Abstract
The ϱ0 meson spin alignment is studied inclusively in all inelastic and in some nonannihilation channels of pp interactions at 22.4 and 12 GeV/c, in the reaction pp → 2π+ 2π− + neutrals at 5.7 GeV/c and in pp interactions at 24 GeV/c. Its dependence on multiplicity, the ϱ0 meson transverse momentum p⊥ and the Feynman variable x is investigated. The method of the inclusive analysis is checked with the help of Monte Carlo events. An essential ϱ0 meson spin alignment, manifesting itself most clearly in the transversity frame, is observed in pp interactions; the values of the probability ϱ00T of the zero ϱ0 spin projection on the normal to the production plane are 0.51 ± 0.06, 0.53 ± 0.04 and 0.55 ± 0.04 for the above pp reactions, respectively. A significant increase of ϱ00T with p⊥ and only a weak dependence of ϱ00T on x are obtained for pp data at 5.7 and 12 GeV/c. The ϱ meson spin alignment is also observed in pp nonannihilation channels at 12 GeV/c (ϱ00T = 0.65 ± 0.12) while no substantial effect is seen in pp interactions (ϱ00T ≈ 13in any frame). The results are compared with other polarization data and discussed in terms of Regge phenomenology and a quark-parton model incorporating spin-orbit interaction with the confining field.
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