In:
Journal of High Energy Physics, Springer Science and Business Media LLC, Vol. 2023, No. 7 ( 2023-07-07)
Kurzfassung:
The production cross-sections of Υ mesons, namely Υ(1 S ), Υ(2 S ) and Υ(3 S ), in pp collisions at $$ \sqrt{s} $$ s = 5 TeV are measured with a data sample corresponding to an integrated luminosity of 9 . 13 ± 0 . 18 pb − 1 collected by the LHCb detector. The Υ mesons are reconstructed in the decay mode Υ → μ + μ − . Double differential cross-sections times branching fractions, as functions of the transverse momentum p T and the rapidity y of the Υ mesons, are measured in the range p T 〈 20 GeV/ c and 2 . 0 〈 y 〈 4 . 5. The results integrated over these p T and y ranges are $$ \sigma \left(\textrm{Y}(1S)\right)\times \mathcal{B}\left(\textrm{Y}(1S)\to {\mu}^{+}{\mu}^{-}\right)=2101\pm 33\pm 83\ \textrm{pb}, $$$$ \sigma \left(\textrm{Y}(2S)\right)\times \mathcal{B}\left(\textrm{Y}(2S)\to {\mu}^{+}{\mu}^{-}\right)=526\pm 20\pm 21\ \textrm{pb}, $$$$ \sigma \left(\textrm{Y}(3S)\right)\times \mathcal{B}\left(\textrm{Y}(3S)\to {\mu}^{+}{\mu}^{-}\right)=242\pm 16\pm 10\ \textrm{pb}, $$ σ Υ 1 S × B Υ 1 S → μ + μ − = 2101 ± 33 ± 83 pb , σ Υ 2 S × B Υ 2 S → μ + μ − = 526 ± 20 ± 21 pb , σ Υ 3 S × B Υ 3 S → μ + μ − = 242 ± 16 ± 10 pb , where the first uncertainties are statistical and the second are systematic. The ratios of cross-sections between measurements of two different Υ states and between measurements at different centre-of-mass energies are determined. The nuclear modification factor of Υ(1 S ) at $$ \sqrt{s} $$ s = 5 TeV is updated as well using the directly measured cross-section results from this analysis.
Materialart:
Online-Ressource
ISSN:
1029-8479
DOI:
10.1007/JHEP07(2023)069
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2023
ZDB Id:
2027350-2
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