The vector and axial vector current in Wilson ChPT

Oliver Bar, Sinya Aoki
2008 Proceedings of The XXV International Symposium on Lattice Field Theory — PoS(LATTICE 2007)   unpublished
We construct the vector and axial vector currents in Wilson Chiral Perturbation Theory (WChPT), the low-energy effective theory for lattice QCD with Wilson fermions. Our construction is slightly different compared to ChPT in continuum QCD, where the currents are essentially the (partially) conserved currents associated with the chiral symmetries. In WChPT, due to explicit chiral symmetry breaking at non-zero lattice spacing, there appear O(a) terms in the expressions for the currents which do
more » ... t stem from the effective action. In addition, the finite renormalization of the currents needs to be taken into account in order to properly match the currents of the effective theory. As an illustration we compute f π to one loop with the renormalized axial vector current for a particular renormalization condition. It turns out that for this particular condition some of the O(a) corrections are taken care of by the renormalization. The XXV International Symposium on Lattice Field Theory
doi:10.22323/1.042.0062 fatcat:l4jmm7sdkjcl7jvgpz4k5jyvvm