Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the extraction of zero momentum form factors on the lattice   We propose a method to expand correlation functions with respect to the
spatial components of external momenta. From the coefficients of the expansion
it is possible to extract Lorentz-invariant form factors at zero spatial
momentum transfer avoiding model dependent extrapolations. These objects can be
profitably calculated on the lattice. We have explicitly checked the validity
of the proposed procedure by considering two-point correlators with insertions
of the axial current, the form factors of the semileptonic decay of
pseudoscalar mesons, and the hadronic vacuum polarization tensor entering, for
example, the lattice calculation of the anomalous magnetic moment of the muon.

9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th