The N*(1520) ---> Delta pi Amplitudes Extracted from the gamma p ---> pi+ pi- p Reaction and Comparison to Quark Models

Abstract

The gamma p ---> pi+ pi- p reaction, in combination with data from the pi N ---> pi pi N reaction, allows one to obtain the s- and d-wave amplitudes for the N*(1520) decay into Delta pi with absolute sign with respect to the N*(1520) ---> N gamma helicity amplitudes. In addition one obtains the novel information on the q dependence of the amplitudes. This dependence fits exactly with the predictions of the non-relativistic constituent quark models. The absolute values provided by these models agree only qualitatively, and a discussion is done on the reasons for it and possible ways to improve.

12 pages, 1 figure, TeX, Version 3.141 [PD VMS 3.4/CERN 1.0]

References in corpus (2)

• Quasi-Two-Body Decays of Nonstrange Baryons
• Effective Lagrangian Approach to the Theory of Eta Photoproduction in the $N^{\ast }(1535)$ Region

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• Chiral approach to the rho meson in nuclear matter
• High statistics study of the reaction $\gamma p\to p2{\pi }^0$
• The role of Delta(1700) excitation and rho production in double pion photoproduction
• Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton
• The role of the Roper resonance in n p --> d (pi pi)
• Study of polarization observables in double pion photoproduction on the proton
• Helicity asymmetries in double pion photoproduction on the proton
• A model for pion Delta electroproduction on the proton
• Extraction of Electrostrong Parameters of $N^{\ast }(1520)$ from Eta Photoproduction