We have applied the Estabrooks and Martin analysis to a sample of 5279 events produced in the reactionπ+n ⇒ pρ0, and have made a density matrix study, including a positivity analysis, of theJ = 0, 1, 2density matrix in the f0 region, using a sample of 2385 events.
S-CHANNEL MOMENTS.
T-CHANNEL MOMENTS.
S-CHANNEL FRAME.
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The measurements of the transmission regeneration amplitude on hydrogen in the momentum region of 14–42 GeV/ c indicate that in accordance with the Pomeranchuk theorem its magnitude |ƒ° − ƒ °|/k decreases as energy increases and its phase is approximately constant and equal to arg (ƒ° − ƒ °) = (−118 ± 13)° .
THE REGENERATION AMPLITUDE DECREASES OVER THIS ENERGY RANGE.
Production cross sections for channels involving Ξ + particles (20.9 −3.4 +6.1 ) ub, Ξ − particles (2.3 ± 1.0) ub, Ω + particles (an upper limit of ≲ 1 ub), and other strange particle channels, are given. An Ξ + production mechanism is suggested, in terms of a double-Regge exchange model, not involving exotic trajectories. The values of the Ξ + mass (1321.6 ± 0.8) MeV/ c 2 and lifetime (1.55 ± 0.20 0.35 × 10 −10 sec are in good agreement with those of the Ξ − .
Axis error includes +- 0.0/0.0 contribution (?////SCANNING LOSSES, ERROR IN MB-EQUIVALENT (ABOUT 12.5 PCT), ETC.).
We present a new technique for analyzing multibody states. This analysis makes possible the selection of samples of events that contain only resonances, particle correlations, or phase space. A unique feature of this analysis is that every event in the data is assigned to a particular sample. The three-body final state π++p→p+π++π0 is analyzed as an example.
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A study of the A2+ mass spectrum in π+p interactions at 3.7 GeVc is presented. For a cut of t′=0.1−2.0 GeV2 and on eliminating the Δ++ we find that the three-pion mass spectrum in the A2+ region is fitted by the dipole formula with a confidence level of 53% and a single Breit-Wigner formula with a confidence level of 11%. Our result thus favors A2+ splitting although a single Breit-Wigner fit cannot be ruled out. We also report the A2+ decay branching fractions measured over all t′ values. They are 0.78 ± 0.05, 0.15 ± 0.04, 0.06 ± 0.03, and < 0.02 for ρπ, ηπ, KK¯, and η′π, respectively, in good agreement with other experiments.
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The elastic scattering of 3.6 GeV/ c π + mesons by protons has been studied in a hydrogen bubble chamber experiment. The elastic cross section has a measured value of 7.07 ± 0.20 mb. The forward diffraction peak has been fitted in the region 0.05 ≦ − t ≦ 0.6 (GeV/ c ) 2 by a form (d σ /d t ) = Ae Bt , where A = 46.5 ± 1.8 mb/(GeV/ c ) 2 and B = 6.85 ± 0.20 (GeV/ c ) −2 . From this fit and the optical theorem, the magnitude of the ratio of real to imaginary forward amplitude is 0.39 ± 0.06, in reasonable agreement with dispersion relation calculations and simple Regge model predictions.
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