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Photoproduction of two pions in the energy range of 4.1-GeV - 6.2-GeV

The Aachen-Hamburg-Heidelberg-Muenchen collaboration Struczinski, W. ; Dittmann, P. ; Eckardt, V. ; et al.
Nucl.Phys.B 57 (1973) 1-17, 1973.
Inspire Record 84071 DOI 10.17182/hepdata.32562

The reaction γp→; π + π − p in the energy range 4.1 to 6.2 GeV has been studied with a tagged photon beam incident on a liquid hydrogen target in the DESY one-meter streamer chamber. The reaction is analysed in terms of the longitudinal phase space (LPS) method. The one-pion-exchange model for Δ(1236) production and decay is examined. For the diffractive part of the LPS a dual model with pomeron exchange is investigated. In particular, the s -channel helicity conservation dual model of Dewey and Humpert describes the data well.

4 data tables
Table 1

No description provided.

Table 2

CORRECTED FOR LOSSES AT SMALL T (UNLIKE VALUES OF 'REF 1'). BACKGROUND SUBTRACTION ERROR HAS BEEN ADDED QUADRATICALLY TO THE STATISTICAL ERROR.

Table 3

No description provided.

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Properties of the inelastic k+ p reactions between 1.2 and 1.7 gev/c

Berthon, A. ; Montanet, L. ; Paul, E. ; et al.
Nucl.Phys.B 63 (1973) 54-92, 1973.
Inspire Record 83879 DOI 10.17182/hepdata.32479

The observation of 70 000 K 0 p π + events produced with K + incident momenta of 1.21, 1.29, 1.38 and 1.69 GeV/ c allows a detailed description of the production and decay of the Δ(1236) and K ∗ (892) resonances which dominate the K 0 p π + final state. No striking variations with energy are observed. The associated production of Δ and K ∗ near threshold shows striking similarities with the same production at higher energy.

22 data tables
Table 1

INCLUDING 1 PCT SYSTEMATIC ERROR ON CORRECTIONS.

Table 2

FIT 'A', ALLOWING FOR DELTA-K* INTERFERENCE (TWO OTHER FITS GIVEN IN PAPER).

Table 3

S-CHANNEL HELICITY FRAME.

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K n pi final states in k+ p interactions at 7.3 gev/c

Mellema, D.J. ;
Nucl.Phys.B 53 (1973) 429-457, 1973.
Inspire Record 84215 DOI 10.17182/hepdata.32648

Data are presented on the production of the KN π final states in K + p interactions at 7.3 GeV/ c . The energy dependence of the KN π final state cross sections, the effective-mass distributions, and the spectra of c.m. longitudinal momenta are given, and features of these data are compared with predictions of the generalized Veneziano (GV) model. Furthermore, we present the momentum transfer and decay angular distributions for K ∗ (890), K ∗ (1420) and Δ (1236) production within the KN π final states and discuss these quasi-two-body reactions in terms of the GV model.

7 data tables
Table 1

BREIT-WIGNER RESONANCE FITS WITH BACKGROUND CONTRIBUTION.

Table 2

No description provided.

Table 3

No description provided.

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Study of the coherent reaction k+ d ---> k0 pi+ d at 2 gev/c

Firestone, A. ; Hiscock, W. ; Proudfoot, L. ; et al.
Nucl.Phys.B 52 (1973) 403-413, 1973.
Inspire Record 84258 DOI 10.17182/hepdata.32649

We have made a study of the coherent reaction K + d → K 0 π + d at 2 GeV/ c , using data obtained in the Lawrence Berkeley Laboratory 25 inch bubble chamber. The cross section for this reaction is 324 ± 25 μ b, after correction for invisible K 0 decays. This reaction is dominated primarily by vector exchange. We determine the parameters of the ω trajectory to be α ω = (0.33 ± 0.04) + t .

3 data tables
Table 1

No description provided.

Table 2

SLOPE IS 9.4 +- 0.5 GEV**-2 FOR -T > 0.02 GEV**2 AND 10.4 +- 0.6 GEV**-2 FOR -TP > 0.

Table 3

No description provided.


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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Study of the reaction pi+ n ---> omega p at 6.0 gev/c

Anderson, J.C. ; Engler, A. ; Kraemer, R.W. ; et al.
Phys.Lett.B 45 (1973) 165-168, 1973.
Inspire Record 84780 DOI 10.17182/hepdata.28073

An analysis of the reaction π + n→ ω p in a 6.0 GeV/ c bubble chamber experiment is presented. The production differential cross section and spin density matrix elements are compared with Regge exchange models.

