Eur. Phys. J. A (2008) 35: 321-324
https://doi.org/10.1140/epja/i2007-10560-9

Regular Article - Theoretical Physics

Chiral constituent quark model study of the process γp → ηp ^⋆

¹ DAPNIA/SPhN, DSM, CEA/Saclay, 91191, Gif-sur-Yvette, France
² Department of Computer and Information Science, University of Maryland, 20783, MD, USA
³ Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, PRC

Received: 14 December 2007
Accepted: 21 January 2008
Published online: 24 March 2008

Abstract

A constituent quark model is developed for the reaction γp → ηp , allowing us to investigate all available data for differential cross-sections as well as single polarization asymmetries (beam and target) by including all of the PDG, one to four star, nucleon resonances (S₁₁, P₁₁, P₁₃, D₁₃, D₁₅, F₁₅, F₁₇, G₁₇, G₁₉, H₁₉, I_1,11, and K_1,13). Issues related to the missing resonances are also briefly discussed by examining possible contributions from several new resonances (S₁₁, P₁₁, P₁₃, D₁₃, D₁₅, and H_1,11).