The results of a study of the annihilation reactions (n) over bar p --> phi pi(+) and (n) over bar p --> omega pi(+) are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from similar to 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) over bar s quark content in the nucleon offers a fairly plausible explanation for such an effect. (C) 1999 Elsevier Science B.V. All rights reserved.
Study of (n)over-barp -> phi pi(+) and (n)over-barp -> omega pi(+) annihilation reactions in flight
PUDDU, GIOVANNA;USAI, GIANLUCA;
1999-01-01
Abstract
The results of a study of the annihilation reactions (n) over bar p --> phi pi(+) and (n) over bar p --> omega pi(+) are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from similar to 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) over bar s quark content in the nucleon offers a fairly plausible explanation for such an effect. (C) 1999 Elsevier Science B.V. All rights reserved.
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