Dehm, G.
Exclusive
STEN.STEN
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Test of quark model predictions in the reactions $\pi^+ p \to \omega \Delta^{++}$ and $\rho^0\Delta^{++}$ at 5 GeV/c

Lyons, L. ; Karshon, U. ; Eisenberg, Y. ; et al.
Nucl.Phys.B 85 (1975) 165-178, 1975.
Inspire Record 1392677 DOI 10.17182/hepdata.32120

The well-known class-A quark-model relations of Białas and Zalewski are parametrised in a particular form, where one can compare the data with the predictions separately for the meson non-flip and flip parts, defined in the transversity frame. A 3-parameter fit to the joint decay angular distribution is performed on the experimental data, and the results are compared with the quark-model predictions for various regions of the four-momentum transfer. The effect of an s -wave state under the ρ 0 is discussed.

1 data table
Table 1

A THREE PARAMETER FIT IS MADE TO THE JOINT DECAY DISTRIBUTION.


Study of k*0(892) delta++(1236) production from k+ p interactions at 3 gev/c

Buchner, K. ; Dehm, G. ; Goebel, G. ; et al.
Nucl.Phys.B 29 (1971) 381-397, 1971.
Inspire Record 68636 DOI 10.17182/hepdata.33527

The reaction K + p → K ∗o (892) Δ ++ (1236) has been studied at 3 GeV/ c in both a hydrogen and a deuterium bubble chamber experiment. The production mechanism is described by a Regge-type model using π- and B-exchange. The joint decay distributions are analysed in various frames and compared with quark-model predictions.

19 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The reaction pi+ p ---> omega delta++(1236) at 11.7 gev/c

Evans, D. ; Maddock, R.O. ; Pinter, G.F. ; et al.
Nucl.Phys.B 51 (1973) 205-220, 1973.
Inspire Record 84297 DOI 10.17182/hepdata.32709

For the reaction π + p → ωΔ ++ data on the total cross section ( σ = 61 ± 12 μ b), differential cross sections, spin density matrix elements and statistical tensor elements are given. We observe natural and unnatural parity exchange contributions to the total cross section. We note that the value of ϱ 00 is not zero and in the helicity frame exhibits a dip at t ≈ −0.25 (GeV/ c ) 2 . A qualitative theoretical discussion of our results is presented.

9 data tables
Table 1

CORRECTED FOR BACKGROUND, RESONANCE TAILS AND UNSEEN OMEGA DECAY MODES.

Table 2

NORMALIZED TO THE TOTAL CROSS SECTION. SOME BACKGROUND IS PRESENT.

Table 3

NORMALIZED TO THE TOTAL CROSS SECTION. SOME BACKGROUND IS PRESENT.

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A Study of the Reactions pi+ p --> (rho0, omega) Delta++ at 13-GeV/c

Gaidos, J.A. ; Hirata, A.A. ; DeBonte, R.J. ; et al.
Nucl.Phys.B 72 (1974) 253-282, 1974.
Inspire Record 763 DOI 10.17182/hepdata.32316

Cross sections, differential cross sections, density matrix elements and statistical tensors are given for the reactions π + p → ( ϱ 0 , ω ) Δ ++ at 13.2 GeV/ c . A discussion of the results in terms of particle exchanges, quark model or dipole coupling constraints, and the equal phase hypothesis is presented in some detail for the high statistics ϱ 0 Δ ++ channel.

10 data tables
Table 1

BREIT-WIGNER FITS WHICH CORRECT FOR RESONANCE TAILS AND BACKGROUNDS.

Table 2

No description provided.

Table 3

JACKSON FRAME DENSITY MATRIX ELEMENTS.

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Study of the Reaction anti-p p --> anti-Delta++ Delta++ at 9.1-GeV/c

Walck, C. ; Carlsson, R. ; Ekspong, G. ; et al.
Nucl.Phys.B 100 (1975) 61-73, 1975.
Inspire Record 104375 DOI 10.17182/hepdata.36103

Single and joint decay angular distributions in the reaction p p → Δ ++ Δ ++ at 9.13 GeV/ c are discussed in the framework of single and double statistical tensors. The t dependence of 12 double statistical tensors is presented. Cross sections for p p → p p π + π − and p p → Δ ++ Δ ++ are determined to be 2.60 ± 0.10 and 0.90 ± 0.10 mb respectively. The results obtained are compared with other experiments mainly at 5.7 and 12 GeV/ c .

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

FROM FITTING DECAY ANGULAR DISTRIBUTIONS OF BOTH ISOBARS ADDED.

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