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The results of a study of the annihilation reactions anti-n p → ϕ π+ and anti-n p → ω π+ 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 anti-s s quark content in the nucleon offers a fairly plausible explanation for such an effect.

Study of anti-n p → ϕ π+ and anti-n p → ω π+ Annihilation Reactions in Flight / Filippi, A; Agnello, M; Balestra, F; Bergo, D; Botta, E; Bressani, T; Bussa, MP; 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; Semprini Cesari, N; Spighi, R; Vagnoni, V; Vecchi, S; Vigotti, F; Villa, M; Vitale, A; Zoccoli, A; Corradini, M; Donzella, A; Rizzini, EL; Venturelli, L; Zenoni, A; Cicalò, C; Masoni, A; Mauro, S; Puddu, G; Serci, S; Temnikov, P; Usai, G; Gorchakov, OE; Prakhov, SN; Rozhdestvensky, AM; Sapozhnikov, MG; Tretyak, VI; Gianotti, P; Guaraldo, C; Lanaro, A; Lucherini, V; Nichitiu, F; Petrascu, C; Ableev, V; Cavion, C; Gastaldi, U; 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. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 655:3-4(1999), pp. 453-494. [10.1016/S0375-9474(99)00157-8]

Study of anti-n p → ϕ π+ and anti-n p → ω π+ Annihilation Reactions in Flight

Bertin, A;Capponi, M;De Castro, S;Donà, R;Galli, D;Semprini Cesari, N;Vigotti, F;Villa, M;Vitale, A;Zoccoli, A;
1999

Abstract

The results of a study of the annihilation reactions anti-n p → ϕ π+ and anti-n p → ω π+ 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 anti-s s quark content in the nucleon offers a fairly plausible explanation for such an effect.
1999
Study of anti-n p → ϕ π+ and anti-n p → ω π+ Annihilation Reactions in Flight / Filippi, A; Agnello, M; Balestra, F; Bergo, D; Botta, E; Bressani, T; Bussa, MP; 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; Semprini Cesari, N; Spighi, R; Vagnoni, V; Vecchi, S; Vigotti, F; Villa, M; Vitale, A; Zoccoli, A; Corradini, M; Donzella, A; Rizzini, EL; Venturelli, L; Zenoni, A; Cicalò, C; Masoni, A; Mauro, S; Puddu, G; Serci, S; Temnikov, P; Usai, G; Gorchakov, OE; Prakhov, SN; Rozhdestvensky, AM; Sapozhnikov, MG; Tretyak, VI; Gianotti, P; Guaraldo, C; Lanaro, A; Lucherini, V; Nichitiu, F; Petrascu, C; Ableev, V; Cavion, C; Gastaldi, U; 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. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 655:3-4(1999), pp. 453-494. [10.1016/S0375-9474(99)00157-8]
Filippi, A; Agnello, M; Balestra, F; Bergo, D; Botta, E; Bressani, T; Bussa, MP; 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; Semprini Cesari, N; Spighi, R; Vagnoni, V; Vecchi, S; Vigotti, F; Villa, M; Vitale, A; Zoccoli, A; Corradini, M; Donzella, A; Rizzini, EL; Venturelli, L; Zenoni, A; Cicalò, C; Masoni, A; Mauro, S; Puddu, G; Serci, S; Temnikov, P; Usai, G; Gorchakov, OE; Prakhov, SN; Rozhdestvensky, AM; Sapozhnikov, MG; Tretyak, VI; Gianotti, P; Guaraldo, C; Lanaro, A; Lucherini, V; Nichitiu, F; Petrascu, C; Ableev, V; Cavion, C; Gastaldi, U; 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
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/954754
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