Cross-Section Measurement of $\psi(2\mathrm{S})\rightarrow J/\psi(\rightarrow\mu^+\mu^-)\pi^+\pi^-$ in 7 TeV $pp$ collisions at ATLAS

The prompt and non-prompt production cross-sections for $\psi(2\mathrm{S})$ 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 studies the $\psi(2\mathrm{S})\rightarrow J/\psi(\to\mu^+\mu^-)\pi^+\pi^-$ decay mode, and probes $\psi(2\mathrm{S})$ with transverse momenta in the range $p_{T}=10-100$~GeV and rapidity $|y|<2.0$. The results are compared to existing LHC $\psi(2\mathrm{S})$ production measurements and theoretical models for prompt and non-prompt production.