Observation of the χ[subscript b1](3P) and χ[subscript b2](3P) and Measurement of their Masses
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; Demiragli, Zeynep; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Harris, Philip Coleman; Hsu, Dylan George; Hu, Miao; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Lee, Yen-Jie; 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, Gunther M; Roland, Christof E; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Velicanu, Dragos Alexandru; Wang, J.; Wang, Ta-Wei; Wyslouch, Boleslaw; ... Show more Show less
DownloadPhysRevLett.121.092002.pdf (480.6Kb)
PUBLISHER_CC
Publisher with Creative Commons License
Creative Commons Attribution
Terms of use
Metadata
Show full item recordAbstract
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.
Date issued
2018-08Department
Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear ScienceJournal
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
ISSN
0031-9007
1079-7114