Exotic meson production in the f(1)(1285)pi(-) system observed in the reaction pi(-)p ->eta pi(+)pi(-)pi(-)p at 18 GeV/cстатья
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Аннотация:This Letter reports results from the partial wave analysis of the pi(-)pi(-)pi(+)eta final state in pi(-)p collisions at 18 GeV/c. Strong evidence is observed for production of two mesons with exotic quantum numbers of spin, parity and charge conjugation, J(PC) = 1(-+) in the decay channel f(1) (1285)pi(-). The mass M = 1709 +/- 24 +/- 41 MeV/c(2) and width F = 403 +/- 80 +/- 115 MeV/c(2) of the first state are consistent with the parameters of the previously observed pi(1) (1600). The second resonance with mass M = 2001 +/- 30 +/- 92 MeV/c(2) and width F = 333 +/- 52 +/- 49 MeV/c(2) agrees very well with predictions from theoretical models. In addition, the presence Of pi(2)(1900) is confirmed with mass M = 2003 +/- 88 +/- 148 MeV/c(2) and width F = 306 +/- 132 +/- 121 MeV/c(2) and a new state, a(1) (2096), is observed with mass M = 2096 +/- 17 +/- 121 MeV/c(2) and width Gamma = 451 +/- 41 +/- 81 MeV/c(2). The decay properties of these last two states are consistent with flux tube model predictions for hybrid mesons with non-exotic quantum numbers. (C) 2004 Elsevier B.V. All rights reserved.