Interpretation of the newly observed $Λ_b(6146)^{0}$ and $Λ_b(6152)^0$ states in a chiral quark model

An updated review of the new hadron states

“…This problem was further investigated in Refs. [263,264] using two similar quark models, and the same conclusion was obtained, which needs to be clarified in the future.…”

Interpretation of the observed $Λ_b(6146)^0$ and $Λ_b(6152)^0$ states as 1$D$ bottom baryons

“…Then, the possible interference effects which were ignored in the LHCb's analysis [12] might be important to pin down the decay behaviors of Λ b (6146) 0 and Λ b (6152) 0 . Another possible explanation is that the mass inversion may occur for the 1D Λ 0 b states [32,33]. That is to say, the Λ b (6146) 0 with smaller mass should be the J P = 5/2 + state, while the Λ b (6152) 0 should be a J P = 3/2 + state.…”

The $1D$, $2D$ $Ξ_{b}$ and $Λ_{b}$ baryons

“…Finally, we would like to note that not only masses but also decay and production properties are In summary, theoretical and experimental physicists have made great progresses in the field of single bottom baryons, such as the Λ b (6072) [3,4], Λ b (6146) [10][11][12][13], Λ b (6152) [10][11][12][13], Ξ b (6227) [5][6][7], Ξ b (6100) [8], Ξ b (6327) [10,18] and Ξ b (6333) [10,18]. Stimulated by the observations of these new bottom states, we carry out a systematical study about the 1D and 2D Λ b and Ξ b baryons with the method of QCD sum rules.…”

“…By studying their strong decays using quark model or 3 P 0 model, people interpreted these two states as a Λ b (1D) doublet [6,[10][11][12][13]. Before this observation, different collaborations predicted the masses of this doublet with the quark model [14][15][16][17], whose results were not consistent well with each other and with the experiments, and need further confirmations by different theoretical metheds/models.…”

“…Very recently, LHCb collaboration reported the observation of two new excited Ξ b states in the Λ b K − π + mass spectrum [18]. The measured masses and widths are m Ξ b (6327) = 6327.28 +0.23 −0.21 (stat)±0.08(syst)±0.24(m Λb ) MeV Γ Ξ b (6327) < 2.20 MeV m Ξ b (6333) = 6332.69 +0.17 People have adopted many theoretical methods/models in the past decades to investigate the bottom baryons, including quark model [12,[14][15][16], heavy hadron chiral perturbation theory [42][43][44][45][46][47], 3 P 0 decay model [48][49][50][51][52][53][54], lattice QCD [55][56][57][58], light cone QCD sum rules [59][60][61][62][63][64][65][66] and QCD sum rules [67][68][69][70][71][72][73][74][75][76], etc. For more discussions about the bottom baryon states, one can consult the Refs.…”