3 data tables
Table 1

CORRECTED FOR BACKGROUND.

Table 2

HELICITY FRAME. T-DEPENDENT BACKGROUND SUBTRACTED.

Table 3

TRANSVERSITY FRAME. T-DEPENDENT BACKGROUND SUBTRACTED.


THE REACTION pi+ n ---> p omega AT 13-GeV/c

Paler, K. ; Tebes, J. ; Badewitz, R.C. ; et al.
Lett.Nuovo Cim. 4 (1972) 745, 1972.
Inspire Record 74599 DOI 10.17182/hepdata.37350

None

3 data tables
Table 1

SIMPLE BREIT-WIGNER FIT WITH ESTIMATED BACKGROUND OF 26 +- 8 PCT.

Table 2

MEASURED OFF GRAPH. BACKGROUND NOT SUBTRACTED. NOT CORRECTED FOR SMALL -T PAULI EXCLUSION EFFECTS (NEGLIGIBLE COMPARED WITH STATISTICAL ERRORS).

Table 3

No description provided.


Reaction pi+ p ---> rho+ p at 2.67 gev/c - a study of isoscalar exchanges

Michael, W. ; Gidal, G. ;
Phys.Rev.Lett. 28 (1972) 1475-1479, 1972.
Inspire Record 75483 DOI 10.17182/hepdata.21443

Results are presented of a study of the reaction π+p→ρ+p at 2.67 GeV/c incident π+ momentum. The contributions due to given spin-parity exchanges are isolated; and, by combining these results with those of a similar π− experiment, the It=0 component of each series is separated. The ω (I=0, JPG=1−−) exchange contribution shows a pronounced dip at −t=0.4 (GeV/c)2. Evidence is presented for the exchange of a state of minimum quantum numbers, H (I=0, JPG=1+−).

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Elastic scattering and single-pion production in k- p interactions at 5.5 gev/c

Engelmann, R. ; Musgrave, B. ; Schweingruber, F. ; et al.
Phys.Rev.D 5 (1972) 2162-2187, 1972.
Inspire Record 74221 DOI 10.17182/hepdata.22545

We present results of an analysis of two-prong events for elastic scattering and single-pion production in K−p interactions at 5.5 GeVc. The resonance parameters for the charged and neutral K*(890) and K*(1420) are determined and the observed production and decay properties of the charged and neutral K*(890) are compared with the theoretical predictions of an absorptive one-particle-exchange model and a Regge model. The K*(1420) differential cross section and density-matrix elements are presented and the question of whether more than one resonance exists in this mass range is considered. A search for resonance effects at Kπ mass beyond 1500 MeV is made. In particular, the recently reported state at 1800 MeV is discussed. A B5-model analysis of the reaction K−p→K¯0π−p is also presented.

13 data tables
Table 1

NORMALIZED TO SIG(K- P --> ANYTHING) OF 24.3 +- 0.8 MB.

Table 2

FORWARD CROSS SECTION OPTICAL POINT FROM TWO PARAMETER EXPONENTIAL FIT OVER 0.12 < -T < 0.68 GEV**2.

Table 3

No description provided.

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K0(s) k- decay of a2- produced by 20.3-gev/c pi- on hydrogen

Foley, K.J. ; Love, W.A. ; Ozaki, S. ; et al.
Phys.Rev.D 6 (1972) 747-756, 1972.
Inspire Record 73969 DOI 10.17182/hepdata.22252

We present the results of an analysis of data for the reaction π−p→KS0K−p at 20.3-GeV/c incident π momentum. We find that the K0K− effective-mass spectrum shows a single peak in the A2 region which is well fitted by a Breit-Wigner shape. The data in the A2-peak region are inconsistent with the split-A2 shape reported earlier. The distribution in t of the A2 events shows a forward dip followed by an exponential falloff. The A2 decay angular distribution is well fitted by a single resonance with quantum numbers JP=2+. The results of an analysis of the density-matrix elements for this reaction are given.

2 data tables
Table 1

CORRECTED FOR UNSEEN K0 DECAYS AND FOR BREIT-WIGNER RESONANCE TAILS.

Table 2

INCLUDING THE DENSITY MATRIX ELEMENTS OMITTED FROM THIS FIT GIVES NO SIGNIFICANT IMPROVEMENT AND THE NEW PARAMETERS ARE CLOSE TO ZERO. LIM INDICATES FITTED VALUE LIMITED FROM VARIATION BY PHYSICAL CONSTRAINTS FROM OTHER PARAMETERS.