Observation of Y(1S) Pair Production in Proton-Proton Collisions at √s = 8 TeV
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Khachatryan2017_Article_ObservationOfY1SPairProduction.pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Apyan, Aram
Barbieri, Richard Alexander
Baty, Austin Alan
Bi, Ran
Bierwagen, Katharina
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
May 2017
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
The CMS collaboration, et al. “Observation of Y(1S) Pair Production in Proton-Proton Collisions at √s = 8 TeV.” Journal of High Energy Physics, vol. 2017, no. 5, May 2017. © 2017 The Authors
Version
Final published version
Abstract
Pair production of Y(1S) mesons is observed at the LHC in proton-proton collisions at √s=8 TeV by the CMS experiment in a data sample corresponding to an integrated luminosity of 20.7 fb[superscript −1]. Both Y(1S) candidates are fully reconstructed via their decays to μ[superscript +]μ[superscript −]. The fiducial acceptance region is defined by an absolute Y(1S) rapidity smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that both mesons decay isotropically, is measured to be 68.8±12.7 (stat)±7.4 (syst)±2.8 (ℬ) pb, where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S) decays to μ[superscript +]μ[superscript −]. Assuming instead that the Y(1S) mesons are produced with different polarizations leads to variations in the measured cross section in the range from −38% to +36%. Keywords: Hadron-Hadron scattering (experiments), Quarkonium
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International License
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP05(2017)013
