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A Study of the Roper Resonance as a Hybrid State from $J/psi $ Decays | | R.G.Ping
; H.Q.Chiang
; B.S.Zou
; | | Date: |
2 Aug 2004 | | Journal: | Nucl.Phys. A743 (2004) 149-169 | | Subject: | nucl-th | | Abstract: | The structure of the Roper resonance as a hybrid baryon is investigated through studying the transitional amplitudes in J/psi-> parN*, N*arN* decays. We begin with perturbative QCD to describe the dynamical process for the J/psi-> 3ar q+3q decay to the lowest order of alpha_s, and by extending the modified quark creation model to the J/psi energy region to describe the J/psi-> 3ar q+3q +g process. The non-perturbative effects are incorporated by a simple quark model of baryons to evaluate the angular distribution parameters and decay widths for the processes J/psi-> pbar N*,N*bar N*. From fitting the decay width of J/psi->gamma p pbar to the experimental data, we extract the quark-pair creation strength g_I=15.40 GeV. Our numerical results for J/psi->pbar N*,N* bar N* decays show that the branching ratios for these decays are quite different if the Roper resonance is assumed to be a common $3q$ state or a pure hybrid state. For testing its mixing properties, we present a scheme to construct the Roper wave function by mixing |qqqg> state with a normal |qqq,2s> state. Under this picture, the ratios of the decay widths to that of the J/psi->p pbar decay are re-evaluated versus the mixing parameter. A test of the hybrid nature of the Roper resonance in J/psi decays is discussed. | | Source: | arXiv, nucl-th/0408007 | | Services: | Forum | Review | PDF | Favorites | |
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