Prediction of a Z(c)(4000) state and relationship with the claimed Z(c)(4025)


Aceti F., Bayar M. , Dias J. M. , Oset E.

EUROPEAN PHYSICAL JOURNAL A, cilt.50, 2014 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: 50 Konu: 6
  • Basım Tarihi: 2014
  • Doi Numarası: 10.1140/epja/i2014-14103-1
  • Dergi Adı: EUROPEAN PHYSICAL JOURNAL A

Özet

After discussing the OZI suppression of one light meson exchange in the interaction of with isospin I = 1 , we study the contribution of the two-pion exchange to the interaction and the exchange of heavy vectors, J/psi for diagonal transitions and D-* for transitions of to J/psi rho. We find these latter mechanisms to be weak, but enough to barely bind the system in J = 2 with a mass around 4000 MeV, while the effect of the two-pion exchange is a net attraction, though weaker than that from heavy-vector exchange. We discuss this state and try to relate it to the Z (c) (4025) state, above the threshold, claimed in an experiment at BES from an enhancement of the distribution close to threshold. Together with the results from a recent reanalysis of the BES experiment showing that it is compatible with a J = 2 state below threshold around 3990 MeV, we conclude that the BES experiment could show the existence of the state that we find in our approach.