Photoproduction of π+ mesons on polarized protons |
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| Authors: | H Genzel P Heide J Knütel H Lierl K-H Mess M-J Schachter P Schmüser B Sonne G Vogel |
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| Institution: | 1. Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany;2. II. Institut für Experimentalphysik, Universität Hamburg Max-Planck-Institut für Physik und Astrophysik, München, Germany |
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| Abstract: | The asymmetry of the cross sections for the photoproduction of π+ mesons on polarized protons γ + p↑ → π+ + n has been studied in the four-momentum transfer range 0.1 ? |t| ? 1.25 (GeV/c)2 for photon energies of 2.5, 3.4 and 5.0 GeV. The measurements were carried out on a polarized butanol target. Both particles in the final state were detected: the pion by a magnetic spectrometer, the recoil nucleon in a scintillation counter matrix. The asymmetry was found to be negative with values around ?0.4. |
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