Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial-wave analysis

A. V. Anisovich; E. Klempt; V. A. Nikonov; M. A. Matveev; A. V. Sarantsev; U. Thoma

doi:10.1140/epja/i2010-10950-x

EPJ

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2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2010) 44: 203-220
https://doi.org/10.1140/epja/i2010-10950-x

Regular Article - Experimental Physics

Photoproduction of pions and properties of baryon resonances from a Bonn-Gatchina partial-wave analysis

A. V. Anisovich¹^,2, E. Klempt¹^*, V. A. Nikonov¹^,2, M. A. Matveev¹^,2, A. V. Sarantsev¹^,2 and U. Thoma¹

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
² Petersburg Nuclear Physics Institute, Gatchina, Russia

^* e-mail: klempt@hiskp.uni-bonn.de

Received: 27 November 2009
Revised: 19 February 2010
Accepted: 3 March 2010
Published online: 9 April 2010

Abstract

Masses, widths and photocouplings of baryon resonances are determined in a coupled-channel partial-wave analysis of a large variety of data. The Bonn-Gatchina partial-wave formalism is extended to include a decomposition of t and u exchange amplitudes into individual partial waves. The multipole transition amplitudes for $\gamma$ p $\rightarrow$ p $\pi^{0}_{}$ and $\gamma$ p $\rightarrow$ n $\pi^{+}_{}$ are given and compared to results from other analyses.