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URN: urn:nbn:de:swb:90-702553

Observation of Y(1S) pair production in proton-proton collisions at √s=8 TeV

CMS Collaboration; Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, M.; Friedl, M.; Frühwirth, R.; Ghete, V. M.; Hartl, C.; Hörmann, N.; Hrubec, J.; Jeitler, M.; König, A.; Krätschmer, I.; ... mehr

Abstract:
Pair production of Y(1S) mesons is observed at the LHC in proton-proton
collisions at √s = 8TeV by the CMS experiment in a data sample corresponding to an
integrated luminosity of 20.7 fb$^{-1}$1. Both Y(1S) candidates are fully reconstructed via their
decays to μ$^{+}$μ$^{-}$. The fiducial acceptance region is defined by an absolute Y(1S) rapidity
smaller than 2.0. The fiducial cross section for the production of Y(1S) pairs, assuming that
both mesons decay isotropically, is measured to be 68:8$\pm$12:7 (stat)$\pm$7:4 (syst)$\pm$2:8 (B) pb,
where the third uncertainty comes from the uncertainty in the branching fraction of Y(1S)
decays to μ$^{+}$μ$^{-}$. 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%.


Zugehörige Institution(en) am KIT Institut für Experimentelle Kernphysik (IEKP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 1029-8479, 1126-6708
URN: urn:nbn:de:swb:90-702553
KITopen ID: 1000070255
Erschienen in Journal of high energy physics
Band 2017
Heft 5
Seiten 13
Schlagworte Hadron-Hadron scattering (experiments), Quarkonium
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