Okubo-Zweig-Iizuka Rule Violation and Possible Explanations
نویسنده
چکیده
Violations of the Okubo-Zweig-Iizuka (OZI) rule in ss̄ ↔ nn̄≡ 1 √ 2 (uū+dd̄) mixing and φ production from NN̄ annihilation are reviewed. Possible explanations are examined. We conclude that the two-step hadronic loops can explain these OZI violations naturally with proper consideration of cancellations between loops. No conclusive evidence exists for glueball states, ss̄nn̄ four quark states, instanton effects, and strange quarks in nucleon.
منابع مشابه
A study of the Okubo - Zweig - Iizuka rule violations in η c → V
We discuss the Okubo-Zweig-Iizuka (OZI) rule violation effects in ηc → V V in light of the new data from BES Collaboration. In particular, a possible non-vanishing branching ratio for ηc → ωφ provides a hint of the degrees of OZI violations based on a recent factorization proposed for charmonium hadronic decays. The violation mechanism is studied via an intermediate meson exchange model. The re...
متن کاملPolarized strangeness in the nucleon
A large violation of the Okubo-Zweig-Iizuka rule was discovered in the annihilation of stopped antiprotons. The explanation of these experimental data is discussed in the framework of the model assumed that the nucleon strange sea quarks are polarized.
متن کاملThe reactions pn → dω and pn → dφ near threshold
The reactions pn → dω and pn → dφ are studied within a relativistic meson-exchange model of hadronic interactions. Predictions for the total cross sections and for the angular distributions of the vector mesons are presented. The resulting cross sections near threshold are around 10-30 µb for pn → dω and 200-250 nb for pn → dφ. A moderate deviation of the cross section ratio σ pn→dφ /σ pn→dω fr...
متن کاملHadronic Probes of the Polarized Intrinsic Strangeness of the Nucleon
We have previously interpreted the various large apparent violations of the näıve Okubo-Zweig-Iizuka (OZI) rule found in many channels in p̄p annihilation at LEAR as evidence for an intrinsic polarized s̄s component of the nucleon wave function. The model is further supported by new data from LEAR and elsewhere. Here we discuss in more detail the possible form of the s̄s component of the nucleon w...
متن کاملAsymmetries in φ photoproduction and the Okubo - Zweig - Iizuka violation
We study the vector meson density matrix and the associated polarization asymmetries in φ photoproduction near threshold. In order to study the OZI violating processes, we consider the direct φNN coupling as well as the knockout processes arising from the non-vanishing ss̄ sea quarks in the nucleon. The polarization asymmetries in φ meson decays are found to be very useful to constrain the φNN c...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996