Fermion Interactions in the Wilson Yukawa Approach for Lattice Chiral Gauge Theories

We consider fermion-gauge couplings in the Wilson-Yukawa approach for lattice chiral gauge theories. At the leading order of a fermionic hopping parameter expansion we find that the fermion-gauge coupling has a chiral and tree-like structure. We argue that this fermion-gauge coupling remains non-zero in the continuum limit taken in the Higgs phase. Possible fermion-scalar couplings in this approach are considered. We also evaluate the fermion interaction with an external gauge field in the slightly modified model and show that it has a chiral structure in general.Comment: 16 pages (LaTex, no figures), UTHEP-24

Regularizations, Anomalies and Fermion Number Non-Conservation in Chiral Gauge Theories

We study how fermion number conservation fails in fermion number preserving regularization schemes. We show that the fermion number have to be carried by the gauge field configurations with non-zero winding number in this scheme and this fermion number is not conserved in the presence of instantons. We also consider other types of regularization scheme which have different global symmetries. In particular, we point out that the fermion number is conserved in the lattice chiral gauge theories with the Wilson-Yukawa coupling.Comment: 14 pages(Tex, no figures

Lattice Studies for hadron spectroscopy and interactions

Recent progresses of lattice QCD studies for hadron spectroscopy and interactions are briefly reviewed. Some emphasis are given on a new proposal for a method, which enable us to calculate potentials between hadrons. As an example of the method, the extraction of nuclear potential in lattice QCD is discussed in detail.Comment: 7 pages, 6 figures (10 pdf files), a plenary talk given at "XV International Conference on Hadron Spectroscopy-Hadron 2013", 4-8 November 2013, Nara, Japa