CMS-PAS-BPH-24-004

CMS-PAS-BPH-24-004
Measurement of the $ \Upsilon $(1S), $ \Upsilon $(2S), and $ \Upsilon $(3S) differential cross sections in pp collisions at $ \sqrt{s}= $ 13.6 TeV
CMS Collaboration
2025-11-16

Abstract: The production cross sections of the $ \Upsilon $(1S), $ \Upsilon $(2S), and $ \Upsilon $(3S) mesons are measured in proton-proton collisions at $ \sqrt{s}= $ 13.6 TeV, using a data sample collected in 2022 by the CMS experiment and corresponding to an integrated luminosity of 37.4 fb$^{-1} $. The measurement is performed in the dimuon decay channels, differentially as a function of transverse momentum in the 20-200 GeV range, in the $ \|y\| < $ 0.6 and 0.6 $ < \|y\| < $ 1.2 rapidity intervals.
Links: CDS record (PDF) ; CADI line (restricted) ;

Figures	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Invariant mass distribution of the dimuons measured with 20 $ < p_{\mathrm{T}} < $ 22 GeV and $ \|y\| < $ 0.6. The result of the fit is represented by the solid coloured lines (signal peaks), the dashed gray line (background), and the solid black line (total).
png pdf	Figure 2: Measured $ p_{\mathrm{T}} $-differential $ \Upsilon $(1S) (red), $ \Upsilon $(2S) (green), and $ \Upsilon $(3S) (blue) cross sections times the $ \mu^{+}\mu^{-} $ decay branching fractions, per rapidity unit, in the 0-0.6 (filled circles) and 0.6-1.2 (open squares) $ \|y\| $ ranges. For visibility, the $ \Upsilon $(1S) and $ \Upsilon $(2S) values are scaled by factors of 100 and 10, respectively. The error bars represent the total uncertainties. The middle and lower panels show the ratios between this measurement, made at $ \sqrt{s} = $ 13.6 TeV, and previous measurements, made at 7 and 13 TeV [18,17], treating all uncertainties as uncorrelated.
png pdf	Figure 3: Ratios between the $ p_{\mathrm{T}} $-differential cross sections times the $ \mu^{+}\mu^{-} $ decay branching fractions: $ \Upsilon $(2S) over $ \Upsilon $(1S) (green) and $ \Upsilon $(3S) over $ \Upsilon $(1S) (blue), in the 0-0.6 (closed circles) and 0.6-1.2 (open squares) $ \|y\| $ ranges. The error bars represent the total uncertainties.
png pdf	Figure 4: Comparison between the measured differential cross sections and curves computed in the NRQCD framework, with one particular set of LDMEs [37].

Summary

The $ p_{\mathrm{T}} $-differential cross sections of the $ \Upsilon $(1S), $ \Upsilon $(2S), and $ \Upsilon $(3S) bottomonium states, times the branching fractions of their dimuon decays, have been measured in a broad $ p_{\mathrm{T}} $ range, from 20 to 200 GeV, in two equidistant absolute rapidity bins in the $ |y| < $ 1.2 range. The analysis was made on the basis of an event sample of pp collisions at $ \sqrt{s} = $ 13.6 TeV, collected by CMS in 2022 and corresponding to an integrated luminosity of 37.4 fb$ ^{-1} $. These results will significantly contribute to global fits of quarkonium cross sections and polarizations performed to extract the long-distance matrix elements that determine inclusive quarkonium production in the NRQCD framework.

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