Incoherent pion photoproduction on the deuteron including polarization effects

Darwish, E. M.; Al-Thoyaib, S. S.

doi:10.1016/j.aop.2010.09.014

Cited by 18 publications

(8 citation statements)

References 69 publications

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“…Further developments of this topic (see [10][11][12][13][14][15][16][17] and references therein) included improvements of the elementary γN → πN amplitude, predictions for the unpolarized and polarized (polarized beam, target or both, see [10,[12][13][14][15][16] and references therein) observables in the γd → πNN reactions, and comparison with new data. Different models for γN → πN amplitude were used in the above mentioned papers, i.e., MAID [18] (Refs.…”

Section: Introductionmentioning

confidence: 99%

Extracting the photoproduction cross sections off the neutron, via theγn→π−preaction, from deuteron data with final-state interaction effects

Tarasov

Briscoe

et al. 2011

Phys. Rev. C

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The incoherent pion photoproduction reaction γd → π − pp is considered theoretically in a wide energy region E th ≤ E γ ≤ 2700 MeV. The model applied contains the impulse approximation as well as the NN-and πN -FSI amplitudes. The aim of the paper is to study a reliable way for getting the information on elementary γn → π − p reaction cross section beyond the impulse approximation for γd → π − pp. For the elementary γN → πN , NN → NN , and πN → πN amplitudes, the results of the GW DAC are used. There are no additional theoretical constraints. The calculated cross sections dσ/dΩ(γd → π − pp) are compared with existing data. The procedure used to extract information on the differential cross section dσ/dΩ(γn → π − p) on the neutron from the deuteron data using the FSI correction factor R is discussed. The calculations for R versus π − p CM angle θ 1 of the outgoing pion are performed at different photon-beam energies with kinematical cuts for "quasi-free" process γn → π − p. The results show a sizeable FSI effect R = 1 from S-wave part of pp-FSI at small angles close to θ 1 ∼ 0: this region narrows as the photon energy increases. At larger angles, the effect is small (|R−1| ≪ 1) and agrees with estimations of FSI in the Glauber approach.

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Section: Introductionmentioning

confidence: 99%

Extracting the photoproduction cross sections off the neutron, via theγn→π−preaction, from deuteron data with final-state interaction effects

Tarasov

Briscoe

et al. 2011

Phys. Rev. C

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“…The factor r in Eqs. (24) gives the FSI correction to the γp → π 0 p (γn → π 0 n) differential cross section on the proton (neutron) in the case 1 (2). Integrating over spectator momentum p 2 , we obtain…”

Section: Analysis Of the γD → π − Pp Datamentioning

confidence: 99%

“…(See Refs. [16][17][18][19][20][21][22][23][24][25][26][27] and references therein). Observables in the γd reactions have been compared with new measurements as they became available.…”

Section: Introductionmentioning

confidence: 99%

On the Photoproduction Reactions $γd\toπNN$

Briscoe,

Kudryavtsev,

Strakovsky

et al. 2021

Preprint

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A review of our works providing a theoretical description of incoherent pion photoproduction on the deuteron is presented. The existing γd → πNN data are analysed, especially those obtained more recently by the CLAS Collaboration at JLab, the A2 Collaboration at MAMI at Mainz, and the PION@MAX-lab Collaboration at Lund. A procedure, which accounts for the final-state interactions (FSI), is applied to extract γn → πN differential cross sections from the deuteron data. The role of FSI is discussed. We also comment on the results of other works in connection with some discrepancies seen in comparing the model with experiment. The electromagnetic properties of baryon N * resonances, improved using the extracted γn → πN differential cross sections are presented. A model description of the cross section data from charged-pion photoproduction reactions γd → π ± N N near threshold is also given. The γd → π − pp data are used to extract the E 0+ multipole and total cross section of the reaction γn → π − p near threshold.

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“…During the last two decades, pseudoscalar meson production in electromagnetic reactions on light nuclei has become a very active field of research in medium-energy nuclear physics with respect to the study of hadron structure [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22]. For the following reasons the deuteron plays an outstanding role besides the free nucleon.…”

Section: Introductionmentioning

confidence: 99%

Untitled

2021

Sohag J. Sci

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Incoherent pion photoproduction on the deuteron in the ∆ (1232)-resonance region is investigated with special emphasis on polarization observables. For the elementary pion photoproduction operator an effective Lagrangian model which includes the standard pseudovector Born terms and a resonance contribution from the ∆ (1232)-excitation is used. Our results for the elementary γN → πN reaction are in good agreement with recent experimental data and results of other theoretical calculations. A general analysis of all possible polarization observables for the γd → πNN reaction with polarized photon beam and/or oriented deuteron target is presented. The unpolarized differential cross section, photon asymmetry, vector and tensor target asymmetries are predicted for forthcoming experiments.

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Incoherent pion photoproduction on the deuteron including polarization effects

Cited by 18 publications

References 69 publications

Extracting the photoproduction cross sections off the neutron, via theγn→π−preaction, from deuteron data with final-state interaction effects

Extracting the photoproduction cross sections off the neutron, via theγn→π−preaction, from deuteron data with final-state interaction effects

On the Photoproduction Reactions $γd\toπNN$

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