{"paper":{"title":"Precise Calculation of the Dilepton Invariant-Mass Spectrum and the Decay Rate in $B^\\pm \\to \\pi^\\pm \\mu^+ \\mu^-$ in the SM","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["hep-ex","hep-lat"],"primary_cat":"hep-ph","authors_text":"Ahmed Ali (DESY), Aleksey V. Rusov (Yaroslavl State U.), Alexander Ya. Parkhomenko (Yaroslavl State U.)","submitted_at":"2013-12-09T17:38:23Z","abstract_excerpt":"We present a precise calculation of the dilepton invariant-mass spectrum and the decay rate for $B^\\pm \\to \\pi^\\pm \\ell^+ \\ell^-$ ($\\ell^\\pm = e^\\pm, \\mu^\\pm $) in the Standard Model (SM) based on the effective Hamiltonian approach for the $b \\to d \\ell^+ \\ell^-$ transitions. With the Wilson coefficients already known in the next-to-next-to-leading logarithmic (NNLL) accuracy, the remaining theoretical uncertainty in the short-distance contribution resides in the form factors $f_+ (q^2)$, $f_0 (q^2)$ and $f_T (q^2)$. Of these, $f_+ (q^2)$ is well measured in the charged-current semileptonic de"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1312.2523","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"}