Vacuum condensates and the pion wave functions in the nonlocal chiral model
M. Praszalowicz, A. Rostworowski
Abstract
We use the simple instanton motivated Nambu Jona-Lasinio - type model to calculate a twist 3 pseudoscalar pion light cone wave function. Using normalisation condition for this wave function we calculate the quark condensate and also the gluon condensate, which agree with the phenomenological values for these quantities. Since we can compute also the kT2 dependence of the light cone wave functions, we calculate kT2 moments of the pseudo-scalar and axial-vector wave functions which are related to the mixed vacuum condensates. This allows us to extract the condensates and compare them with existing estimates.
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