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Observation of Y(1S) Pair Production in Proton-Proton Collisions at √s = 8 TeV

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; Demiragli, Zeynep; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Krajczar, Krisztian F.; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Luckey Jr, P David; Maier, Benedikt; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Niu, Xinmei; Paus, Christoph M. E.; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Varma, Mukund Madhav; Velicanu, Dragos Alexandru; Veverka, Jan; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Mingming; Wyslouch, Victoria; ... Show more Show less
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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
Date issued
2017-05
URI
http://hdl.handle.net/1721.1/119227
Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science
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
ISSN
1029-8479

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