EuNPC2015

The CLAS experiment at CEBAF at Jefferson Laboratory investigates photon scattering on the proton with high intensities. The analysis presented in this talk focuses on the reaction γp → pπ + π − η to investigate excitations of η mesons. The observed η as well as the η(1295) and η(1405) decay preferably to π + π − η. The main goal is to improve the present knowledge of these states. Based on SU(3) symmetry for the light mesons a singlet as well as an octet is formed. Each contains one isoscalar state which mix to the lightest pseudoscalar mesons η and η. Thus two first radial excitations are expected, but three states were found: η(1295), η(1405) and η(1475). The η(1405) is debated to be a gluonic bound state, because it has been observed in gluon rich production mechanisms only. In this scenario the η(1405) should have a low production cross sections in γγ fusion or photoproduction. We report on the measurement of η and η(1405) production cross section in γp → pπ + π − η.