Regular Article - Theoretical Physics
Search for hidden-charm pentaquark states in three-body final states
School of Physics, Beihang University, 100191, Beijing, China
2 Institute of High Energy Physics, Chinese Academy of Sciences, 100049, Beijing, China
3 School of Space and Environment, Beihang University, 100191, Beijing, China
4 Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, 100191, Beijing, China
5 School of Physics and Microelectronics, Zhengzhou University, 450001, Zhengzhou, Henan, China
Accepted: 12 November 2022
Published online: 24 November 2022
The three pentaquark states, , and , discovered by the LHCb Collaboration in 2019, are often interpreted as molecules. Together with their four partners dictated by heavy quark spin symmetry they represent a complete multiplet of hadronic molecules of . The pentaquark states were observed in the invariant mass distributions of the decay. It is widely recognized that to understand their nature, other discovery channels play an important role. In this work, we investigate two three-body decay modes of the molecules. The tree-level modes proceed via off-shell baryons, , while the triangle-loop modes proceed through , via rescattering to and . Our results indicate that the decay widths of the and states into are several MeV, as a result can be observed in the upcoming Run 3 and Run 4 of LHC. The partial decay widths into of the and states range from tens to hundreds of keV. In addition, the partial decay widths of molecules into and are several keV and tens of keV, respectively, and the partial decay widths of molecules into vary from several keV to tens of keV. In particular, we show that the spin-5/2 state can be searched for in the and invariant mass distributions, while the latter one is more favorable. These three-body decay modes of the pentaquark states are of great value to further observations of the pentaquark states and to a better understanding of their nature.
© The Author(s) 2022
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