1707.01779Jul 6, 20176 pages, 2 figures, 1 table; A mistake was found when evaluating decay constants of the S-wave charmed baryons. The conclusion is not changed
We systematically study the S-wave doubly charmed baryons using the method of QCD sum rules. Our results suggest that the Ξcc++ recently observed by LHCb can be well identified as the S-wave Ξcc
Nearby in the stack
state of
JP=1/2+
. We study its relevant
Ωcc
state, whose mass is predicted to be around 3.7 GeV. We also systematically study the
P
-wave doubly charmed baryons, whose masses are predicted to be around 4.1 GeV. Especially, there can be several excited doubly charmed baryons in this energy region, and we suggest to search for them in order to study the fine structure of the strong interaction.