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Cross sections for resonance production in the reactions π ± p → p π ± π + π − at 16 GeV/ c are determined by a maximum likelihood fit, making use of the measurements of all individual events. The reactions are described by a simple parametrization based on an incoherent superposition of amplitudes for quasi two-body and quasi three-body processes and a non-resonant backgroud. In this way the reflections are accounted for in a consistent way. Thus cross sections are obtained for Δ ++ , Δ 0 , ρ 0 and f 0 production which do not suffer from the uncertainties of background subtraction typical of the usual technique of fitting individual mass distributions.

2 data tables

Table 1

TWO PARTICLE RESONANCE CROSS SECTIONS.

Table 2

CHANNEL FRACTIONS FROM THE FITS. THE AUTHORS WARN AGAINST DERIVING CROSS SECTIONS FOR THREE-PARTICLE RESONANCES.

Interference between (p,f0 ...) and (rho0,b0,...) exchanges in pion diffraction dissociation at 16 gev/c

The Aachen-Berlin-Bonn-CERN-Heidelberg collaboration Beaupre, J.V. ; Deutschmann, M. ; Graessler, H. ; et al.

Phys.Lett.B 41 (1972) 393-396, 1972.

Inspire Record 75614 DOI 10.17182/hepdata.28235

It is found in the reactions π ± p →( π ± π + π − )p, believed to be dominated by diffraction dissociation, that the d σ d t′ distributions show a “cross-over” effect at t ′ ≈ 0.15, similar to the effect observed in elastic scattering. This gives evidence for the interference of ( ϱ 0 , B 0 ,…)-exchanges with ( P , f 0 , …) -exchanges in pion diffraction dissociation reactions. No such evidence is found for baryon dissociation, π ± p → π ± (p π + π − ), at the same energy.

8 data tables

Table 1

No description provided.

Table 2

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Table 3

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Formation of light fragments of oxygen nucleus in O-16 p interactions at momentum 3.1-A/GeV/c

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OBSERVATION OF PARTICLE COLLECTIVE FLUX IN THE COLLISIONS OF 4.1-A-GeV/c Ne-22 WITH Ag, Br EMULSION NUCLEI

The Study of Two-particle Correlations in Inelastic Interactions of Neon-22 Nuclei With Emulsion at 4.1-{GeV}/$c^-$per-nucleon

Cross sections for resonance production in the reaction pi+- p ---> p pi+- pi+ pi- at 16-GeV/c, as obtained by a maximum likelihood fit

Interference between (p,f0 ...) and (rho0,b0,...) exchanges in pion diffraction dissociation at 16 gev/c