CERN Accelerating science

Article
Report number	arXiv:2004.00531
Title	Identifying the $\Xi_c^0$ baryons observed by LHCb as $P$-wave $\Xi_c^\prime$ baryons
Author(s)	Yang, Hui-Min (Beihang U.) ; Chen, Hua-Xing (Beihang U. ; Southeast U., Nanjing) ; Mao, Qiang
Publication	2020-12-07
Imprint	2020-04-01
Number of pages	16
Note	16 pages, 1 figure, 3 tables, accepted by PRD
In:	Phys. Rev. D 102 (2020) pp.114009
DOI	10.1103/PhysRevD.102.114009 10.1103/PhysRevD.102.114009 (publication)
Subject category	hep-lat ; Particle Physics - Lattice ; hep-ex ; Particle Physics - Experiment ; hep-ph ; Particle Physics - Phenomenology
Accelerator/Facility, Experiment	CERN LHC ; LHCb
Abstract	We systematically study mass spectra and decay properties of $P$-wave $\Xi_c^\prime$ baryons of the $SU(3)$ flavor $\mathbf{6}_F$, using the methods of QCD sum rules and light-cone sum rules within the framework of heavy quark effective theory. Our results suggest that the three excited $\Xi_c^0$ baryons recently observed by LHCb can be well explained as $P$-wave $\Xi_c^\prime$ baryons: the $\Xi_c(2923)^0$ and $\Xi_c(2939)^0$ are partner states of $J^P = 1/2^-$ and $3/2^-$ respectively, both of which contain one $\lambda$-mode orbital excitation; the $\Xi_c(2965)^0$ has $J^P = 3/2^-$, and also contains one $\lambda$-mode orbital excitation. We propose to search for another $P$-wave $\Xi_c^\prime$ state of $J^P = 5/2^-$ in the $\Lambda_c K/\Xi_c \pi$ mass spectral in future experiments. Its mass is about $56^{+30}_{-35}$ MeV larger than the $\Xi_c(2965)^0$, and its width is about $18.1^{+19.7}_{- 8.3}$ MeV.
Copyright/License	preprint: (Licenses: CC-BY-4.0, arXiv nonexclusive-distrib 1.0)

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