Study of the lineshape of the χ c 1 ( 3872 ) state
Name
PhysRevD.102.092005.pdf
Description
Published version
Size
2.27 MB
Format
Unknown
Checksum (MD5)
2e7b93b101454b33403abf25953f2731
Author(s)
Boettcher, Thomas Julian
Craik, Daniel C
Kitouni, Ouail
Weisser, Constantin
Williams, Michael
Date Issued
2020
Journal
Physical Review D
Publisher
American Physical Society (APS)
Citation
Williams, Michael. 2020. "Study of the lineshape of the χ c 1 ( 3872 ) state." Physical Review D, 102 (9).
Version
Final published version
Abstract
© 2020 CERN. A study of the lineshape of the χc1(3872) state is made using a data sample corresponding to an integrated luminosity of 3 fb-1 collected in pp collisions at center-of-mass energies of 7 and 8 TeV with the LHCb detector. Candidate χc1(3872) and ψ(2S) mesons from b-hadron decays are selected in the J/ψπ+π- decay mode. Describing the lineshape with a Breit-Wigner function, the mass splitting between the χc1(3872) and ψ(2S) states, Δm, and the width of the χc1(3872) state, ΓBW, are determined to be Δm=185.598±0.067±0.068 MeV,ΓBW=1.39±0.24±0.10 MeV, where the first uncertainty is statistical and the second systematic. Using a Flatté-inspired model, the mode and full width at half maximum of the lineshape are determined to be mode=3871.69-0.04-0.13+0.00+0.05 MeV,FWHM=0.22-0.06-0.13+0.07+0.11 MeV. An investigation of the analytic structure of the Flatté amplitude reveals a pole structure, which is compatible with a quasibound D0D¯∗0 state but a quasivirtual state is still allowed at the level of 2 standard deviations.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1103/PHYSREVD.102.092005
