Angular moments of the decay \u039bb0\u2009\u2192\u2009\u039b\u03bc+\u03bc\u2212 at low hadronic recoil

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doi:10.1007/jhep09(2018)146

Abstract

An analysis of the angular distribution of the decay Λb0 → Λμ+μ− is presented, using data collected with the LHCb detector between 2011 and 2016 and corresponding to an integrated luminosity of approximately 5 fb−1. Angular observables are determined using a moment analysis of the angular distribution at low hadronic recoil, corresponding to the dimuon invariant mass squared range 15 < q2 < 20 GeV2/c4. The full basis of observables is measured for the first time. The lepton-side, hadron-side and combined forward-backward asymmetries of the decay are determined to beAFBℓ=−0.39±0.04stat±0.01syst,AFBh=−0.30±0.05stat±0.02syst,AFBℓh=+0.25±0.04stat±0.01syst.\\documentclass[12pt]{minimal}\t\t\t\t\\usepackage{amsmath}\t\t\t\t\\usepackage{wasysym}\t\t\t\t\\usepackage{amsfonts}\t\t\t\t\\usepackage{amssymb}\t\t\t\t\\usepackage{amsbsy}\t\t\t\t\\usepackage{mathrsfs}\t\t\t\t\\usepackage{upgreek}\t\t\t\t\\setlength{\\oddsidemargin}{-69pt}\t\t\t\t\\begin{document}$$ \\begin{array}{l}{A}_{\\mathrm{FB}}^{\\ell }=-0.39\\pm 0.04\\left(\\mathrm{stat}\\right)\\pm 0.01\\left(\\mathrm{syst}\\right),\\hfill \\\\ {}{A}_{\\mathrm{FB}}^h=-0.30\\pm 0.05\\left(\\mathrm{stat}\\right)\\pm 0.02\\left(\\mathrm{syst}\\right),\\hfill \\\\ {}{A}_{\\mathrm{FB}}^{\\ell h}=+0.25\\pm 0.04\\left(\\mathrm{stat}\\right)\\pm 0.01\\left(\\mathrm{syst}\\right).\\hfill \\end{array} $$\\end{document}The measurements are consistent with Standard Model predictions.

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