η-production on the proton via electromagnetic and hadronic probes

HE Jun

doi:10.1088/1674-1137/33/12/020

Chinese Physics C> 2009, Vol. 33> Issue(12) : 1175-1182 DOI: 10.1088/1674-1137/33/12/020

η-production on the proton via electromagnetic and hadronic probes

HE Jun

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The reactions π^－p→ηn and γp→ηp are investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson-baryon channels included are πN, ηN, πΔ, σN, and ρN. The direct η-photoproduction process is studied within a formalism based on a chiral constituent quark model approach, complemented with a one-gluon-exchange mechanism, to take into account the breakdown of the SU(6)⊙O(3) symmetry. In the models search, the following known nucleon resonances are embodied: S₁₁(1535), S₁₁(1650), P₁₁(1440), P₁₁(1710), P₁₃(1720), D₁₃(1520), D₁₃(1700), D₁₅(1675), and F₁₅(1680). Data for the π^－p→ηn reaction from threshold up to a total center-of-mass energy of W≈2 GeV are satisfactorily reproduced. For the photoproduction channel, two additional higher mass known resonances, P₁₃(1900) and F₁₅(2000), are also considered. However, reproducing the data for γp→ηp requires, within our approach, two new nucleon resonances, for which we extract mass and width.

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HE Jun. η-production on the proton via electromagnetic and hadronic probes[J]. Chinese Physics C, 2009, 33(12): 1175-1182. doi: 10.1088/1674-1137/33/12/020

HE Jun. η-production on the proton via electromagnetic and hadronic probes[J]. Chinese Physics C, 2009, 33(12): 1175-1182. doi: 10.1088/1674-1137/33/12/020 shu

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Received: 2009-08-07
Revised: 1900-01-01

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沈阳化工大学材料科学与工程学院沈阳 110142

η-production on the proton via electromagnetic and hadronic probes

HE Jun

Received Date: 2009-08-07
Accepted Date: 1900-01-01
Available Online: 2009-12-05

Abstract:

The reactions π^－p→ηn and γp→ηp are investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson-baryon channels included are πN, ηN, πΔ, σN, and ρN. The direct η-photoproduction process is studied within a formalism based on a chiral constituent quark model approach, complemented with a one-gluon-exchange mechanism, to take into account the breakdown of the SU(6)⊙O(3) symmetry. In the models search, the following known nucleon resonances are embodied: S₁₁(1535), S₁₁(1650), P₁₁(1440), P₁₁(1710), P₁₃(1720), D₁₃(1520), D₁₃(1700), D₁₅(1675), and F₁₅(1680). Data for the π^－p→ηn reaction from threshold up to a total center-of-mass energy of W≈2 GeV are satisfactorily reproduced. For the photoproduction channel, two additional higher mass known resonances, P₁₃(1900) and F₁₅(2000), are also considered. However, reproducing the data for γp→ηp requires, within our approach, two new nucleon resonances, for which we extract mass and width.