FIZIKA B 8 (1999) 2, 303-320

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SCHWINGER-DYSON APPROACH AND GENERALIZED IMPULSE APPROXIMATION FOR THE p0g*g TRANSITION

DUBRAVKO KLABUČARa and DALIBOR KEKEZb

a Department of Physics, Faculty of Science, Zagreb University, P.O.B. 162, 10001 Zagreb, Croatia

b Ruđer Bošković Institute, P.O.B. 1016, 10001 Zagreb, Croatia

Received 3 March 1999; Accepted 12 July 1999

We review the pion-photon transition form factor calculated in the Schwinger-Dyson approach and an impulse approximation. We present results for it far above the scales presently accessible for measurement, up to 36 GeV2, and demonstrate agreement with the analytically inferred asymptotic behavior, for which we also provide a new derivation. We discuss how measurements at Jefferson Lab can provide information on how quarks are dynamically dressed.

PACS numbers: 11.10.St, 13.40.-f, 14.40.Aq, 14.40.-n, 14.40.Gx
UDC 539.126

Keywords: Schwinger-Dyson equations; Curtis-Pennington and Ball-Chiu vertices

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