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