Pion exchange in an S wave between hadrons that are themselves in a relative S wave can shift energies by hundreds of MeV. In the case of charmed mesons D, D;{*}, D0, D1, a spectroscopy of quasimolecular states may arise consistent with enigmatic charmonium states observed above 4 GeV in e;{+}e;{-} annihilation. A possible explanation of Y(4260) --> psipipi and Y(4360) --> psi;{'}pipi is found. Searches in DD[over]3pi channels as well as B decays are recommended to test this hypothesis.
We demonstrate the calculation of the coupling constants and form factors required by effective hadron lagrangians using the quark model. These relations follow from equating expressions for strong transition amplitudes in the two approaches. As examples we derive the NNm nucleonmeson coupling constants and form factors for m = π, η, η ′ , σ, a0, ω and ρ, using harmonic oscillator quark model meson and baryon wavefunctions and the 3 P0 decay model; this is a first step towards deriving a quark-based model of the NN force at all separations. This technique should be useful in the application of effective lagrangians to processes in which the lack of data precludes the direct determination of coupling constants and form factors from experiment.
Pion exchange in S-wave between hadrons that are themselves in a relative S-wave are shown to shift energies by hundreds of MeV. In the case of charmed mesons D, D * , D 0 , D 1 a spectroscopy of quasi-molecular states may arise consistent with enigmatic charmonium states observed above 4 GeV in e + e − annihilation. A possible explanation of Y (4260) → ψππ and Y (4360) → ψ ′ ππ is found. Searches in D D3π and B B3π channels are recommended to test this hypothesis. An exotic 1 −+ in D Dππ (non D * D * ) is predicted.
Abstract. We report on investigations of the applicability of non-relativistic constituent quark models to the low-energy nucleon-nucleon (NN) interaction. The major innovations of a resulting NN potential are the use of the 3 P 0 decay model and quark model wave functions to derive nucleon-nucleon-meson form-factors, and the use of a colored spin-spin contact hyperfine interaction to model the repulsive core rather than the phenomenological treatment common in other NN potentials. We present the results of the model for experimental free NN scattering phase shifts, S-wave scattering lengths and effective ranges and deuteron properties. Plans for future study are discussed.
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