Regge Behavior And Mass Spectrum Of Heavy Hadrons

Knowing spectral information of individual baryons contributes to a deeper understanding of non-perturbation quantum chromodynamics,because the heavy quarks inside the baryons give us a"flavor tag"to explore the nature of quark interactions.Similar to the hydrogen-like system,the quantum states containing a heavy flavor quark bound system can be well labeled by light degrees of freedom,which provides a good opportunity for us to construct and reveal the excited states of the heavy taste baryon family.Over the past two decades,different experimental collaborators have announced more than two dozen candidates for charm-baryons,a step forward in the study of charm-baryons.Unlike charm baryons,finding the bottom baryon state is far from easy to experiment with,because the bottom baryons seem to be more difficult to produce than charm baryons.After 2017,with the discovery of resonance states of a number of flavor,the study of baryons of heavy taste has attracted more attention.In this paper,the spectrum and structure of baryons of heavy taste are mainly studied by using QCD string model,and the quantum number of excited states of some baryons of heavy taste((?)_Q,(50)_Q)is determined and predicted.Chapter 1.Mainly introduces the quark model and the phenomenological model used to calculate the structure of hadrons,including the quark model,the Cornell potential model,the MIT bag model,and the GI model.Chapter 2.A simple hadron mass calculation formula is derived from the string model and applied to the calculation of hadron orbital excitation.Chapter 3.We use the Regge trajectory method to re-examine the orbital excitation mass spectra of charm and bottom taste baryons in a heavy quark-double quark picture.The results show that the average spin mass spectrum of baryons in the orbital excited(state)charm and bottom taste can be described by the linear Regge relation derived from the rotational QCD string model.By analyzing the mass splitting caused by the spin orbit interaction,we explain the baryons of(?)_b(6227)and)05(_b(6097),the)05(_c(2800)and?_c(2930)to be the 1P wave baryons(mass splitting),and their most favored spin parity.Furthermore,the mass prediction of(?)_b(6227)bottom baryons in P and D waves is given,which provides a clue for future experiments like LHCb.