We report on the results of the first measurement of exclusive f0(980) meson photoproduction on protons for Eγ=3.0–3.8 GeV and −t=0.4–1.0 GeV2. Data were collected with the CLAS detector at the Thomas Jefferson National Accelerator Facility. The resonance was detected via its decay in the π+π− channel by performing a partial wave analysis of the reaction γp→pπ+π−. Clear evidence of the f0(980) meson was found in the interference between P and S waves at Mx+x~1 GeV. The S-wave differential cross section integrated in the mass range of the f0(980) was found to be a factor of about 50 smaller than the cross section for the ƿ meson. This is the first time the f0(980) meson has been measured in a photoproduction experiment.
Physical Review Letters
Battaglieri, M.; Biselli, Angela; and CLAS Collaboration, "Measurement of Direct f0(980) Photoproduction on the Proton" (2009). Physics Faculty Publications. 54.
M. Battaglieri et al. [CLAS Collaboration], "Measurement of Direct f0(980) Photoproduction on the Proton," Physical Review Letters 102.10 (2009) DOI: 10.1103/PhysRevLett.102.102001
Copyright American Physical Society Publisher final version available at http://prl.aps.org/pdf/PRL/v102/i10/e102001