Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for Lepton Flavor Violation in $\Upsilon (3S)\rightarrow
  e^{\pm}\mu^{\mp}$   We report on the first search for electron-muon lepton flavor violation (LFV)
in the decay of a $b$~quark and $b$~antiquark bound state. We look for the LFV
decay $\Upsilon (3S)\rightarrow e^{\pm}\mu^{\mp}$ in a sample of 118~million
$\Upsilon (3S)$ mesons from 27~fb$^{-1}$ of data collected with the \babar\
detector at the SLAC PEP-II $e^+e^-$ collider operating with a 10.36~GeV
center-of-mass energy. No evidence for a signal is found and we set a limit on
the branching fraction $\mathcal{B}(\Upsilon(3S)\rightarrow
e^{\pm}\mu^{\mp})<3.6\times10^{-7}\mathrm{at~ 90\%~ CL}$. This result can be
interpreted as a limit $\Lambda_{NP}/g^2_{NP} > 80~$TeV on the energy scale
$\Lambda_{NP}$ divided by the coupling-squared $g^2_{NP}$ of relevant new
physics.

23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
0
The categories of this paper are: hep-ph
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
13
The categories of this paper are: quant-ph
21
The categories of this paper are: adap-org
6
The categories of this paper are: astro-ph
24
The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
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The categories of this paper are: patt-sol