Search for the Photoexcitation of Exotic Mesons in the pi(+)pi(+)pi(-) Systemстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A search for exotic mesons in the pi(+)pi(+)pi(-) system photoproduced by the charge exchange reaction gamma p ->pi(+)pi(+)pi(-)(n) was carried out by the CLAS Collaboration at Jefferson Lab. A tagged-photon beam with energies in the 4.8 to 5.4 GeV range, produced through bremsstrahlung from a 5.744 GeV electron beam, was incident on a liquid-hydrogen target. A partial wave analysis was performed on a sample of 83 000 events, the highest such statistics to date in this reaction at these energies. The main objective of this study was to look for the photoproduction of an exotic J(PC)=1(-+) resonant state in the 1 to 2 GeV mass range. Our partial wave analysis shows production of the a(2)(1320) and the pi(2)(1670) mesons, but no evidence for the a(1)(1260), nor the pi(1)(1600) exotic state at the expected levels. An upper limit of 13.5 nb is determined for the exotic pi(1)(1600) cross section, less than 2% of the a(2)(1320) production.