Low-lying charmed and charmed-strange baryon states

Chen, Bing ( Department of Physics, Anyang Normal University, 455000, Anyang, China) ( Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS & Lanzhou University, 730000, Lanzhou, China) ; Wei, Ke-Wei ( Department of Physics, Anyang Normal University, 455000, Anyang, China) ; Liu, Xiang ( School of Physical Science and Technology, Lanzhou University, 730000, Lanzhou, China) ( Research Center for Hadron and CSR Physics, Institute of Modern Physics of CAS & Lanzhou University, 730000, Lanzhou, China) ; Matsuki, Takayuki ( Tokyo Kasei University, 1-18-1 Kaga, Itabashi, 173-8602, Tokyo, Japan) ( Theoretical Research Division, Nishina Center, RIKEN, 351-0198, Saitama, Japan)

10 March 2017

Abstract: In this work, we systematically study the mass spectra and strong decays of 1 P and 2 S charmed and charmed-strange baryons in the framework of non-relativistic constituent quark models. With the light quark cluster–heavy quark picture, the masses are simply calculated by a potential model. The strong decays are studied by the Eichten–Hill–Quigg decay formula. Masses and decay properties of the well-established 1 S and 1 P states can be reproduced by our method. Σc(2800)0,+,++ can be assigned as a Σc2(3/2-) or Σc2(5/2-) state. We prefer to interpret the signal Σc(2850)0 as a 2S(1/2+) state although at present we cannot thoroughly exclude the possibility that this is the same state as Σc(2800)0 . Λc(2765)+ or Σc(2765)+ could be explained as the Λc+(2S) state or Σc1+(1/2-) state, respectively. We propose to measure the branching ratio of B(Σc(2455)π)/B(Σc(2520)π) in the future, which may disentangle the puzzle of this state. Our results support Ξc(2980)0,+ as the first radial excited state of Ξc(2470)0,+ with JP=1/2+ . The assignment of Ξc(2930)0 is analogous to Σc(2800)0,+,++ , i.e., a Ξc2′(3/2-) or Ξc2′(5/2-) state. In addition, we predict some typical ratios among partial decay widths, which are valuable for experimental search for these missing charmed and charmed-strange baryons.


Published in: EPJC 77 (2017) 154
Published by: Springer/Società Italiana di Fisica
DOI: 10.1140/epjc/s10052-017-4708-x
License: CC-BY-3.0



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