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η-production on the proton via electromagnetic and hadronic probes

Conference · · Chinese Physics C

The reactions pi?p -> pi-n and gamma-p -> eta-p are investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson-baryon channels included are pi-N, eta-N, pi-Delta, sigma-N, and sigma-N. The direct eta-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) otimes 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 pi-p -> eta-n reaction from threshold up to a total center-of-mass energy of W thickapprox 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 gamma-p -> eta-p requires, within our approach, two new nucleon resonances, for which we extract mass and width.

Research Organization:
Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Nuclear Physics (NP)
DOE Contract Number:
AC05-06OR23177
OSTI ID:
1999408
Report Number(s):
JLAB-THY-09-1074; DOE/OR/23177-1083
Journal Information:
Chinese Physics C, Journal Name: Chinese Physics C Journal Issue: 12 Vol. 33; ISSN 1674-1137
Country of Publication:
United States
Language:
English

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