Relativistic calculations for the exclusive photoproduction of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>η</mml:mi></mml:math>mesons from complex nuclei

Hedayati-Poor, M.; Sherif, H.

doi:10.1103/physrevc.56.1557

Cited by 8 publications

(11 citation statements)

References 23 publications

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“…In this paper we extend a previous relativistic model for quasifree photoproduction of η mesons on complex nuclei [7,8] to the case of incoherent η-photoproduction. The main ingredients of the present treatment are as follows.…”

Section: Introductionmentioning

confidence: 89%

Relativistic calculations for incoherent photoproduction of η mesons

Blokland¹,

Sherif²

2001

Nuclear Physics A

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We develop a relativistic model for incoherent η-photoproduction on nuclei. The elementary process is described using an effective Lagrangian containing photons, nucleons, the S 11 (1535) and D 13 (1520) nucleon resonances, and ρ, ω, and η mesons. The nucleon and η wavefunctions are obtained from relativistic wave equations. Final-state interactions of the outgoing particles are included via optical potentials. The effects of these interactions are found to be large and lead to reduced cross sections.The incoherent cross sections for isovector transitions are much larger than those for isoscalar ones. The dominant contributions are those from the S 11 and D 13 resonances. We find important interference effects between the contributions of these two resonances. We give some detailed calculations for the cross sections for incoherent η-photoproduction on 12 C. We find that the incoherent cross section for a subset of states in the excitation energy region below 17 MeV are significantly larger than those of the coherent process. These cross sections may thus be accessible experimentally.

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Section: Introductionmentioning

confidence: 89%

Relativistic calculations for incoherent photoproduction of η mesons

Blokland¹,

Sherif²

2001

Nuclear Physics A

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“…Earlier relativistic and nonrelativistic studies of the quasifree photoproduction [9,14] show clearly that the reaction is strongly dominated, at energies not too far from threshold, by the S 11 resonance. We therefore restrict the present study to the dominant S 11 contributions.…”

Section: Introductionmentioning

confidence: 89%

Nonlocality and medium effects in the exclusive photoproduction ofηmesons on nuclei

2003

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A relativistic model for the quasifree exclusive photoproduction of mesons on nuclei is extended to include both nonlocal and medium effects. The reaction is assumed to proceed via the dominant contribution of the S 11 ͑1535͒ resonance. The complicated integrals resulting from the nonlocality are simplified using a modified version of a method given by Cooper and Maxwell. The nonlocality effects are found to affect the magnitude of the cross section. Some possible effects of the medium on the propagation and properties of the intermediate S 11 resonance are studied. The effects of allowing S 11 to interact with the medium via mean field scalar and vector potentials are considered. Both broadening of width and reduction in mass of the resonance lead to a suppression of the calculated cross sections.

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“…This fully non-local model has been discussed recently for the cases of exclusive and incoherent photoproduction [15,16]. These non-local calculations, in contrast to earlier local ones [17], allow us to include possible density dependent changes in the mass and width of the resonances in the nuclear medium.…”

Section: Introductionmentioning

confidence: 99%

Inclusive photoproduction of η mesons on nuclei and the in-medium properties of theS11resonance

Hedayati-Poor¹,

Sherif

2007

Phys. Rev. C

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A relativistic non-local model for the inclusive photoproduction of η mesons from complex nuclei is introduced. The model is based on the dominance of the S 11 (1535) resonance. We compare the results of our calculations with the available data on inclusive cross sections for the nuclei C, Al and Cu. Assuming the resonance propagates freely in the nuclear medium, we find that the calculated angular distribution and energy dependence of the cross sections reproduce the data in a reasonable fashion. The present non-local model allows the inclusion of density dependent mass and width in the calculations. Including these in the calculations reveals that the presently available data do not show clear preference for the inclusion of such modifications of the properties of the S 11 (1535) in the nuclear medium.

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Relativistic calculations for the exclusive photoproduction ofηmesons from complex nuclei

Cited by 8 publications

References 23 publications

Relativistic calculations for incoherent photoproduction of η mesons

Relativistic calculations for incoherent photoproduction of η mesons

Nonlocality and medium effects in the exclusive photoproduction ofηmesons on nuclei

Inclusive photoproduction of η mesons on nuclei and the in-medium properties of theS11resonance

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