Zusammenfassung
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 flavor-singlet mesons and investigate the mixing of charmonia near open charm thresholds with pairs of (excited) D and (D) over bar mesons. For charm and light valence quarks and n(F) = 2 sea quarks, we employ the ...
Zusammenfassung
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 flavor-singlet mesons and investigate the mixing of charmonia near open charm thresholds with pairs of (excited) D and (D) over bar mesons. For charm and light valence quarks and n(F) = 2 sea quarks, we employ the nonperturbatively improved Sheikholeslami-Wohlert (clover) action. Excited states are accessed using the variational technique, starting from a basis of suitably optimized operators. For some aspects of this study, the use of improved stochastic all-to-all propagators was essential.
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