Abstract

The exclusive reaction ?p?pp+p- was studied in the photon energy range 3.0-3.8 GeV and the momentum transfer range 0.4<-t<1.0GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. In this kinematic range, the integrated luminosity was about 20pb-1. The reaction was isolated by detecting the p+ and proton in CLAS, and reconstructing the p- via the missing-mass technique. Moments of the di-pion decay angular distributions were derived from the experimental data. Differential cross sections for the S, P, and D-waves, in the Mp+p- mass range 0.4-1.4 GeV, were derived performing a partial wave expansion of the extracted moments. Beside the dominant contribution of the ?(770) meson in the P-wave, evidence for the f0(980) and the f2(1270) mesons was found in the S and D-waves, respectively. The differential production cross sections ds/dt for individual waves in the mass range of the above-mentioned mesons were extracted. This is the first time the f0(980) has been measured in a photoproduction experiment. © 2009 The American Physical Society.