Observation of the χ[subscript b1](3P) and χ[subscript b2](3P) and Measurement of their Masses
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PhysRevLett.121.092002.pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
D'Alfonso, Mariarosaria
Date Issued
August 2018
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Sirunyan, A. M., et al. “Observation of the χ[subscript b1](3P) and χ[subscript b2](3P) and Measurement of Their Masses.” Physical Review Letters, vol. 121, no. 9, Aug. 2018. © 2018 CERN, for the CMS Collaboration
Version
Final published version
Abstract
he χ[subscript b1](3P) and χ[subscript b2](3P) states are observed through their (3S)[subscript γ] decays, using an event sample of proton-proton collisions collected by the CMS experiment at the CERN LHC. The data were collected at a center-of-mass energy of 13 TeV and correspond to an integrated luminosity of 80.0 fb[superscript -1]. The (3S) mesons are identified through their dimuon decay channel, while the low-energy photons are detected after converting to e[superscript +]e[superscript -] pairs in the silicon tracker, leading to a χ[subscript b](3P) mass resolution of 2.2 MeV. This is the first time that the J=1 and 2 states are well resolved and their masses individually measured: 10513.42±0.41(stat)±0.18(syst) MeV and 10524.02±0.57(stat)±0.18(syst) MeV; they are determined with respect to the world-average value of the ~(3S) mass, which has an uncertainty of 0.5 MeV. The mass splitting is measured to be 10.60±0.64(stat)±0.17(syst) MeV.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1103/PhysRevLett.121.092002
