Mixed Charmonium-Molecule Interpretation for the Y (3940) State

37th Brazilian Meeting on Nuclear Physics

Albuquerque, R.M.^1 ; Dias, J.M.^2 ; Nielsen, M.^2 ; Zanetti, C.M.^3

Institute for Theoretical Physics, São Paulo State University (IFT-UNESP), R. Dr. Bento Teobaldo Ferraz 271 - Bl. II Sala 207, São Paulo/SP

01140-070, Brazil^1

Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, São Paulo, SP

05389-970, Brazil^2

Faculdade de Tecnologia, Universidade Do Estado Do Rio de Janeiro, Rod. Presidente Dutra Km 298, Pólo Industrial, Resende, RJ

27537-000, Brazil^3

关键词: Charmonium;    Decay process;    Decay widths;    Final state;    Gammagamma;    Mixing angle;    QCD sum rules;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012044/pdf
DOI  :  10.1088/1742-6596/630/1/012044

来源: IOP

【 摘 要 】

QCD sum rules are used to study the mass and the decay widths of the Y(3940) state. We assume that it can be described by a mixed charmonium-molecule scalar current with JPC= 0++. Using a mixing angle θ = (76.0±5.0)°, we obtain MY= (3.95±0.11) GeV, which is in good agreement with the experimental mass of the Y(3940) state. We also evaluate the decay width in the channels Y → J/ψω and Y → γγ obtaining the values ΓY → j/ψω≈ (1.7± 0.6) MeV and ΓY→γγ≈ (1.6 ± 1.3) KeV, respectively. We also study the decay process of this state into channels containing DD mesons in the final state.