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

TL;DR

This paper reports precise measurements of the production rates of different $mbda$ mesons in proton-proton collisions at 13 TeV, providing data to test quantum chromodynamics models.

Contribution

It presents the first detailed differential cross-section measurements of $mbda$ mesons at 13 TeV, including cross-section ratios with previous 8 TeV data, compared with NRQCD predictions.

Findings

Measured $mbda$ production cross-sections as functions of $p_T$ and $y$.

Determined cross-section ratios between 13 TeV and 8 TeV data.

Compared results with theoretical NRQCD models.

Abstract

The production cross-sections of $\Upsilon(1S)$, $\Upsilon(2S)$ and $\Upsilon(3S)$ mesons in proton-proton collisions at $\sqrt{s}$= 13 TeV are measured with a data sample corresponding to an integrated luminosity of $277 \pm 11$ $\rm pb^{-1}$ recorded by the LHCb experiment in 2015. The $\Upsilon$ mesons are reconstructed in the decay mode $\Upsilon\to\mu^{+}\mu^{-}$. The differential production cross-sections times the dimuon branching fractions are measured as a function of the $\Upsilon$ transverse momentum, $p_{\rm T}$, and rapidity, $y$, over the range $0 < p_{\rm T}< 30$ GeV/c and $2.0 < y < 4.5$. The ratios of the cross-sections with respect to the LHCb measurement at $\sqrt{s}$= 8 TeV are also determined. The measurements are compared with theoretical predictions based on NRQCD.