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Titolo:
Nucleonic resonance effects in the phi meson photoproduction
Autore:
Zhao, Q; Didelez, JP; Guidal, M; Saghai, B;
Indirizzi:
Inst Phys Nucl, F-91406 Orsay, France Inst Phys Nucl Orsay France F-91406 nst Phys Nucl, F-91406 Orsay, France CEA Saclay, Serv Phys Nucl, DAPNIA, DSM, F-91191 Gif Sur Yvette, France CEA Saclay Gif Sur Yvette France F-91191 F-91191 Gif Sur Yvette, France
Titolo Testata:
NUCLEAR PHYSICS A
fascicolo: 3, volume: 660, anno: 1999,
pagine: 323 - 347
SICI:
0375-9474(19991129)660:3<323:NREITP>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
QUARK-MODEL; POLARIZATION OBSERVABLES; STRANGENESS CONTENT; ANNIHILATION; PROTON; REST; SCATTERING;
Keywords:
phenomenological quark model; photoproduction reactions; meson production; polarization;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Zhao, Q Inst Phys Nucl, BP 1, F-91406 Orsay, France Inst Phys Nucl BP 1 Orsay France F-91406 1, F-91406 Orsay, France
Citazione:
Q. Zhao et al., "Nucleonic resonance effects in the phi meson photoproduction", NUCL PHYS A, 660(3), 1999, pp. 323-347

Abstract

The process gamma p --> phi p close to threshold is investigated focusing on the role played by the sand u-channel nucleonic resonances. For this purpose, a recent quark model approach, based on the SU(6) x O(3) symmetry with an effective Lagrangian, is extended to the phi meson photoproduction. Another non-diffractive process, the t-channel pi(0) exchange, is also included. The diffractive contribution is produced by the t-channel Pomeron exchange. Contributions from non-diffractive s- and u-channel processes are found small in the case of cross sections and polarization observables at forward angles. However, backward angle polarization asymmetries show high sensitivity to this non-diffractive process. Different prescriptions to keep gauge invariance for the Pomeron exchange amplitudes are investigated. Possible deviations from the exact SU(6) x O(3) symmetry, due to the configurationmixing, are also discussed. (C) 1999 Elsevier Science B.V. All rights reserved.

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Documento generato il 16/07/20 alle ore 16:43:40