HEPData Search

Measurements have been made of the asymmetry in the scattering of π− mesons by a polarized proton target. Scattered π mesons and recoil protons were detected in arrays of scintillation counters; data were obtained at 16 scattering angles at each of 8 beam momenta between 875 and 1578 MeV/c. Analysis of these data together with earlier differential-cross-section measurements shows that there must exist at least three resonances in this energy region: (i) mass 1920 MeV/c2, Γ=170 MeV/c2, I=32, F72; (ii) mass 1682 MeV/c2, Γ=100 MeV/c2, I=12, F52; and (iii) mass 1674 MeV/c2, Γ=100 MeV/c2, I=12, D52.

33 data tables

Table 1

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The Real Part of the Forward Scattering Amplitude in pi+- p Elastic Scattering Below 2-GeV/c

Baillon, P. ; Bricman, C. ; Eberhard, P. ; et al.

Phys.Lett.B 50 (1974) 387-390, 1974.

Inspire Record 89683 DOI 10.17182/hepdata.27947

The differential cross section for π ± p elastic scattering below 2 GeV/ c has been measured at small forward pion angles by an electronics experiment. The interference effects observed between the Coulomb and the nuclear interaction have been used to determine the magnitude and sign of the real parts of the π ± p forward scattering amplitude. The latter are compared to the values predicted by the dispersion relations.

7 data tables

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Electroproduction of $\pi^0$ Mesons in the Resonance Region at $q^2=1.0$-{GeV}/$c^2$

Latham, A. ; Allison, John ; Booth, I. ; et al.

Nucl.Phys.B 189 (1981) 1-14, 1981.

Inspire Record 155783 DOI 10.17182/hepdata.43833

Data are presented for the reaction ep → ep π 0 at a nominal momentum transfer squared of 1.0 (GeV/ c ) 2 . The data were obtained using an extracted electron beam from NINA and two magnetic spectrometers for coincidence detection of the electron and proton. Differential cross sections have been measured for isobar masses in the range 1.19–1.73 GeV/ c 2 .

22 data tables

Table 1

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The Photoproduction of Neutral Pions from Protons Between 0.7-GeV and 1.7-GeV

Barton, J.S. ; Booth, P.S.L. ; Carroll, L.J. ; et al.

Nucl.Phys.B 84 (1975) 449-466, 1975.

Inspire Record 90496 DOI 10.17182/hepdata.32128

Measurements of differential cross sections for pi-zero photoproduction from protons have been made at angles between 60° and 140° c.m. in the photon energy range 0.7 GeV to 1.7 GeV. The data are compared with the rits provided by three recent partial-wave analyses of pion photoproduction and some significant discrepancies observed.

9 data tables

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The Photoproduction of Neutral Pions from Protons at Forward Angles in the Resonance Region

Booth, P.S.L. ; Carroll, L.J. ; Holt, J.R. ; et al.

Nucl.Phys.B 84 (1975) 437-448, 1975.

Inspire Record 90412 DOI 10.17182/hepdata.32127

Differential cross sections for the photoproduction of pi-zero mesons from protons have been measured at angles between 10° and 70° c.m. in the energy range 0.85 GeV to 1.30 GeV. The values are compared with the fits to pion photoproduction data from three recent partial-wave analyses.

1 data table

Table 1

ELECTROPRODUCTION OF SINGLE CHARGED PIONS FROM DEUTERIUM AT Q2 APPROXIMATELY 1-GEV2 IN THE RESONANCE REGION

Vapenikova, O. ; Allison, John ; Dickinson, B. ; et al.

Z.Phys.C 37 (1988) 251-258, 1988.

Inspire Record 263398 DOI 10.17182/hepdata.898

We present differential cross-sections for the electro-production of single charged pions from deuterium for a virtual photon mass squared −1.0 GeV2 and for pion nucleon masses in the range 1.23–1.68 GeV (the 1st and 2nd resonance regions). The data are compared with predictions from fits to hydrogen data.

30 data tables

Table 1

FORWARD BINS.

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