DOI 10.1007/s100529900017
Improved effective action for light quarks beyond the chiral limit
Theoretical Physics Department, Tashkent State University, Tashkent 700095, Uzbekistan (e-mail: yousuf@univer.tashkent.su, cc: yousuf@iaph.silk.org)
Received: 19 October 1998 / Revised version: 17 January 1999 / Published online: 20 May 1999
Abstract
We propose an improvement of the
Diakonov-Petrov effective action on the
basis of the Lee-Bardeen results for
the quark determinant in the instanton
field. This improved effective action provides a proper
account of the current quark masses,
which is particularly important for
strange quarks. This action is successfully tested by
calculations of the
quark condensate, the masses of the pseudoscalar meson octet
and axial-anomaly low-energy theorems.
Copyright Springer-Verlag
