出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We study the vacuum polarization functions on the lattice with exact chiral symmetry of overlap
fermion by matching the lattice data at large momentum scales with the Operator Product
Expansion (OPE). We extract the strong coupling constant as(m) in two-flavor QCD as L(2)
MS
=
0.234(9)(+16
− 0 ) GeV. From the analysis of the difference between the vector and axial-vector channels,
we extract some of the four-quark (dimension-six) condensates.
