Measurement of quarkonium production cross sections in pp collisions at $\sqrt{s}=$ 13 TeV

TL;DR

This paper reports precise measurements of the production rates of various quarkonium states in proton-proton collisions at 13 TeV, providing valuable data to test quantum chromodynamics models.

Contribution

First detailed differential cross sections of multiple quarkonium states measured at 13 TeV with comparison to theoretical predictions.

Findings

Measured cross sections as functions of rapidity and transverse momentum.

Presented ratios of different quarkonium production cross sections.

Compared experimental results with theoretical models.

Abstract

Differential production cross sections of J/$\psi$ and $\psi$(2S) charmonium and $\Upsilon$(nS) (n = 1, 2, 3) bottomonium states are measured in proton-proton collisions at $\sqrt{s} =$ 13 TeV, with data collected by the CMS detector at the LHC, corresponding to an integrated luminosity of 2.3 fb$^{-1}$ for the J/$\psi$ and 2.7 fb$^{-1}$ for the other mesons. The five quarkonium states are reconstructed in the dimuon decay channel, for dimuon rapidity $|y| <$ 1.2. The double-differential cross sections for each state are measured as a function of $y$ and transverse momentum, and compared to theoretical expectations. In addition, ratios are presented of cross sections for prompt $\psi$(2S) to J/$\psi$, $\Upsilon$(2S) to $\Upsilon$(1S), and $\Upsilon$(3S) to $\Upsilon$(1S) production.