Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dark Photon Search in the Mass Range Between 1.5 and 3.4 GeV/$c^2$   Using a data set of 2.93 fb$^{-1}$ taken at a center-of-mass energy
$\sqrt{s}$ = 3.773 GeV with the BESIII detector at the BEPCII collider, we
perform a search for an extra U(1) gauge boson, also denoted as a dark photon.
We examine the initial state radiation reactions $e^+e^-\rightarrow
e^+e^-\gamma_{\rm ISR}$ and $e^+e^-\rightarrow \mu^+\mu^-\gamma_{\rm ISR}$ for
this search, where the dark photon would appear as an enhancement in the
invariant mass distribution of the leptonic pairs. We observe no obvious
enhancement in the mass range between 1.5 and 3.4 GeV/$c^{2}$ and set a 90%
confidence level upper limit on the mixing strength of the dark photon and the
Standard Model photon. We obtain a competitive limit in the tested mass range.

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The categories of this paper are: atom-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: mtrl-th
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The categories of this paper are: acc-phys
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The categories of this paper are: astro-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph
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The categories of this paper are: quant-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: physics
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: econ
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The categories of this paper are: cs