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The prompt and non-prompt production cross-sections for ψ (2S) mesons are measured using 2.1 fb−1 of pp collision data at a centre-of-mass energy of 7TeV recorded by the ATLAS experiment at the LHC. The measurement exploits the ψ (2S) → J/ψ (→ μ+μ−)π+π− decay mode, and probes ψ (2S) mesons with transverse momenta in the range 10 ≤ pT < 100 GeV and rapidity |y| < 2.0. The results are compared to other measurements of ψ (2S) production at the LHC and to various theoretical models for prompt and non-prompt quarkonium production.
Aad, G., Abbott, B., Abdallah, J., Abdelkhalek, S., Abdinov, O., Aben, R., … Garberson, F. (2014). Measurement of the production cross-section of ψ(2S) →J/ψ (→ μ+μ−)π+ π− in pp collisions at √s = 7 TeV at ATLAS. Journal of High Energy Physics, 2014(9). https://doi.org/10.1007/JHEP09(2014)079