χ[subscript c1] and χ[subscript c2] Resonance Parameters with the Decays χ[subscript c1;c2] → J=ψμ[superscript +] μ[superscript −]
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PhysRevLett.119.221801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Alfonso Albero, A.
Ali, S.
Date Issued
November 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R., et al. “χ[subscript c1] and χ[subscript c2] Resonance Parameters with the Decays χ[subscript c1,c2] → J/ψμ[superscript +]μ[superscript −].” Physical Review Letters, vol. 119, no. 22, Nov. 2017. © 2017 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
The decays χ[subscript c1]→J/ψμ[superscript +]μ[superscript -] and χ[superscript c2]→J/ψμ[superscript +]μ[superscript -] are observed and used to study the resonance parameters of the χ[subscript c1] and χ[subscript c2] mesons. The masses of these states are measured to be m(χ[subscript c1])=3510.71±0.04(stat)±0.09(syst) MeV and m(χ[subscript c2])=3556.10±0.06(stat)±0.11(syst) MeV, where the knowledge of the momentum scale for charged particles dominates the systematic uncertainty. The momentum-scale uncertainties largely cancel in the mass difference m(χ[subscript c2])-m(χ[subscript c1])=45.39±0.07(stat)±0.03(syst) MeV. The natural width of the χ[subscript c2] meson is measured to be Γ(χ[subscript c2])=2.10±0.20(stat)±0.02(syst) MeV. These results are in good agreement with and have comparable precision to the current world averages.
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
http://dx.doi.org/10.1103/PhysRevLett.119.221801
