Abstract
A model has been developed for describing the cross section for the reaction γr,v p → π−Δ++ in the energy region of nucleon-resonance excitation, and relevant calculations have been performed. The model takes into account the contribution of all reliably established resonances with masses less than 2 GeV and the contributions of nonresonance mechanisms in the approximation of Born diagrams. On the basis of data on the amplitudes of pion-nucleon interactions, a method has been evolved for phenomenologically describing the coupling of initial and final states with open inelastic channels. Calculations performed in this study represent a first step in developing a method for determining the electromagnetic form factors for nucleon resonances in exclusive reactions of pion-pair production on a nucleon by real and virtual photons.
References
V. D. Burkert, Nucl. Phys. A 623, 59 (1997).
M. Ripani, Nucl. Phys. A 623, 110 (1997).
V. D. Burkert, M. Ripani, et al., CEBAF Experiment E-93-006.
R. Koniuk and N. Isgur, Phys. Rev. Lett. 44, 845 (1980); Phys. Rev. D 21, 1868 (1980); R. Koniuk, Nucl. Phys. B 195, 452 (1982)
S. Capstic and W. Roberts, Phys. Rev. D 49, 4570 (1994).
F. A. Berens and A. Donnachie, Nucl. Phys. B 84, 342 (1975).
R. A. Arndt, I. I. Strakovsky, and R. L. Workman, Phys. Rev. C 53, 430 (1996).
V. I. Mokeev, M. Anghinolfi, M. Battaglieri, et al., Few-Body Syst. Suppl. (in press).
M. Anghinolfi, M. Battaglieri, E. N. Golovach, et al., Yad. Fiz. 62, 1522 (1999) [Phys At. Nucl. 62, 1437 (1999)].
Cambridge Bubble Chamber Group, Phys. Rev. 155, 1477 (1967); ABBHM Collab., Phys. Rev. 175, 1669 (1968).
K. Gottfried and J. D. Jackson, Nuovo Cimento 34, 736 (1964).
D. M. Manley and E. M. Salesky, Phys. Rev. D 45, 4002 (1992).
Particle Data Group, Phys. Rev. D 54, 1 (1996).
A. Bartl, W. Majerotto, and D. Schildknecht, Nuovo Cimento A 12, 703 (1972).
C. J. Bebek et al., Phys. Rev. D 17, 1693 (1978).
R. Machleidt, Adv. Nucl. Phys. 19, 189 (1979).
J. M. Blatt and U. F. Weisskopf, Theoretical Nuclear Physics (Wiley, New York, 1952).
S. A. Dytman, T. P. Vrana, and T.-S. H. Lee, nucl-th/9702033.
J. A. Gómez-Tejedor and E. Oset, Nucl. Phys. A 571, 667 (1994); 600, 413 (1996).
C. Mukhopadhyay, J. F. Zhang, and M. Benmerrouche, nucl-th/9612061.
S. A. Dytman, T. P. Vrana, and T.-S. H. Lee, πN News-letters 13, 90 (1997).
Author information
Authors and Affiliations
Additional information
__________
Translated from Yadernaya Fizika, Vol. 63, No. 1, 2000, pp. 87–92.
Original Russian Text Copyright © 2000 by Anghinolfi, Battaglieri, Golovach, Ishkhanov, Mokeev, Osipenko, Ricco, Ripani, Sapunenko, Taiuti, Fedotov.
Rights and permissions
About this article
Cite this article
Anghinolfi, M., Battaglieri, M., Golovach, E.N. et al. Description of initial-and final-state-interaction effects for the reaction γp → π−Δ++ in the region of nucleon-resonance excitation. Phys. Atom. Nuclei 63, 76–81 (2000). https://doi.org/10.1134/1.855608
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1134/1.855608