Observation and quantum numbers determination of the E(1420) meson in pi-p interactions at 3.95 GeV/c

In a high statistics (90 events/ mu b) bubble chamber experiment, the reactions pi /sup -/p to K/sub s//sup 0/K/sup +or-/ pi /sup -or+/n have been studied at 3.95 GeV/c. A significant enhancement is observed in the (KK pi ) system which the authors attribute to the production of the E(1420) meson. F...

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Detalles Bibliográficos
Autores principales: Dionisi, C, Gavillet, P, Armenteros, Rafael, Losty, Michael J, Loverre, P F, Mazzucato, M, Montanet, Lucien, Aguilar-Benítez, M, Fernández, C, Ferrando, A, Rubio, Juan Antonio, Salicio, J, Dobrzynski, Ludwik, Pennino, D, Rodebäck, S, Sjögren, I, Holmgren, S O
Lenguaje:eng
Publicado: 1980
Materias:
Particle Physics - Experiment
Acceso en línea:https://dx.doi.org/10.1016/0550-3213(80)90249-7
http://cds.cern.ch/record/133769
Descripción
Sumario:In a high statistics (90 events/ mu b) bubble chamber experiment, the reactions pi /sup -/p to K/sub s//sup 0/K/sup +or-/ pi /sup -or+/n have been studied at 3.95 GeV/c. A significant enhancement is observed in the (KK pi ) system which the authors attribute to the production of the E(1420) meson. For its mass, M, and width, Gamma , they find M=1426+or-6 MeV and Gamma =40+or-15 MeV. The E(1420) quantum numbers are determined to be I/sup G/J/sup P/=0/sup +/1/sup +/ with a branching ratio E to K*K+c.c./E to ( delta pi +(K*K+c.c.)) =0.86+or-0.12, where delta to KK. The cross section for the reaction pi /sup -/p to En, with E to K/sup 0/K/sup +or-/ pi /sup -or+/, is 8.2+or-1.0 mu b. Forward and backward productions are observed in the approximate ratio 2:1. The SU(3) assignment of the E(1420) meson is discussed. (29 refs).

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