Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of Dalitz decay phi -> eta e+e- with KLOE detector   We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-,
with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7
fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay
signal of ~31,000 events from which we measured a value of BR(phi -> eta
e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine the
transition form factor by a fit to the e+e- invariant mass spectrum, obtaining
b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the
precision of the previous measurement and is in good agreement with VMD
expectations.

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The categories of this paper are: hep-ph
15
The categories of this paper are: nucl-ex
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
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The categories of this paper are: econ
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: chem-ph
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys