The Search for Exotic Mesons in gamma p -> pi+pi+pi-n with CLAS at Jefferson Lab [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy. Office of Science, 2011.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Additional Creators:: Thomas Jefferson National Accelerator Facility (U.S.), United States. Department of Energy. Office of Science, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

The π₁(1600), a J{sup PC} = 1{sup ∓} exotic meson has been observed by experiments using pion beams. Theorists predict that photon beams could produce gluonic hybrid mesons, of which the π₁(1600) is a candidate, at enhanced levels relative to pion beams. The g12 rungroup at Jefferson Lab's CEBAF Large Acceptance Spectrometer (CLAS) has recently acquired a large photoproduction dataset, using a liquid hydrogen target and tagged photons from a 5.71 GeV electron beam. A partial-wave analysis of 502K γp → π⁺π⁺π⁻n events selected from the g12 dataset has been performed, and preliminary fit results show strong evidence for well-known states such as the a₁(1260), a₂(1320), and π₂(1670). However, we observe no evidence for the production of the π₁(1600) in either the partial-wave intensities or the relative complex phase between the 1{sup ∓} and the 2{sup ∓} (corresponding to the π₂) partial waves.

Report Numbers:

E 1.99:jlab-phy-11-1422
E 1.99: doe/or/23177-1837
doe/or/23177-1837
jlab-phy-11-1422

Subject(s):

Hydrogen

Other Subject(s):

Note:

Published through SciTech Connect.
12/01/2011.
"jlab-phy-11-1422"
" doe/or/23177-1837"
Hadron 2011, June 13-17, 2011, Munich, Germany.
Craig Bookwalter.

Funding Information:

AC05-06OR23177

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