Search for doubly heavy dibaryons in the quark delocalization color screening model
Zhuocheng Xia, Saijun Fan, Xinmei Zhu, Hongxia Huang, Jialun Ping
Abstract
We perform a systemical investigation of the low-lying doubly heavy dibaryon systems with strange $S=0$, isospin $I=0$, 1, 2, and the angular momentum $J=0$, 1, 2, 3 in the quark delocalization color screening model. We find the effect of channel-coupling cannot be neglected in the study of the multi-quark systems. Several bound systems are obtained. They are the doubly charm dibaryon systems with $IJ=00$, $IJ=01$, and $IJ=02$, and the corresponding energies are 4590, 4720, and 4764 MeV, respectively; and the doubly bottom dibaryon systems with $IJ=00$, $IJ=02$, and $IJ=13$, and the corresponding energies are $11\phantom{\rule{0.16em}{0ex}}219$, $11\phantom{\rule{0.16em}{0ex}}416$, and $11\phantom{\rule{0.16em}{0ex}}633$ MeV, respectively. Besides, six resonance states are obtained, which are $IJ=00\phantom{\rule{4pt}{0ex}}N{\mathrm{\ensuremath{\Xi}}}_{cc}$ and $N{\mathrm{\ensuremath{\Xi}}}_{bb}$ with resonance masses of 4730 and 11411 MeV respectively, $IJ=11\phantom{\rule{4pt}{0ex}}N{\mathrm{\ensuremath{\Xi}}}_{cc}^{*}$ and $N{\mathrm{\ensuremath{\Xi}}}_{bb}^{*}$ with resonance masses of 4775 and 11432 MeV respectively, and $IJ=12\phantom{\rule{4pt}{0ex}}{\mathrm{\ensuremath{\Sigma}}}_{c}{\mathrm{\ensuremath{\Sigma}}}_{c}^{*}$ and ${\mathrm{\ensuremath{\Sigma}}}_{b}{\mathrm{\ensuremath{\Sigma}}}_{b}^{*}$ with resonance masses of 4935 and 11626 MeV respectively. All these heavy dibaryons are worth searching for in experiments, although it will be a challenging work.