Measurement of the exclusive Υ production cross-section in pp collisions at √s 7 TeV and 8 TeV
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JHEP09(2015)084.pdf
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Author(s)
Ilten, Philip J
Williams, Michael
Date Issued
September 2015
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
The LHCb collaboration, et al. “Measurement of the Exclusive Υ Production Cross-Section in Pp Collisions at √s =7 TeV and 8 TeV.” Journal of High Energy Physics, vol. 2015, no. 9, Sept. 2015. © 2015 The Authors
Version
Final published version
Abstract
A study is presented of central exclusive production of Υ(nS) states, where the Υ(nS) resonances decay to the μ[superscript +] μ[superscript −] final state, using pp collision data recorded by the LHCb experiment. The cross-section is measured in the rapidity range 2 < y(Υ) < 4.5 where the muons are reconstructed in the pseudorapidity range 2 < η(μ[superscript ±]) < 4.5. The data sample corresponds to an integrated luminosity of 2.9 fb[superscript −1] and was collected at centre-of-mass energies of 7 TeV and 8 TeV. The measured Υ(1S) and Υ(2S) production cross-sections are σ(pp→pY(1S)p) = 9.0±2.1±1.7 pb and σ(pp→pY(2S)p) = 1.3±0.8±0.3 pb, where the first uncertainties are statistical and the second are systematic. The Υ(1S) crosssection is also measured as a function of rapidity and is found to be in good agreement with Standard Model predictions. An upper limit is set at 3.4 pb at the 95% confidence level for the exclusive Υ(3S) production cross-section, including possible contamination from χ b (3P) → Υ(3S)γ decays. Keywords: Diffraction, Hadron-Hadron Scattering, Forward physics, Particle and resonance production, Heavy quark production
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1007/JHEP09(2015)084
