Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Muon decay in orbit: spectrum of high-energy electrons   Experimental searches for lepton-flavor-violating coherent muon-to-electron
conversion in the field of a nucleus, have been proposed to reach the
unprecedented sensitivity of 10^(-16) - 10^(-18) per stopped muon. At that
level, they probe new interactions at effective-mass scales well beyond 1000
TeV. However, they must contend with background from ordinary bound muon decay.
To better understand the background-spectrum shape and rate, we have carried
out a detailed analysis of Coulombic-bound-state muon decay, including nuclear
recoil. Implications for future experiments are briefly discussed.

24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
15
The categories of this paper are: nucl-ex
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
17
The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph