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| Paper IPM / Particles / 15500 |
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The mass, coupling and width of the newly observed charged resonance Zc−(4100) are calculated by treating it as a scalar four-quark system with a diquark-antidiquark structure. The mass and coupling of the state Zc−(4100) are calculated using the QCD two-point sum rules. In these calculations we take into account contributions of the quark, gluon and mixed condensates up to dimension ten. The spectroscopic parameters of Zc−(4100) obtained by this way are employed to study its S-wave decays to ηc(1S)π−, ηc(2S)π− and J/ψρ− final states. To this end, we evaluate the strong coupling constants gZcηc1 π, gZcηc2 π and gZcJ/ψρ corresponding to the vertices Zc−(4100)ηc(1S)π−, Zc−(4100)ηc(2S) π− and Zc−(4100)J/ψρ−, respectively. The first two couplings are computed by means of the QCD three-point sum rule method, whereas gZcJ/ψρ is obtained from the QCD light-cone sum rule approach and soft-meson approximation. Obtained result for the mass m=(4080 ±150) MeV of the resonance Zc−(4100) is in excellent agreement with the LHCb data. The prediction for its total width Γ = (128 ±19) MeV is compatible with the data within the errors.
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