The results of a study of the annihilation reactions nbar p --> phi pi+ and nbar p --> omega pi+ are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from about 50 MeV/c to 405 MeV/c). Annihilation frequencies and annihilation cross sections have been deduced, for both channels, as a function of antineutron momentum. From the cross section ratio, a substantial deviation from OZI rule expectations is observed. An s-sbar quark content in the nucleon offers a fairly plausible explanation for such an effect.
Study of anti-n p --> phi pi+ and anti-n p --> omega pi+ annihilation reactions in flight.
BALESTRA, Ferruccio;BOTTA, Elena;BRESSANI, Tullio;Bussa MP;BUSSO, Luigi;FERRERO, Livio;GARFAGNINI, Raffaello;GRASSO, Antonino;MARCELLO, Simonetta;ZOSI, Gianfranco;
1999-01-01
Abstract
The results of a study of the annihilation reactions nbar p --> phi pi+ and nbar p --> omega pi+ are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from about 50 MeV/c to 405 MeV/c). Annihilation frequencies and annihilation cross sections have been deduced, for both channels, as a function of antineutron momentum. From the cross section ratio, a substantial deviation from OZI rule expectations is observed. An s-sbar quark content in the nucleon offers a fairly plausible explanation for such an effect.
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