dorsal/arxiv
View SchemaA Study of the Roper Resonance as a Hybrid State from $J/\psi $ Decays
| Authors | R. G. Ping, H. Q. Chiang, B. S. Zou |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/0408007 |
| URL | https://arxiv.org/abs/nucl-th/0408007 |
| DOI | 10.1016/j.nuclphysa.2004.07.004 |
| Journal | Nucl.Phys. A743 (2004) 149-169 |
Abstract
The structure of the Roper resonance as a hybrid baryon is investigated through studying the transitional amplitudes in J/psi-> p\barN*, N*\barN* decays. We begin with perturbative QCD to describe the dynamical process for the J/psi-> 3\bar 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-> 3\bar 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.
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"abstract": "The structure of the Roper resonance as a hybrid baryon is investigated\nthrough studying the transitional amplitudes in J/psi-\u003e p\\barN*, N*\\barN*\ndecays. We begin with perturbative QCD to describe the dynamical process for\nthe J/psi-\u003e 3\\bar q+3q decay to the lowest order of \\alpha_s, and by extending\nthe modified quark creation model to the J/psi energy region to describe the\nJ/psi-\u003e 3\\bar q+3q +g process. The non-perturbative effects are incorporated by\na simple quark model of baryons to evaluate the angular distribution parameters\nand decay widths for the processes J/psi-\u003e pbar N*,N*bar N*. From fitting the\ndecay width of J/psi-\u003egamma p pbar to the experimental data, we extract the\nquark-pair creation strength g_I=15.40 GeV. Our numerical results for\nJ/psi-\u003epbar N*,N* bar N* decays show that the branching ratios for these decays\nare quite different if the Roper resonance is assumed to be a common $3q$ state\nor a pure hybrid state. For testing its mixing properties, we present a scheme\nto construct the Roper wave function by mixing |qqqg\u003e state with a normal\n|qqq,2s\u003e state. Under this picture, the ratios of the decay widths to that of\nthe J/psi-\u003ep pbar decay are re-evaluated versus the mixing parameter. A test of\nthe hybrid nature of the Roper resonance in J/psi decays is discussed.",
"arxiv_id": "nucl-th/0408007",
"authors": [
"R. G. Ping",
"H. Q. Chiang",
"B. S. Zou"
],
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"nucl-th"
],
"doi": "10.1016/j.nuclphysa.2004.07.004",
"journal_ref": "Nucl.Phys. A743 (2004) 149-169",
"title": "A Study of the Roper Resonance as a Hybrid State from $J/\\psi $ Decays",
"url": "https://arxiv.org/abs/nucl-th/0408007"
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