Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2007-09-29
PoSLAT2007:062,2007
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, no figures. Presented at the XXV International Symposium on Lattice Field Theory, July 30 - August 4 2007, Regensburg
Scientific paper
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 not 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_pi 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.
Aoki Sinya
Bar Oliver
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