Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Pion and kaon role in $\tau$ decays, g_{\mu}-2, the running of
  $\alpha_{QED}$ and the muonium hyperfine splitting   We make use of recent accurate results obtained for the pion and kaon vector
form factors within a chiral unitary approach in order to calculate the decay
widths of the $\tau$ lepton to these mesons and also to evaluate the
contribution of this two mesons to the anomalous magnetic moment of the muon,
the running of the fine structure constant and the muonium hyperfine splitting.

20
The categories of this paper are: acc-phys
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
17
The categories of this paper are: q-fin
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
31
The categories of this paper are: ao-sci