Exclusive production of the isoscalar vector mesons Ï and Ï is measured with a 190Â GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass MpV of the system formed by fast proton pfast and vector meson V is discussed in terms of diffractive production of pfastV resonances in competition with central production. The measurement of the spin density matrix element Ï00 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xF and on MpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to Ï production which are absent in the case of the Ï meson. Removing the low-mass MpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xF .
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"title": "Spin alignment and violation of the OZI rule in exclusive \u03c9 and \u03d5 production in pp collisions"
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"value": "Exclusive production of the isoscalar vector mesons \u00cf\u0089 and \u00cf\u0095 is measured with a 190\u00c2 GeV/c proton beam impinging on a liquid hydrogen target. Cross section ratios are determined in three intervals of the Feynman variable xF of the fast proton. A significant violation of the OZI rule is found, confirming earlier findings. Its kinematic dependence on xF and on the invariant mass MpV of the system formed by fast proton pfast and vector meson V is discussed in terms of diffractive production of pfastV resonances in competition with central production. The measurement of the spin density matrix element \u00cf\u008100 of the vector mesons in different selected reference frames provides another handle to distinguish the contributions of these two major reaction types. Again, dependences of the alignment on xF and on MpV are found. Most of the observations can be traced back to the existence of several excited baryon states contributing to \u00cf\u0089 production which are absent in the case of the \u00cf\u0095 meson. Removing the low-mass MpV resonant region, the OZI rule is found to be violated by a factor of eight, independently of xF ."
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