Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: K_{e3} decays and CKM unitarity   We present a detailed numerical study of the K_{e3} decays to
O(p^6,(m_d-m_u)p^2,e^2p^2) in chiral perturbation theory with virtual photons
and leptons. We describe the extraction of the CKM matrix element |V_{us}| from
the experimental K_{e3} decay parameters. We propose a consistency check of the
K^+_{e3} and K^0_{e3} data that is largely insensitive to the dominating
theoretical uncertainties, in particular the contributions of order p^6. Our
analysis is highly relevant in view of the recent high statistics measurement
of the K^+_{e3} branching ratio by E865 at Brookhaven which does not indicate
any significant deviation from CKM unitarity but rather a discrepancy with the
present K^0_{e3} data.

9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
26
The categories of this paper are: bayes-an
20
The categories of this paper are: acc-phys
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org