Eur. Phys. J. A (2007) 32: 311-319
https://doi.org/10.1140/epja/i2007-10385-6

Regular Article - Hadron Physics

Photoproduction of η -mesons on the deuteron above S₁₁(1535) in the presence of a narrow P₁₁(1670) -resonance

¹ Institut für Kernphysik, Johannes Gutenberg-Universität Mainz, D-55099, Mainz, Germany
² Institut für Theoretische Physik II, Ruhr-Universität Bochum, D-44780, Bochum, Germany

^* e-mail: fix@mph.phtd.tpu.edu.ru

Received: 13 February 2007
Accepted: 18 May 2007
Published online: 12 June 2007

Abstract

Incoherent photoproduction of η -mesons on the deuteron is considered. The main attention is paid to the region above the S ₁₁(1535) -resonance where a rather narrow resonance-like structure in the total cross-section extracted for γn → ηn has been reported. The corresponding experimental results are analyzed from the phenomenological standpoint within the model containing a baryon P₁₁ with a mass of about 1670MeV and a width less than 30MeV. This resonance was suggested in some recent works as a nonstrange member of the pentaquark antidecuplet with J ^P = 1/2⁺ . The calculation is also performed for the polarized and unpolarized angular distributions of η -mesons. In addition, we present our predictions for the cross-sections of the neutral kaons and double pion photoproduction, where the same narrow P ₁₁(1670) -resonance is assumed to contribute through the decay into K ⁰Λ and πΔ configuration.