Measurement of the production cross section ratio σ ([subscript χb2](1P))/σ ([subscript χb1](1P)) in pp collisions at √s = 8 TeV
Author(s)
Apyan, Aram; Barbieri, Richard Alexander; Busza, Wit; Cali, Ivan Amos; Di Matteo, Leonardo; Dutta, Valentina; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Gulhan, Doga Can; Klute, Markus; Lai, Yue Shi; Lee, Yen-Jie; Levin, Andrew Michael; Ma, Teng; Paus, Christoph M. E.; Ralph, Duncan Kelley; Stephans, George S. F.; Velicanu, Dragos Alexandru; Veverka, Jan; Wyslouch, Boleslaw; Yang, Mingming; Zanetti, Marco; Wyslouch, Victoria; Bauer, Gerry P; Chan, M.; Luckey Jr, P David; Roland, Christof E; Roland, Gunther M; Stoeckli, Fabian; Sumorok, Konstanty C; ... Show more Show less
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A measurement of the production cross section ratio σ([subscript χb2](1P))/σ([subscript χb1](1P)) is presented. The [subscript χb1](1P) and [subscript χb2](1P) bottomonium states, promptly produced in pp collisions at √s = 8 TeV, are detected by the CMS experiment at the CERN LHC through their radiative decays [subscript χb1,2](1P) → ϒ(1S) + γ. The emitted photons are measured through their conversion to e[superscript +]e[superscript −] pairs, whose reconstruction allows the two states to be resolved. The ϒ(1S) is measured through its decay to two muons. An event sample corresponding to an integrated luminosity of 20.7 fb[superscript −1] is used to measure the cross section ratio in a phase-space region defined by the photon pseudorapidity, |η[superscript γ]| < 1.0; the ϒ(1S) rapidity, |y[superscript ϒ]| < 1.5; and the ϒ(1S) transverse momentum, 7 < p[ϒ over T] < 40 GeV. The cross section ratio shows no significant dependence on the ϒ(1S) transverse momentum, with a measured average value of 0.85 ± 0.07 (stat + syst) ± 0.08 (BF), where the first uncertainty is the combination of the experimental statistical and systematic uncertainties and the second is from the uncertainty in the ratio of the [subscript χb] branching fractions.
Date issued
2015-02Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science; Massachusetts Institute of Technology. School of ScienceJournal
Physics Letters B
Publisher
Elsevier
Citation
Khachatryan, V., et al. “Measurement of the Production Cross Section Ratio σ ([subscript χb2](1P))/σ ([subscript χb1](1P)) in pp collisions at √s = 8 TeV.” Physics Letters B 743 (April 2015): 383–402. © 2015 CERN for the benefit of the CMS Collaboration
Version: Final published version
ISSN
03702693