Physics
Scientific paper
Mar 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aps..aprq11007s&link_type=abstract
American Physical Society, APS April Meeting 2012, March 31-Apr 3, 2012, abstract #Q11.007
Physics
Scientific paper
Over twenty years ago QCD-inspired models of hadronic states suggested the existence of mesons beyond the Naive Quark Model (NQM), which motivated a rigorous search for exotic mesons. The lightest of these states is the π1(1400) decaying to η-circ;, this was observed in E852 at Brookhaven and confirmed in data previously taken for VES at IHEP. Photoproduction is predicted to favor production of the J^PC=1^-+ state resulting in the increase of the ratio of π1 to a2 mesons. A Partial Wave Analysis was conducted on the reaction γp->++circ;X->p+circ;-circ;(η), using the ++circ; to select the π exchange. The analysis has shown the final spectra of the resonance decaying to η-circ; to be dominated by the quantum state of J^PC=2^++ corresponding to the presence of the a2(1320). The J^PC=1^-+ state, shows no structure in the intensity distribution. However, the phase difference between the J^PC=1^-+ and J^PC=2^++ amplitudes show the interference between the two states. The PWA mass independent fits, along with the mass dependent fits of the partial wave results, will be shown.
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