Measurement of Υ production in pp collisions at sqrt{s} = 5 TeV

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doi:10.1007/jhep07(2023)069

Abstract

The production cross-sections of Υ mesons, namely Υ(1S), Υ(2S) and Υ(3S), in pp collisions at sqrt{s} = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9.13 ± 0.18 pb−1 collected by the LHCb detector. The Υ mesons are reconstructed in the decay mode Υ → μ+μ−. Double differential cross-sections times branching fractions, as functions of the transverse momentum pT and the rapidity y of the Υ mesons, are measured in the range pT< 20 GeV/c and 2.0 < y < 4.5. The results integrated over these pT and y ranges areσΥ1S×BΥ1S→μ+μ−=2101±33±83pb,σΥ2S×BΥ2S→μ+μ−=526±20±21pb,σΥ3S×BΥ3S→μ+μ−=242±16±10pb,\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$ \\sigma \\left(\ extrm{Y}(1S)\\right)\ imes \\mathcal{B}\\left(\ extrm{Y}(1S)\ o {\\mu}^{+}{\\mu}^{-}\\right)=2101\\pm 33\\pm 83\\ \ extrm{pb}, $$$$ \\sigma \\left(\ extrm{Y}(2S)\\right)\ imes \\mathcal{B}\\left(\ extrm{Y}(2S)\ o {\\mu}^{+}{\\mu}^{-}\\right)=526\\pm 20\\pm 21\\ \ extrm{pb}, $$$$ \\sigma \\left(\ extrm{Y}(3S)\\right)\ imes \\mathcal{B}\\left(\ extrm{Y}(3S)\ o {\\mu}^{+}{\\mu}^{-}\\right)=242\\pm 16\\pm 10\\ \ extrm{pb}, $$\\end{document}where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different Υ states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of Υ(1S) at sqrt{s} = 5 TeV is updated as well using the directly measured cross-section results from this analysis.

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