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arxiv: 1110.2381 · v2 · pith:CEVO2CCHnew · submitted 2011-10-11 · ✦ hep-lat · hep-ph

Charmonium spectroscopy and mixing with light quark and open charm states from nF=2 lattice QCD

classification ✦ hep-lat hep-ph
keywords charmlightmixingcharmoniumexcitedimprovedmesonsopen
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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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