Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of the Axial Anomaly on the Lattice with O(a)-improved Wilson
  Action   Flavor singlet and non-singlet axial Ward identities are investigated using
the Wilson formulation of lattice QCD with Clover O(a)-improvement, which
breaks explicitly chiral symmetry. The matching at one-loop order of all the
relevant renormalization constants with the continuum \bar{MS} scheme is
presented. Our calculations include: 1) the contributions arising from the
Clover term of the action; 2) the complete mixing of the gluon operator G
\tilde{G} with the divergence of the singlet axial current; 3) the use of both
local and extended definitions of the fermionic bilinear operators. A
definition of the gluon operator G \tilde{G} on the lattice outside the chiral
limit is proposed. Our definition takes into account the possible
power-divergent mixing with the pseudoscalar density, generated by the breaking
of chiral symmetry. A non-perturbative procedure for the evaluation of such
mixing constant is worked out. Finally, the renormalization properties of the
composite insertion of the topological charge operator relevant for the lattice
calculation of the neutron electric dipole moment, induced by the strong
CP-violating term of the QCD Lagrangian, are discussed.

28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn