Study of the reaction γp → pπ0η

I. Horn; A. V. Anisovich; G. Anton; R. Bantes; O. Bartholomy; R. Beck; Y. Beloglazov; R. Bogendörfer; R. Castelijns; V. Credé; A. Ehmanns; J. Ernst; I. Fabry; H. Flemming; A. Fösel; M. Fuchs; Ch. Funke; R. Gothe; A. Gridnev; E. Gutz; S. Höffgen; J. Hößl; J. Junkersfeld; H. Kalinowsky; F. Klein; E. Klempt; H. Koch; M. Konrad; B. Kopf; B. Krusche; J. Langheinrich; H. Löhner; I. Lopatin; J. Lotz; H. Matthäy; D. Menze; J. Messchendorp; V. Metag; V. A. Nikonov; D. Novinski; M. Ostrick; H. van Pee; A. V. Sarantsev; C. Schmidt; H. Schmieden; B. Schoch; G. Suft; V. Sumachev; T. Szczepanek; U. Thoma; D. Walther; Ch. Weinheimer

doi:10.1140/epja/i2008-10657-7

EPJ

Study of the reaction γp → pπ⁰η

The CB-ELSA Collaboration
I. Horn¹, A. V. Anisovich¹^,2, G. Anton³, R. Bantes⁴, O. Bartholomy¹, R. Beck¹, Y. Beloglazov², R. Bogendörfer³, R. Castelijns⁵, V. Credé⁶, A. Ehmanns¹, J. Ernst¹, I. Fabry¹, H. Flemming⁷, A. Fösel³, M. Fuchs¹, Ch. Funke¹, R. Gothe⁴, A. Gridnev², E. Gutz¹, S. Höffgen⁴, J. Hößl³, J. Junkersfeld¹, H. Kalinowsky¹, F. Klein⁴, E. Klempt¹^*, H. Koch⁷, M. Konrad⁴, B. Kopf⁷, B. Krusche⁸, J. Langheinrich⁴, H. Löhner⁵, I. Lopatin², J. Lotz¹, H. Matthäy⁷, D. Menze⁴, J. Messchendorp⁹, V. Metag⁹, V. A. Nikonov¹^,2, D. Novinski², M. Ostrick⁴, H. van Pee¹, A. V. Sarantsev¹^,2, C. Schmidt¹, H. Schmieden⁴, B. Schoch⁴, G. Suft³, V. Sumachev², T. Szczepanek¹, U. Thoma¹, D. Walther¹ and Ch. Weinheimer¹

¹ Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, Bonn, Germany
² Petersburg Nuclear Physics Institute, Gatchina, Russia
³ Physikalisches Institut, Universität Erlangen, Erlangen, Germany
⁴ Physikalisches Institut, Universität Bonn, Bonn, Germany
⁵ Kernfysisch Versneller Instituut, Groningen, The Netherlands
⁶ Department of Physics, Florida State University, Tallahassee, FL, USA
⁷ Institut für Experimentalphysik I, Universität Bochum, Bochum, Germany
⁸ Institut für Physik, Universität Basel, Basel, Switzerland
⁹ II. Physikalisches Institut, Universität Gießen, Gießen, Germany

Received: 26 June 2008
Accepted: 24 September 2008
Published online: 29 October 2008

Abstract

The reaction γp → pπ⁰η has been studied with the CBELSA detector at the tagged photon beam of the Bonn electron stretcher facility. The reaction shows contributions from Δ⁺(1232)η , N(1535)⁺π⁰ and pa ₀(980) as intermediate states. A partial-wave analysis suggests that the reaction proceeds via formation of six Δ -resonances, Δ(1600)P ₃₃ , Δ(1920)P ₃₃ , Δ(1700)D ₃₃ , Δ(1940)D ₃₃ , Δ(1905)F ₃₅ , Δ(2360)D ₃₃ , and two nucleon resonances N(1880)P ₁₁ and N(2200)P ₁₃ , for which pole positions and decay branching ratios are given.

PACS: 13.30.-a Decays of baryons – / 13.60.Le Meson production – / 14.20.Gk Baryon resonances with S = 0 –

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Study of the reaction γp → pπ0η

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Study of the reaction γp → pπ⁰η