Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Search for a muonic dark force at BABAR   Many models of physics beyond the Standard Model predict the existence of new
Abelian forces with new gauge bosons mediating interactions between "dark
sectors" and the Standard Model. We report a search for a dark boson Z'
coupling only to the second and third generations of leptons in the reaction
e+e- -> mu+mu- Z', Z' -> mu+mu- using 514 fb-1 of data collected by the BABAR
experiment. No significant signal is observed for Z' masses in the range 0.212
- 10 GeV. Limits on the coupling parameter g' as low as 7x10^-4 are derived,
leading to improvements in the bounds compared to those previously derived from
neutrino experiments.

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The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
35
The categories of this paper are: mtrl-th
18
The categories of this paper are: econ
4
The categories of this paper are: cond-mat
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
27
The categories of this paper are: comp-gas
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The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
24
The categories of this paper are: dg-ga
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The categories of this paper are: eess
9
The categories of this paper are: nlin