FIZIKA B 8 (1999) 2, 303-320

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

DUBRAVKO KLABUČAR^a and DALIBOR KEKEZ^b

^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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