Canonical interpretation of the newly observed Λb(6146)0 and Λb

Abstract

Stimulated by the newly observed Λ b ð6146Þ 0 and Λ b ð6152Þ 0 resonances, we investigate the strong decays of the low-lying singly bottom baryons within the quark pair creation model. Considering their masses and decay modes, we tentatively assign these states as the λ-mode Λ b ð2SÞ, Λ b ð1DÞ, Σ b ð2SÞ, and Σ b ð1PÞ states and then estimate their strong decay widths. Compared with the experimental total widths and decay modes measured by the LHCb Collaboration, the Λ b ð6146Þ 0 and Λ b ð6152Þ 0 can be reasonably clarified into the J P ¼ 5=2 þ and J P ¼ 3=2 þ Λ b ð1DÞ states, respectively, while other canonical assignments are disfavored. Other low-lying bottom states are also presented, where various narrow states may have good potential to be observed in future LHCb experiments.

Interpretation of the newly observed Λb(6146) and Λb(6152Wang1, Lü2, Zhong3 2019Phys. Rev. DSelf Cite372250View full textAdd to dashboardCite

“…Both the decay width and decay mode are consistent with the observations of Λ b (6146) considering the model uncertainties. This conclusion is consistent with that of the 3 P 0 model [41].…”

“…which are in agreement with the the 3 P 0 model predictions [41]. The partial width ratio between Σ b π and Σ * b π channels is predicted to be…”

“…To identify the Λ b (6146) and Λ b (6152) resonances in the quark model, their strong decay behaviors were studied with the 3 P 0 model in Ref. [41]. The results indicated that the Λ b (6146) and Λ b (6152) can be assigned as the Λ b (1D) doublet with J P = 5/2 + and J P = 3/2 + , respectively.…”

Strong decays of the newly observed narrow $$\Omega _b$$ structures

“…Then, the γ = 9.83 is obtained by reproducing the width Γ[Σ c (2520) ++ → Λ c π + ] = 14.78 MeV [5,45]. With this overall parameter γ, the strong decay behaviors of the ground and excited Λ Q and Σ Q states can be well described [45][46][47]. (1P) states are considered and the total decay widths are listed in the Tab.…”

Interpretation of the observed Λb(6146)0 and ΛbChen1, Luo2, Liu3 et al. 2019Phys. Rev. D346322View full textAdd to dashboardCite

“…Then, the possible interference effects, which were ignored in the LHCb analysis [12], might be important to pin down the decay behaviors of Λ b ð6146Þ 0 and Λ b ð6152Þ 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 ð6146Þ 0 with smaller mass should be the J P ¼ 5=2 þ state, while the Λ b ð6152Þ 0 should be a J P ¼ 3=2 þ state.…”