Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charmonium spectroscopy and mixing with light quark and open charm
  states from nF=2 lattice QCD   We study the charmonium spectrum including higher spin and gluonic
excitations. We determine an upper limit on the mixing of the eta_c ground
state with light pseudoscalar flavour-singlet mesons and investigate the mixing
of charmonia near open charm thresholds with pairs of (excited) D and anti-D
mesons. For charm and light valence quarks and nF=2 sea quarks, we employ the
non-perturbatively improved Sheikholeslami-Wohlert (clover) action. Excited
states are accessed using the variational technique, starting from a basis of
suitably optimised operators. For some aspects of this study, the use of
improved stochastic all-to-all propagators was essential.

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The categories of this paper are: physics
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The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
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The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
23
The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: stat
31
The categories of this paper are: ao-sci
29
The categories of this paper are: funct-an
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: econ
27
The categories of this paper are: comp-gas