Evidence for exotic meson production in the reaction pi(-)p->eta pi(-)p at 18 GeV/cстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:The eta pi(-) system has been studied in the reaction eta(-)p-->eta pi(-)P at 18 GeV/c. A large asymmetry in the angular distribution is observed indicating interference between L-even and L-odd partial waves. The a(2)(1320) is observed in the J(PC) = 2(++). wave, as is a broad enhancement between 1.2 and 1.6 GeV/c(2) in the 1(-+) wave. The observed phase difference between these waves shows that there is phase motion in addition to that due to a(2)(1320) decay. The data can be fitted by interference between the a(2)(1320) and an exotic 1(-+) resonance with M = (1370 +/- 16(-30)(+50)) MeV/c(2) and Gamma = (385 +/- 40(-105)(+65))MeV/c(2).