Lawson, E.M.
GAMMA P --> PI+ N
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Photoproduction of $\pi^+$ Mesons from Protons at $E_\gamma = 230$ MeV and Determination of the $\gamma\pi\rho$ coupling Constant

Aleksandrov, Yu.M. ; Grushin, V.F. ; Zapevalov, V.A. ; et al.
Zh.Eksp.Teor.Fiz. 49 (1965) 54-65, 1965.
Inspire Record 1387583 DOI 10.17182/hepdata.71192

The differential cross section for photoproduction of 1r + mesons from protons at an energy Ey = 230 MeV has been measured for center-of-mass angles of 0, 38, 82, 90, 116, 138, 146, and 180°. A magnetic spectrometer and a meson-stopping detector were used to identify mesons from momentum and range. stopped 1r+ mesons were detected by means of the 1r- p. decay. The statistical accuracy of the results is ±(3-4)% on the average. From comparison of the experimental data with theoretical calculations based on dispersion relations, we have estimated the value of the y1rp coupling constant, Ay1rp = (0.63 ± O.ll)ef.

2 data tables
Table 1

No description provided.

Table 2

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Measurement of Asymmetry of Photoproduction of Positive Pions on Protons by Linearly Polarized Photons in 250-MeV-500-MeV Energy Range

Ganenko, V.B. ; Gorbenko, V.G. ; Derkach, L.M. ; et al.
Yad.Fiz. 23 (1976) 100-106, 1976.
Inspire Record 113097 DOI 10.17182/hepdata.19093

None

12 data tables
Table 1

No description provided.

Table 2

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Table 3

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Photoproduction of positive pions on protons in the region of resonance p-33(1236)

Aleksandrov, Yu.M. ; Grushin, V.F. ; Leikin, E.M. ; et al.
Yad.Fiz. 12 (1970) 770-781, 1970.
Inspire Record 63291 DOI 10.17182/hepdata.29553

None

1 data table
Table 1

No description provided.


PI+ PHOTOPRODUCTION AT CONSTANT PION ENERGY, AND THE (GAMMA PI RHO) COUPLING

Leith, David W.G.S. ; Little, R. ; Lawson, E.M. ;
Phys.Lett. 8 (1964) 355-357, 1964.
Inspire Record 8509 DOI 10.17182/hepdata.27375

None

1 data table
Table 1

No description provided.


THE ANGULAR DISTRIBUTION OF THE PHOTOPRODUCTION OF POSITIVE PIONS FROM HYDROGEN BY 187-MeV GAMMA RAYS

Lewis, G.M. ; Leith, David W.G.S. ; Thomas, D.L. ; et al.
Nuovo Cim. 27 (1963) 384, 1963.
Inspire Record 8502 DOI 10.17182/hepdata.37716

The differential cross-section for π+ photoproduction from hydrogen by γ-rays of laboratory energy 187 MeV has been measured at four angles. Two identical counter systems, designed to detect low energy pions unambiguosly in intense electron and γ-ray backgrounds, were used in conjunction with a cylindrical liquid hydrogen target, of very low boil-off rate. The cross-sections at laboratory angles of 39.2°, 66.7°, 111.6°, and 134° are 7.49±0.47, 8.10±0.57, 8.36±0.61 and 9.54±0.61, ·10−30cm2/sr, respectively, where the assigned errors refer only to the relative values. The absolute cross-sections are in substantial agreement with the dispersion theory and confirm the front to back asymmetry.

1 data table
Table 1

No description provided.