The photoproduction of possible hybrid mesons at =110 GEV

The search for exotic resonances is one of the most active areas in light meson spectroscopy at the present time. From a study of high energy photoproduction on experiment E687 at Fermi National Accelerator Laboratory, two candidates for hybrid states are observed. The first is a state with a decay into ƒ₁(1285)π which has a mass of 1748 ± 12 MeV and a width of 136 ± 30 MeV, whose decay angular distributions suggest the true exotic quantum numbers J^PC = 1^-+. The second is a state of mass 1914±33 MeV and width 389±115 MeV, produced with almost no background, which decays to Φη and whose angular distributions indicate J^PC = ^--. Close and Page predict the existence of a hybrid vector meson that decays to Φη. However their theoretical width is much less than our experimental value.