[en] Λ⁰ polarization from pp → p_diffractedΛ⁰K⁺at 800 GeV/c in the average depends linearly on Λ⁰K⁺ invariant mass: Λ⁰ polarization is 0.635 ± 0.036 at 1.64 GeV, consistent with zero at ∼ 2.195 GeV, and -0.586 ± 0.072 at 3.200 GeV. The origin of this ^Λ0 polarization is, probably, the interference of at least two Λ⁰K⁺ resonances, created from the excitation of the target proton, due to the diffracted proton transferred momentum

[en] Results are presented from a partial wave analysis of a sample of centrally produced mesons in the reaction pp→p_slow(K_sK_s)p_fast, with 800 GeV/c protons incident on a liquid hydrogen target. The meson system is found to be predominantly S-wave in the mass range between K_sK_s threshold and 1.58 GeV/c². The f₀(1500) is clearly observed in this region. Above 1.58 GeV/c² two solutions are possible, one with mainly S-wave and another with mainly D-wave. This ambiguity prevents a unique determination of the spin of the f_J(1710) meson. copyright 1998 American Institute of Physics

[en] Partial wave analysis results of centrally produced mesons in the reaction pp→p_slow(X)p_fast, with 800 GeV/c protons incident on a liquid hydrogen target are presented. In the reactions considered in this paper the (X) system decays into: a) K_a⁰K^±π^minus-plus, b) K_sK_s, and c) π⁺π^-. copyright 1998 American Institute of Physics

[en] Results are presented from an analysis of a large sample of centrally produced mesons in the reaction pp→p_slow(K⁰_S K^±π^minus-plus)p_fast with 800 GeV/c protons incident on liquid hydrogen. Two resonances dominate the final state, the f₁(1285) , decaying into a₀π , and the f₁(1420) , decaying into K^*K . Both mesons are produced with equal amounts of |J_z|^η=1^± , and no J_z=0 . copyright 1999 The American Physical Society

[en] Results are presented from a partial wave analysis of a sample of centrally produced mesons in the reaction pp→p_slow(K_SK_S )p_fast , with 800 GeV/c protons incident on a liquid hydrogen target. The meson system is found to be predominantly S wave in the mass range between K_SK_S threshold and 1.55 GeV/c² . The f₀(1500) is observed in this region. Above 1.55 GeV/c² two solutions are possible, one with mainly S wave and another with mainly D wave. This ambiguity prevents a unique determination of the spin of the f_J(1710) meson. copyright 1998 The American Physical Society

[en] Partial wave analysis results of centrally produced mesons in the reaction pp→p_slow(X)p_fast, with 800 GeV/c protons incident on a liquid hydrogen target are presented. In the reactions considered in this paper the (X) system decays into: a) K_a⁰K^±π^±, b) K_sK_s, and c) π⁺π^-

[en] Results are presented from a partial wave analysis of a sample of centrally produced mesons in the reaction pp→p_slow(K_sK_s)p_fast, with 800 GeV/c protons incident on a liquid hydrogen target. The meson system is found to be predominantly S-wave in the mass range between K_sK_s threshold and 1.58 GeV/c². The f₀(1500) is clearly observed in this region. Above 1.58 GeV/c² two solutions are possible, one with mainly S-wave and another with mainly D-wave. This ambiguity prevents a unique determination of the spin of the f_J(1710) meson

[en] We have measured the quantum numbers J^PG of the K_sK^±π^minus-plus system produced in the diffraction dissociation process pp→p_f(K⁰_sK^±π^minus-plus)p_s at 800 GeV/c. We observe two clear peaks at 1282±0.6 MeV/c², Γ=25±0.5 MeV/c² and 1432±0.6 MeV/c², Γ=51±0.9 MeV/c². A partial wave analysis shows that the resonances we observe have J^PG=1⁺⁺a₀π for the first peak, and J^PG=1⁺⁺K*K for the second peak. Thus, they can be identified as the f₁(1285) and f₁(1420), respectively. No evidence for a signal at ≅1510 MeV/c² is obtained. copyright 1996 American Institute of Physics

[en] We determined Λ⁰ polarization as function of X_F, P_T, M_X, and E_Λ, with respect to the normal of the following two different production planes: The first one defined by the momentum of the 800 GeV/c proton beam and the moment of Λ⁰; the second one, by the momentum of the transferred object and the momentum of Λ⁰, from the sample created in the FNAL E690 experiment. We present results, compare and discuss them

[en] We report results from a study of Λ⁰ polarization in the exclusive reaction pp→p_f(Λ⁰K⁺ ) at 800-GeV/c . We observe a dependence of the polarization on the Λ⁰K⁺ invariant mass with large (+71%) positive polarization at small mass (1.63-GeV/c² ) and large (-43%) negative polarization at large mass (2.75-GeV/c² ) . This observation confirms the result of the CERN ISR R608 experiment and extends the range over which the effect is observed. The strong dependence of the polarization on the Λ⁰K⁺ invariant mass suggests that the origin of the polarization is closely related to the production dynamics of the diffractively produced Λ⁰K⁺ system