Phys. Rev. C 68, 015203 (2003) [9 pages]Analysis of a quenched lattice-QCD dressed-quark propagatorReceived 1 April 2003; published 29 July 2003 Quenched lattice-QCD data on the dressed-quark Schwinger function can be correlated with dressed-gluon data via a rainbow gap equation so long as that equation’s kernel possesses enhancement at infrared momenta above that exhibited by the gluon alone. The required enhancement can be ascribed to a dressing of the quark-gluon vertex. The solutions of the rainbow gap equation exhibit dynamical chiral symmetry breaking and are consistent with confinement. The gap equation and related, symmetry-preserving ladder Bethe-Salpeter equation yield estimates for chiral and physical pion observables that suggest these quantities are materially underestimated in the quenched theory; |〈q̅ q〉| by a factor of 2 and fπ by 30%. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.68.015203
DOI:
10.1103/PhysRevC.68.015203
PACS:
12.38.Lg, 12.38.Gc, 12.38.Aw, 24.85.+p
|
|
About | Terms and Conditions | Subscriptions | Search | Help
Use of the American Physical Society websites and journals implies that the user has read and agrees to our Terms and Conditions and any applicable Subscription Agreement. Physical Review®, Physical Review Letters®, Reviews of Modern Physics®, and Physical Review Special Topics® are trademarks of the American Physical Society.