OZI rule and instantons
نویسندگان
چکیده
منابع مشابه
Loop Calculations and OZI Rule
The role of two step mechanisms in the OZI rule violation in NN̄ 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 φπ0 and φρ annihilation channels three-meson doorway contributions are non-negligible and improve agreement with the data. A significant enhancement of φ product...
متن کاملAnnihilation into Channels with Strangeness and the OZI Rule Violation1
Two-step mechanisms in the NN̄ 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 ph...
متن کاملNucleon Vector Strangeness Form Factors : Multi - pion Continuum and the OZI Rule
We estimate the 3π continuum contribution to the nucleon strange quark vector current form factors, including the effect of 3π ↔ ρπ and 3π ↔ ω resonances. We find the magnitude of this contribution to be comparable to that the lightest strange intermediate states. We also study the isoscalar electromagnetic form factors, and find that the presence of a ρπ resonance in the multi-pion continuum m...
متن کاملHigher Order Two Step Mechanisms in Nucleon Antinucleon Annihilation and the OZI Rule
We evaluate three meson doorway mechanisms for nucleon-antinucleon annihilation at rest for the first time. Detailed results are presented for the final state φπ 0 originating from the 3 S 1 initial state and for the φρ channel originating from 1 S 0. The results presented also include the improved contributions from two meson doorway states and from the tree diagrams. For all the channels cons...
متن کاملInstanton Effects in N ¯ N Annihilation
It is shown that specific spin-flavour properties of the nonperturbative interaction between quarks induced by instantons allow us to explain the peculiarities of the OZI rule violation in N ¯ N annihilation. New experiments to test the instanton mechanism of the OZI rule violation are proposed.
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1989
ISSN: 0370-2693
DOI: 10.1016/0370-2693(89)91215-x