The search for exotic mesons in ηπ- From photoproduction with CLAS

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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 hp- observed by experiment E852 at Brookhaven [1] and the VES collaboration at IHEP. Photoproduction is predicted to favor production of a JPC = 1-+ gluonic excitation resulting in the increase of the ratio of π1 to a2 mesons. A Partial Wave Analysis was conducted on the reaction γ p → Δ++X → pπ+π-(η), using the Δ++ to select the pion exchange. The analysis has shown the final spectra of the resonance decaying to ηπ- to be dominated by the quantum state of JPC = 2++ corresponding to the presence of the a2(1320). The JPC = 1-+ state, shows no structure in the intensity distribution. The phase difference between the JPC = 1-+ and JPC = 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 for the ηπ-.

Original languageEnglish (US)
JournalProceedings of Science
StatePublished - 2012
Externally publishedYes
Event10th Conference on Quark Confinement and the Hadron Spectrum, Confinement 2012 - Munich, Germany
Duration: Oct 8 2012Oct 12 2012

ASJC Scopus subject areas

  • General


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