Chiral symmetry and diffractive neutral pion photo- and electroproduction |
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Authors: | C Ewerz O Nachtmann |
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Institution: | 1.ECT*,Villazzano (Trento),Italy;2.Institut für Theoretische Physik,Universit?t Heidelberg,Heidelberg,Germany |
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Abstract: | We show that diffractive production of a single neutral pion in photon-induced reactions at high energy is dynamically suppressed
due to the approximate chiral symmetry of QCD. These reactions have been proposed as a test of the odderon-exchange mechanism.
We show that the odderon contribution to the amplitude for such reactions vanishes exactly in the chiral limit. This result
is obtained in a nonperturbative framework and by using PCAC relations between the amplitudes for neutral pion and axial vector
current production. |
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Keywords: | |
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