Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: V_us from kaon decays   During the last few years, new experimental and theoretical results have
allowed ever-more-stringent tests of the Standard Model to be performed using
kaon decays. This overview of recent progress includes updated results for the
evaluation of the CKM matrix element V_us from kaon decay data and related
tests of CKM unitarity and gauge and lepton universality.

33
The categories of this paper are: plasm-ph
22
The categories of this paper are: chao-dyn
21
The categories of this paper are: adap-org
23
The categories of this paper are: solv-int
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
26
The categories of this paper are: bayes-an
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph