Strong and radiative decays of the low-lying D -wave singly heavy baryons
Year: 2018
Type: article
Abstract: The strong and radiative decays of the low-lying $\ensuremath{\lambda}$-mode $D$-wave ${\mathrm{\ensuremath{\Lambda}}}_{c(b)}$, ${\mathrm{\ensuremath{\Sigma}}}_{c(b)}$, ${\mathrm{\ensuremath{\Xi}}}_{c(b)}$, ${\mathrm{\ensuremath{\Xi}}}_{c(b)}^{\ensuremath{'}}$, and ${\mathrm{\ensuremath{\Omega}}}_{c(b)}$ baryons are studied in a constituent quark model. Our calculation shows the following: (i) The missing $\ensuremath{\lambda}$-mode $D$-wave ${\mathrm{\ensuremath{\Omega}}}_{c(b)}$, ${\mathrm{\ensuremath{\Lambda}}}_{b}$, and ${\mathrm{\ensuremath{\Xi}}}_{b}$ baryons have a relatively narrow decay width of a few MeV or a few tens of MeV and their dominant strong and radiative decay channels can be ideal for searching for their signals in future experiments. (ii) The $\ensuremath{\lambda}$-mode $1D$-wave excitations in the ${\mathrm{\ensuremath{\Sigma}}}_{c(b)}$ and ${\mathrm{\ensuremath{\Xi}}}_{c(b)}^{\ensuremath{'}}$ families appear to have a relatively broad width of $\ensuremath{\sim}50--200\text{ }\text{ }\mathrm{MeV}$. Most of the $1D$-wave states have large decay rates into the $1P$-wave heavy baryons via the pionic or kaonic strong decay processes, which should be taken seriously in future observations. (iii) Both ${\mathrm{\ensuremath{\Lambda}}}_{c}(2860)$ and ${\mathrm{\ensuremath{\Xi}}}_{c}(3050)$ seem to favor the ${J}^{P}=3/{2}^{+}$ excitation $|{^{2}D}_{\ensuremath{\lambda}\ensuremath{\lambda}}{\frac{3}{2}}^{+}⟩$ of ${\overline{\mathbf{3}}}_{F}$, while both ${\mathrm{\ensuremath{\Lambda}}}_{c}(2880)$ and ${\mathrm{\ensuremath{\Xi}}}_{c}(3080)$ may be assigned as the ${J}^{P}=5/{2}^{+}$ excitation $|{^{2}D}_{\ensuremath{\lambda}\ensuremath{\lambda}}{\frac{5}{2}}^{+}⟩$ of ${\overline{\mathbf{3}}}_{F}$, The nature of ${\mathrm{\ensuremath{\Xi}}}_{c}(3050)$ and ${\mathrm{\ensuremath{\Xi}}}_{c}(3080)$ could be tested by the radiative transitions ${\mathrm{\ensuremath{\Xi}}}_{c}(3055{)}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}_{c}(2790{)}^{0}\ensuremath{\gamma}$ and ${\mathrm{\ensuremath{\Xi}}}_{c}(3080{)}^{0}\ensuremath{\rightarrow}{\mathrm{\ensuremath{\Xi}}}_{c}(2815{)}^{0}\ensuremath{\gamma}$, respectively.
Authors: Ya-Xiong Yao, Kai-Lei Wang, Xian-Hui Zhong
Institution: Hunan Normal University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Awards: G4490685069, G884906333
OpenAlex ID: W4240054986