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

TL;DR

This paper reports measurements of prompt and non-prompt $ ext{psi}(2S)$ production cross-sections in proton-proton collisions at 7 TeV using ATLAS data, comparing results with theoretical models and previous measurements.

Contribution

First measurement of $ ext{psi}(2S)$ production cross-sections at 7 TeV in the specified kinematic range using the decay mode $ ext{psi}(2S) o J/ ext{psi}( o ext{mu}^+ ext{mu}^-) ext{pi}^+ ext{pi}^-$ at ATLAS.

Findings

Measured cross-sections for prompt and non-prompt $ ext{psi}(2S)$ production.

Results are consistent with some theoretical models and previous measurements.

Provides data for understanding quarkonium production mechanisms.

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 $10\leq p_T<100$ 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.