Abstract
The heavy baryon system bounded by the strong interaction has a rich internal structure, so its mass spectra can have the fine structure similar to the line spectra of atom bounded by the electromagnetic interaction. We systematically study the internal structure of P-wave varOmega _b baryons and calculate their D-wave decay properties. The present study, together with our previous studies on their mass spectra and S-wave decay properties, suggest that all the four excited varOmega _b baryons recently discovered by LHCb can be well explained as P-wave varOmega _b baryons, and their beautiful fine structure is directly related to the rich internal structure of P-wave varOmega _b baryons.
Highlights
The electromagnetic interaction holds the electrons and protons together inside a single atom, leading to the gross, fine, and hyperfine structures of the line spectra
An ideal platform to study this is the heavy baryon system containing one charm or bottom quark, which is interesting in a theoretical point of view [1,2,3]: the light quarks and gluons circle around the nearly static heavy quark, so that the whole system behaves as the QCD analogue of the hydrogen bounded by the electromagnetic interaction
In Refs. [47,48] we systematically studied mass spectra of P-wave heavy baryons using QCD sum rules [55,56] within the the framework of heavy quark effective theory (HQET) [57,58,59]
Summary
The electromagnetic interaction holds the electrons and protons together inside a single atom, leading to the gross, fine, and hyperfine structures of the line spectra. An ideal platform to study this is the heavy baryon system containing one charm or bottom quark, which is interesting in a theoretical point of view [1,2,3]: the light quarks and gluons circle around the nearly static heavy quark, so that the whole system behaves as the QCD analogue of the hydrogen bounded by the electromagnetic interaction This system has a rich internal structure, so its mass spectra can have the fine structure similar to hydrogen spectra [4,5,6,7]. We shall find that all of them can be well interpreted as Pwave Ωb baryons, so that both their mass spectra and decay properties can be well explained Their beautiful fine structure can be well explained in the framework of HQET, that is directly related to the rich internal structure of P-wave Ωb baryons
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