernel. Using the model resulting distributions, we predict the transverse momentum weighted $\\cos2\\phi$ azimuthal asymmetry in the unpolarized $\\pi^- p$ Drell-Yan process whic"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1702.03637","kind":"arxiv","version":2},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"}