{"paper":{"title":"NNLO QCD corrections to the polarized top quark decay $t(\\uparrow) \\to X_b+W^+$","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"hep-ph","authors_text":"A. Czarnecki, J.G. K\\\"orner, J.H. Piclum, S. Groote","submitted_at":"2018-03-09T19:09:13Z","abstract_excerpt":"We compute the next-to-next-to-leading order (NNLO) QCD corrections to the decay $t(\\uparrow) \\to X_b +W^+$ of a polarized top quark. The spin-momentum correlation in this quasi two-body decay is described by the polar angle distribution $\\mathrm{d}\\Gamma/\\mathrm{d}\\cos\\theta_P=\\frac{\\Gamma}{2}(1+P_t\\, \\alpha_P\\, \\cos\\theta_P)$ where $P_t$ is the polarization of the top quark and $\\alpha_P$ denotes the asymmetry parameter of the decay. For the latter we find $\\alpha^{\\mathrm{NNLO}}_P=0.3792\\pm 0.0037$."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1803.03658","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"}