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Positive pion photoproduction from hydrogen at photon energies between 500 MeV and 1,400 MeV in forward direction

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Zeitschrift für Physik C Particles and Fields

Abstract

The differential cross section of the reactionγ+p→π + was measured at pion CM-angles of 20° and 30° for photon energies between 500 MeV and 1,400 MeV. The pions were detected in a magnetic spectrometer. By measuring each pion trajectory and by offline calculation of the initial pion parameters an energy resolution of about 2.5% FWHM was achieved. The results complete a set of data which were measured in recent years at the Bonn 2.5 GeV synchrotron. In comparison to photoproduction analyses two effects were revealed: The η cusp appears in the energy dependence of the cross section as a sharp drop atK γ=710 MeV. In the region of the third resonance the data show a greater enhancement than predicted by most of the analyses.

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Authors and Affiliations

  1. Physikalisches Institut der Universität Bonn, Nussallee 12, D-5300, Bonn 1, Federal Republic of Germany

    K. H. Althoff, G. Anton, B. Bock, D. Bour, W. Ferber, H. W. Gelhausen, T. Jahnen, O. Kaul, D. Menze, W. Meyer, T. Miczaika, R. Müller, E. Roderburg, W. Ruhm, E. Schilling, W. J. Schwille, D. Sundermann & K. Wagener

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  1. K. H. Althoff
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  2. G. Anton
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  3. B. Bock
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  4. D. Bour
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  5. W. Ferber
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  6. H. W. Gelhausen
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  7. T. Jahnen
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  8. O. Kaul
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  9. D. Menze
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  10. W. Meyer
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  11. T. Miczaika
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  12. R. Müller
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  13. E. Roderburg
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  14. W. Ruhm
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  15. E. Schilling
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  16. W. J. Schwille
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  17. D. Sundermann
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  18. K. Wagener
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Althoff, K.H., Anton, G., Bock, B. et al. Positive pion photoproduction from hydrogen at photon energies between 500 MeV and 1,400 MeV in forward direction. Z. Phys. C - Particles and Fields 18, 199–205 (1983). https://doi.org/10.1007/BF01571360

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  • DOI: https://doi.org/10.1007/BF01571360

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