Measurement of J/唯 production in pp collisions at <span class="latex"><span class="ss">symbol">脰s=7span><span class="cs"><span class="math">\sqrt{s}=7span>span>span> TeV
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摘要
The production of J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi mesons in proton–proton collisions at 脰s=7 TeV\sqrt{s}=7\ensuremath {~\mathrm {TeV}} is studied with the LHCb detector at the LHC. The differential cross-section for prompt J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi production is measured as a function of the J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi transverse momentum p<sub>Tsub> and rapidity y in the fiducial region p<sub>Tsub> 脦 [0;14] GeVmu/mu c{\ensuremath{p_{\mathrm{T}}}}\in[0;14]{\ensuremath{~\mathrm{GeV}\mskip-2mu/\mskip-1mu c}} and y∈[2.0;4.5]. The differential cross-section and fraction of J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi from b-hadron decays are also measured in the same p<sub>Tsub> and y ranges. The analysis is based on a data sample corresponding to an integrated luminosity of 5.2 pb−1. The measured cross-sections integrated over the fiducial region are J/y{\ensuremath{J\hspace{-1.5pt}/\hspace{-0.45pt}\psi}} production and J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi from b-hadron decays, where the first uncertainty is statistical and the second systematic. The prompt J/y{\ensuremath{J\hspace{-1.5pt}/\hspace{-0.45pt}\psi}} production cross-section is obtained assuming no J/yJ\hspace{-1.5pt}/\hspace{-0.45pt}\psi polarisation and the third error indicates the acceptance uncertainty due to this assumption.

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