Date

Pi- p ELASTIC SCATTERING IN THE CMS ENERGY RANGE 1400-MeV TO 2000-MeV

Brody, A.D. ; Cashmore, R.J. ; Kernan, A. ; et al.
Phys.Rev.D 3 (1971) 2619, 1971.
Inspire Record 60976 DOI 10.17182/hepdata.4110

Total and differential cross sections for π−p elastic scattering are presented at 35 energies between 1400 and 2000 MeV.

70 data tables

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Measurement of the polarization parameter in backward pi+ p elastic scattering at 1.60, 1.80, 2.11, and 2.31 gev/c

Burleson, G. ; Hill, D. ; Kato, S. ; et al.
Phys.Rev.Lett. 26 (1971) 338-340, 1971.
Inspire Record 69051 DOI 10.17182/hepdata.21558

Measurements of polarization in π+p elastic scattering have been made at 1.60, 1.80, 2.11, and 2.31 GeVc. The data cover the entire angular range, with emphasis on the backward region. Comparisons have been made with both u-channel and t-channel models, as well as with predictions of phase-shift analyses. While the agreement is generally poor in all cases, the best agreement is with some t-channel predictions.

4 data tables

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Measurements of polarization in pi- p elastic scattering at large angles

Hill, D. ; Koehler, P.F.M. ; Novey, T.B. ; et al.
Phys.Rev.Lett. 27 (1971) 1241-1243, 1971.
Inspire Record 68894 DOI 10.17182/hepdata.229

We have made measurements of polarization in π−p elastic scattering, with emphasis over the backward region, at 1.60 to 2.28 GeVc. The results indicate the absence of u-channel dominance in the backward region, as was observed in the case of π+p scattering. Comparisons have been made with predictions of various phase-shift analyses which show that the agreement is generally very poor in the backward region.

9 data tables

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PHOTOPRODUCTION OF pi0 FROM NEUTRONS AT 4-Gev

Bolon, G.C. ; Bellenger, D. ; Lobar, W. ; et al.
Phys.Rev.Lett. 27 (1971) 964, 1971.
Inspire Record 67576 DOI 10.17182/hepdata.29303

We have measured the reaction γ+n→π0+n at a photon energy of 4 GeV for 0.2<~−t<~1.8(GeVc)2. The cross section is slightly less than that with protons as a target.

1 data table

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Proton proton total cross-sections between 179 and 555 mev

Schwaller, P. ; Pepin, M. ; Measday, David F. ; et al.
Phys.Lett.B 35 (1971) 243-246, 1971.
Inspire Record 69250 DOI 10.17182/hepdata.28479

Proton-proton total cross-sections have been measured at nine different energies between 179 and 555 MeV (607 and 1162 MeV/ c ) with a typical accuracy of 0.9%. The accuracy is limited by a poor knowledge of the Coulomb-nuclear interference region in elastic scattering.

1 data table

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Measurement of the polarization parameter in k+ p elastic scattering at 1.60, 1.80, 2.11 and 2.31 gev/c

Barnett, B.A. ; Laasanen, A.T. ; Steinberg, P.H. ; et al.
Phys.Lett.B 34 (1971) 655-658, 1971.
Inspire Record 69281 DOI 10.17182/hepdata.28513

The polarization parameter for K + p elastic scattering has been measured at 1.60, 1.80, 2.11 and 3.31 GeV/ c incident momenta over the entire angular range with an emphasis on the backward region. The results in the extreme backward region appear to be small and consistent with zero.

1 data table

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PRODUCTION OF B (1235) AND rho (1710) 4 pi ENHANCEMENTS IN 16-GeV/c pi+- p COLLISIONS

Ballam, Joseph ; Chadwick, G.B. ; Guiragossian, Zaven G.T. ; et al.
Phys.Rev.D 3 (1971) 2606, 1971.
Inspire Record 67113 DOI 10.17182/hepdata.23670

Production of B(1235) and ρ(1710) mesons is observed in the four-pion decay modes π+π+π−π0 in 16−GeVc π±p collisions. Decay distributions and branching fractions into various modes are presented. Absence of the two-pion mode π−π0 for the ρ(1710) is noted.

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THE REACTION K0(L) p ---> K0(S) p FROM 1.3-GeV/c TO 8.0-GeV/c

Brody, A.D. ; Johnson, William B. ; Kehoe, B. ; et al.
Phys.Rev.Lett. 26 (1971) 1050, 1971.
Inspire Record 67120 DOI 10.17182/hepdata.21557

Total and differential cross sections are presented for the reaction KL 0p→KS 0p from 1.3 to 8.0 GeVc as measured in an exposure of the Stanford Linear Accelerator Center 40-in. hydrogen bubble chamber to a neutral beam. The forward points of dσ(KL 0p→KS 0p)dt together with K+n and K−n total cross sections are used to determine the intercept of the effective Regge trajectory, α(0)=0.47±0.09, and the regeneration phase ϕf=−43∘±8∘.

7 data tables

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VAN HOVE ANALYSIS OF THE REACTIONS pi- p ---> pi- pi- pi+ p AND pi+ p ---> pi+ pi+ pi- p AT 16-GeV/c

Ballam, Joseph ; Chadwick, G.B. ; Guiragossian, Zaven G.T. ; et al.
Phys.Rev.D 4 (1971) 1946, 1971.
Inspire Record 67149 DOI 10.17182/hepdata.23179

Data from the reactions π−p→π−π−π+p and π+p→π+π+π−p have been obtained at 16 GeV/c in approximately equal samples from the BNL 80-in. hydrogen bubble chamber. We have studied both reactions for resonance production and compared our results with predictions of the one-pion-exchange model (OPEM) calculated by Wolf. The four-body longitudinal phase-space (LPS) plot suggested by Van Hove was used to analyze the data from both reactions. The events were separated according to distinct regions of the LPS plot in order to study the following classes of quasi-two-body final states: (1) diffractively produced three-pion states, (2) diffractively produced ππp states, (3) double-resonance production such as ρ0Δ++, (4) single-resonance production such as π−π−Δ++. The Van Hove analysis provided a much cleaner separation of resonances from background effects than the usual techniques. We observe production of the A1 and A2 mesons as well as the N*(1470) and N*(1700) isobars in the π+π−p system for both reactions. There is strong formation of the doubly resonant states ρ0Δ++ and f0Δ++ and the general features of the nondiffractive events are all in good agreement with one-pion exchange. Detailed comparisons between the data and the OPEM in each LPS plot region show that Van Hove analysis provides a sensitive test for the OPE model.

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DEDUCED FROM PRONG CROSS SECTIONS NORMALIZED USING THE DATA OF K. J. FOLEY ET AL., PRL 19, 330 (1967).

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STUDY OF DELTA++ PRODUCTION IN THE REACTION pi+ p ---> pi+ pi0 p AT 13.1-GeV/c

Scharenguivel, J.H. ; Gutay, L.J. ; Gaidos, J.A. ; et al.
Nucl.Phys.B 36 (1972) 363-372, 1972.
Inspire Record 67685 DOI 10.17182/hepdata.33005

We have measured the production and decay angular distributions of the reaction π + p→ π O Δ ++ at 13.1 GeV/ c incident momentum. For − t > 0.1 (GeV/ c ) 2 the data is well described by M1 ϱ-exchange models, the best results being obtained from a weak cut model with a wrong signature nonsense zero. For − t < 0.1 (GeV/c) 2 there is evidence for the existence of other exchange mechanisms.

5 data tables

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