Study of anti-n.p -> phi.pi+ and anti-n.p -> omega.pi+ annihilation reactions in flight
- A. Filippi
- M. Agnello
- F. Balestra
- D. Bergo
- E. Botta
- T. Bressani
- M.P. Bussa
- L. Busso
- D. Calvo
- P. Cerello
- S. Costa
- O. Denisov
- C. Fanara
- A. Feliciello
- L. Ferrero
- R. Garfagnini
- A. Grasso
- F. Iazzi
- A. Maggiora
- S. Marcello
- B. Minetti
- N. Mirfakhraee
- A. Panzarasa
- D. Panzieri
- A. Raimondo
- F. Tosello
- L. Valacca
- G. Zosi
- V. Alberico
- A. Bertin
- M. Bruschi
- M. Capponi
- S. De Castro
- R. Donà
- A. Ferretti
- D. Galli
- B. Giacobbe
- U. Marconi
- M. Piccinini
- M. Poli
- N. Semprini Cesari
- R. Spighi
- V. Vagnoni
- S. Vecchi
- F. Vigotti
- M. Villa
- A. Vitale
- A. Zoccoli
- M. Corradini
- A. Donzella
- E. Lodi Rizzini
- L. Venturelli
- A. Zenoni
- C. Cicalò
- A. Masoni
- S. Mauro
- G. Puddu
- S. Serci
- P. Temnikov
- G. Usai
- O.E. Gorchakov
- S.N. Prakhov
- A.M. Rozhdestvensky
- M.G. Sapozhnikov
- V.I. Tretyak
- P. Gianotti
- C. Guaraldo
- A. Lanaro
- V. Lucherini
- F. Nichitiu
- C. Petrascu
- V. Ableev
- C. Cavion
- U. Gastaldi
- M. Lombardi
- G. Maron
- L. Vannucci
- G. Vedovato
- G. Bendiscioli
- V. Filippini
- A. Fontana
- P. Montagna
- A. Rotondi
- P. Salvini
- C. Scoglio
- G. Pauli
- S. Tessaro
- L. Santi
DOIAbstract
The results of a study of the annihilation reactions and are reported; the data were collected by the OBELIX apparatus, with antineutrons annihilating in flight (momenta from ∼ 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 quark content in the nucleon offers a fairly plausible explanation for such an effect
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