Experimental Results on Pontecorvo Reactions with Strangeness

Ableev, V.G.; Agnello, M.; Andrighetto, A.; Balestra, F.; Belli, G.; Bendiscioli, G.; Bertin, A.; Bonazzola, G.C.; Botta, E.; Bressani, T.; Bruschi, M.; Bussa, M. P.; Busso, L.; Calvo, D.; Capponi, M.; Cavion, C.; Cereda, B.; Cerello, P.; Cicalò, C.; Corradini, M.; Costa, S.; Castro, S. De; D'Isep, F.; Donzella, A.; Fava, L.; Feliciello, A.; Ferrero, L.; Ferretti, Andrea; Filippi, A.; Filippini, V.; Fontana, A.; Galli, D.; Garfagnini, R.; Gastaldi, U.; Giacobbe, B.; Gianotti, P.; Gortchakov, O.; Grasso, A.; Guaraldo, C.; Iazzi, F.; Lanaro, A.; Rizzini, E. Lodi; Lombardi, M.; Lucherini, V.; Maggiora, A.; Marcello, S.; Marconi, U.; Margagliotti, G. V.; Maron, G.; Masoni, A.; Massa, I.; Minetti, B.; Montagna, P.; Morando, M.; Nichitiu, F.; Panzieri, D.; Parena, D.; Pauli, G.; Petrascu, C.; Piccinini, M.; Piragino, G.; Poli, M.; Prakhov, S.; Puddu, G.; Ricci, R. A.; Rosca, A.; Rossetto, E.; Rotondi, A.; Rozhdestvensky, A.M.; Saino, A.; Salvini, P.; Santi, L.; Sapozhnikov, M. G.; Cesari, Nicola Semprini; Serci, S.; Spighi, R.; Temnikov, P.; Tessaro, S.; Tosello, F.; Tretyak, V.I.; Usai, G. L.; Vannucci, L.; Vecchi, S.; Vedovato, G.; Venturelli, L.; Vezzani, A.; Vitale, A.; Zenoni, A.; Zoccoli, À.; Zosi, G.

doi:10.1007/978-3-7091-9453-9_34

Cited by 3 publications

(4 citation statements)

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“…The experiments performed at LEAR (see [5][6][7][8][9][10][11][12][13][14][15] and references therein) have demonstrated, in agreement with earlier findings [16], that the OZI rule is strongly violated in several channels in pp annihilation at low energy. To explain these results two different theoretical approaches have been used.…”

Section: Introductionsupporting

confidence: 87%

Loop calculations and OZI rule

Markushin

1999

Nuclear Physics A

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The role of two step mechanisms in the OZI rule violation in NN annihilation at low energies is reviewed. The full calculation of two-meson doorway mechanisms shows that the off-mass-shell contributions are important. Moreover, for the φπ 0 and φρ annihilation channels three-meson doorway contributions are non-negligible and improve agreement with the data. A significant enhancement of φ production is found in the resonant rescattering mechanisms pp → π + π − KK → π + π − φ andpp → ηKK → ηφ.

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Section: Introductionsupporting

confidence: 87%

Loop calculations and OZI rule

Markushin

1999

Nuclear Physics A

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“…Of special interest are the processes resulting in the violation of the Okubo-Zweig-Iizuka (OZI) rule [2,3,4]. The recent experiments at LEAR have been very successful in providing the data on this subject [5,6,7,8,9,10,11,12,13,14,15,16,17,18]. A characteristic feature of the low energy pp annihilation is an abundant production of the φ mesons in some channels (φπ, φγ, φρ, φππ, φω, φφ) which is expected to be OZI suppresses on the tree level because the φ is dominantly ass configuration.…”

Section: Introductionmentioning

confidence: 99%

Annihilation into channels with strangeness and the OZI rule violation

Markushin

1997

Nuclear Physics B - Proceedings Supplements

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Two-step mechanisms in the NN annihilation and their role in the OZI rule violating reactions are discussed. In particular the two meson rescattering mechanism for πφ channel including all off-shell effects is typically two orders of magnitude bigger than the OZI tree level expectation and explains the observed ratio φπ/ωπ in the annihilation at rest. The rates for the final states including photons, γω and γφ, can be explained in the vector dominance model. The observed rate for pp → γω is suppressed due to destructive interference between the intermediate ρ and ω states while the interference in pp → γφ is required to be constructive leading to a large ratio γφ/γω.

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“…The production of φ mesons in low energy pp annihilation (see [1,2,3,4,5,6] and references therein) is strongly enhanced in some channels for which the φ production is expected to be suppressed on the tree level according to the Okubo-Zweig-Iizuka (OZI) rule [7,8,9]. These conspicuously OZI rule violating reactions are of considerable theoretical interest since they can be used for studying reaction mechanisms and the nucleon structure, in particular the problem of an intrinsic ss component [10,11,12].…”

Section: Introductionmentioning

confidence: 99%

“…For earlier reviews concerning the two-step mechanisms we refer to [24,25,26,27,28]. 2 The OZI Rule Violation in pp → φπ + π − , φρ, φω Table 1 gives a summary of the experimental data on the OZI rule violation in the φπ + π − and φρ channels at different energies. The tree level expectations based on the deviation of the ω −φ mixing angle from the ideal one are (Θ −Θ i ) 2 ∼ 4 · 10 −3 [34].…”

Section: Introductionmentioning

confidence: 99%