FIZIKA B 3 (1994) 2, 135-146

QUARK OFF-SHELLNESS IN K, B®gg DECAYS

JAN O. EEG^* and IVICA PICEK^**
* TH Division, CERN, CH-1211 Geneva 23, Switzerland
^** Department of Physics, Faculty of Science, University of Zagreb, POB 162, HR-41000 Zagreb, Croatia

Received 29 July 1994

We demonstrate the importance of the quark off-shellness on examples of the radiative pseudoscalar meson decays, characterized by the simplest hadronic matrix elements. We point out that roughly a quarter of the empirical K_L®gg amplitude originates in the quark off-shellness in kaon. For B_S®gg we also find non-negligible contributions that increase the decay rate by a factor of 1.5 to 3.

UDC 539.12
PACS 12.15.Lk

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