Omega- and Phi-meson production in pn -> dV reactions and OZI-rule violation
msra(1998)
摘要
We investigate the reactions p n -> d omega and p n -> d phi close to
threshold and at higher energies. Near threshold we calculate the S-wave
amplitudes within the framework of the two-step model which is described by a
triangle graph with pi-mesons in the intermediate state and find a ratio of the
S-wave amplitudes squared of R =|A(phi)|^2/|A(omega)|^2 = (4-8) x 10^{-3}. Any
significant enhancement of the experimental value of R(phi/omega) over this
prediction can be interpreted as a possible contribution of the intrinsic s -
anti s component in the nucleon-wave function. We present arguments that there
is a strong resonance effect in the omega N channel close to threshold. At
higher energies we calculate the differential cross sections of the reactions p
n -> d omega, p n -> d phi and the ratio of the phi/omega yields within the
framework of the quark-gluon string model. An irregular behavior of the
phi/omega-ratio is found at s <= 12 GeV^2 due to the interference of the t- and
u-channel contributions.
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关键词
cross section
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