Measurement of the production cross-section of $\psi (2S)\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\pi }^{+}{\pi }^{-}$ in $pp$ collisions at $\sqrt{s}=7$ TeV at ATLAS

Abstract

The prompt and non-prompt production cross-sections for $\psi (2S)$ mesons are measured using 2.1 fb${}^{-1}$ of $pp$ collision data at a centre-of-mass energy of 7 TeV recorded by the ATLAS experiment at the LHC. The measurement exploits the $\psi (2S)\to J/\psi (\to {\mu }^{+}{\mu }^{-}){\pi }^{+}{\pi }^{-}$ decay mode, and probes $\psi (2S)$ mesons with transverse momenta in the range $10\le p_T<100$ GeV and rapidity $|y|<2.0$. The results are compared to other measurements of $\psi (2S)$ production at the LHC and to various theoretical models for prompt and non-prompt quarkonium production.

arXiv comment35 pages plus author list + cover pages (58 pages total), 14 figures, 8 tables, submitted to JHEP, All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2013-06/

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• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
• NRQCD colour-octet expansion vs LHC quarkonium production: signs of a hierarchy puzzle?
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