CERN Accelerating science

Article
Title Study of anti-n p --> phi pi+ and anti-n p --> omega pi+ annihilation reactions in flight
Author(s)

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

Publication 1999
In: Nucl. Phys. A 655 (1999) 453-494
DOI 10.1016/S0375-9474(99)00157-8
Subject category Nuclear Physics - Experiment
Accelerator/Facility, Experiment CERN LEAR ; OBELIX PS201
Abstract 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.

Corresponding record in: Inspire


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