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

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 7 TeV recorded by the ATLAS experiment at the LHC. The measurement exploits the $ψ(2S)\to J/ψ(\toμ^+μ^-)π^+π^-$ decay mode, and probes $ψ(2S)$ mesons with transverse momenta in the range $10\leq p_T<100$ 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.