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

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

2011-10-11

arxiv.org/abs/1110.2381v2

Phys. Rev. D84, 094506 (2011)

Physics

High Energy Physics

High Energy Physics - Lattice

23 pages, v2: references updated, correction of an ambiguous statement, minor typos corrected, some figures updated

Scientific paper

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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