2011/08/31 by Bookwalter, Craig
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #Nuclear Experiment (nucl-ex)
paper · doi:10.48550/arxiv.1108.6112
The π1(1600), a JPC = 1-+ 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-+ and the 2-+ (corresponding to the π2) partial waves.