We present a lattice QCD determination of the chiral quark condensate based on a new method. We extract the quark condensate from the operator product expansion of the quark propagator at short euclidean distances, where it represents the leading contribution in the chiral limit. From this study we obtain <(q) over barq > MS( 2 GeV) = -( 265 +/- 5 +/- 22MeV)(3), in good agreement with determinations of this quantity based on different approaches. The simulation is performed by using the O( a)- improved Wilson action at beta = 6.45 on a volume 32(3) x 70 in the quenched approximation.
Gimenez, V., Lubicz, V., Mescia, F., Porretti, V., Reyes, J. (2005). Operator product expansion and quark condensate from lattice QCD in coordinate space. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 41(4), 535-544 [10.1140/epjc/s2005-02250-9].
Operator product expansion and quark condensate from lattice QCD in coordinate space
LUBICZ, Vittorio;
2005-01-01
Abstract
We present a lattice QCD determination of the chiral quark condensate based on a new method. We extract the quark condensate from the operator product expansion of the quark propagator at short euclidean distances, where it represents the leading contribution in the chiral limit. From this study we obtain <(q) over barq > MS( 2 GeV) = -( 265 +/- 5 +/- 22MeV)(3), in good agreement with determinations of this quantity based on different approaches. The simulation is performed by using the O( a)- improved Wilson action at beta = 6.45 on a volume 32(3) x 70 in the quenched approximation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
