In an experiment at the CERN intersecting storage rings with √ s = 31 GeV, we have measured αP , the product of asymmetry parameter and polarization, for Λ 0 's and Λ 0 's produced in p p and pp interactions, respectively. The ratio, (αP) Λ /(αP Λ = −1.04±0.29 , is consistent with the value −1, and constitutes the first test of CP invariance in Λ decay.
The ratio CONST/CONST is obtained under assumption of POL(LAMBDA) = POL(LAMBDABAR).
We report results of an inclusive measurement of the charmed baryon, Λ c , in the forward direction of proton-proton interactions with s =63 GeV . The signal, seen in the final state Λ s π + π + π − , has 6.0 σ significance with about 620 events on a large background and corresponds to a cross section times branching ratio of 2.84±0.50±0.72 μ b for Feynman- x F > 0.5 in both hemispheres. Asymmetries are observed in the decay angular distributions which are characteristic of weak decays and have a combined 3.0 σ significance.
BR. RATIO WAS TAKEN TO BE 0.028+-0.007+-0.011.
We report Λ 0 -hyperon polarization measurements at the CERN intersecting storage rings from √ s of 31 to 62 GeV. P Λ 0 changes insignificantly, +(0.8±1.7)%, over this range of √ s . However, P Λ 0 is observed to grow with Feynman- x F and with transverse momentum. At an average p t of 1.1 GeV/ c , P Λ 0 depends linearly on x F and approaches −40% at x F =0.8.
No description provided.
We study the production of π + 's and protons at 90° with p t>1.15 GeV and their correlations with forward protons. Fewer forward protons are observed for a 90° proton trigger than for a π + trigger. This is in qualitative agreement with the idea of an effective diquark scattering mechanism. Additionally, we observe that a K + produced at 90° is correlated with an enhanced forward production of λ O .
No description provided.