Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of eta_c(1S) and eta_c(2S) decays to K+ K- pi+ pi- pi0 in
  two-photon interactions   We study the processes gamma gamma -> K^0_S K pi and gamma gamma -> K+ K- pi+
pi- pi0 using a data sample of 519.2 fb-1 recorded by the BaBar detector at the
PEP-II asymmetric-energy e+e- collider at center-of-mass energies near the
Upsilon(nS) (n = 2,3,4) resonances. We observe the eta_c(1S), chi_c0(1P) and
eta_c(2S) resonances produced in two-photon interactions and decaying to
K+K-pi+pi-pi0, with significances of 18.1, 5.4 and 5.3 standard deviations
(including systematic errors), respectively, and report 4.0sigma evidence of
the chi_c2(1P) decay to this final state. We measure the eta_c(2S) mass and
width in K^0_S K pi decays, and obtain the values m(eta_c(2S))= 3638.5 +/- 1.5
+/- 0.8 MeV/c^2 and Gamma(eta_c(2S)) = 13.4 +/- 4.6 +/- 3.2 MeV, where the
first uncertainty is statistical and the second is systematic. We measure the
two-photon width times branching fraction for the reported resonance signals,
and search for the \chi_{c2}(2P) resonance, but no significant signal is
observed.

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The categories of this paper are: atom-ph
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The categories of this paper are: eess
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The categories of this paper are: solv-int
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The categories of this paper are: comp-gas
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The categories of this paper are: funct-an
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The categories of this paper are: astro-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: cs
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The categories of this paper are: patt-sol
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The categories of this paper are: stat
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: cond-mat