QCD sum rules study of the $J^{PC}=1^{--}$ charmonium $Y$ mesons

R. M. Albuquerque, M. Nielsen

We use QCD sum rules to test the nature of the recently observed mesons Y(4260), Y(4350) and Y(4660), assumed to be exotic four-quark $(c\bar{c}q\bar{q})$ or $(c\bar{c}s\bar{s})$ s…