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- W2743733170 abstract "The excitation energies of the $Lambda_{c}$ and $Lambda_{b}$ baryons are investigated in a finite-size diquark potential model, in which the heavy baryons are treated as bound states of a charm quark and a scalar-isoscalar diquark. The diquark is considered as a sizable object. The quark-diquark interaction is calculated as a sum of the quark-quark interaction which is assumed to be half of the quark-antiquark interaction for the color singlet. The potential parameters in the quark-antiquark interaction are fixed so as to reproduce the charmonium spectrum. We find the diquark size to be 1.1 fm for the diquark mass 0.5 GeV/c$^{2}$ to reproduce the $1p$ excitation energy of $Lambda_{c}$. In this model, the $Lambda_{c}$ and $Lambda_{b}$ excitation spectra are reproduced well, while this model does not explain $Lambda_{c}(2765)$, whose isospin nor spin-parity are unknown yet. Thus, the detailed properties of $Lambda_{c}(2765)$ is very important to the presence of the diquark in heavy baryons as a effective constituent. We also discuss the $Xi_{c}$ spectrum with the scalar strange diquark." @default.
- W2743733170 created "2017-08-17" @default.
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- W2743733170 date "2017-12-01" @default.
- W2743733170 modified "2023-10-18" @default.
- W2743733170 title "Excitation energy spectra of the $Lambda_{c}$ and $Lambda_{b}$ baryons in a finite-size diquark model" @default.
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- W2743733170 doi "https://doi.org/10.1093/ptep/ptx155" @default.
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