Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the ratio of the charged kaon leptonic decays at NA62   The ratio of the leptonic charged kaon decays $R_K= \Gamma(K^{\pm} \to
e^{\pm}\nu) / \Gamma(K^{\pm} \to \mu^{\pm}\nu)$ is sensitive to the structure
of the week interactions and can be precisely calculated within the Standard
Model. Presence of New Physics can introduce a shift on its value of the order
of a percent. The NA62 experiment at CERN SPS used data from a dedicated run in
2007 to perform a measurement of this ratio and probe the lepton universality.
The data analysis technique and the final results are presented.

15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
3
The categories of this paper are: physics
22
The categories of this paper are: chao-dyn
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
17
The categories of this paper are: q-fin
1
The categories of this paper are: cs
29
The categories of this paper are: funct-an
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph