https://doi.org/10.1140/epjc/s10052-016-4459-0
Regular Article - Theoretical Physics
Searching for hidden-charm baryonium signals in QCD sum rules
1
School of Physics, Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing, 100191, China
2
Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, SK, S7N 5E2, Canada
3
School of Physical Science and Technology, Lanzhou University, Lanzhou, 730000, China
4
Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS, Lanzhou University, Lanzhou, 730000, China
5
School of Physics, State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, 100871, China
6
Collaborative Innovation Center of Quantum Matter, Beijing, 100871, China
7
Center of High Energy Physics, Peking University, Beijing, 100871, China
* e-mail: wec053@mail.usask.ca
Received:
27
September
2016
Accepted:
24
October
2016
Published online:
4
November
2016
We give an explicit QCD sum rule investigation for hidden-charm baryonium states with the quark content 
, spin 
, and of both positive and negative parities. We systematically construct the relevant local hidden-charm baryonium interpolating currents, which can actually couple to various structures, including hidden-charm baryonium states, charmonium states plus two pions, and hidden-charm tetraquark states plus one pion, etc. We do not know which structure these currents couple to at the beginning, but after sum rule analyses we can obtain some information. We find some of them can couple to hidden-charm baryonium states, using which we evaluate the masses of the lowest-lying hidden-charm baryonium states with quantum numbers 
to be around 5.0 GeV. We suggest to search for hidden-charm baryonium states, especially the one of 
, in the D-wave 
and P-wave 
and 
channels in this energy region.
© The Author(s), 2016
