Non-Spectator Diquark Effects on Lifetimes of Λ_b, Ω_{b}^{(*)} and Weak Decay Rates of Σ_{b}^{(*)}, Ξ_{b}^{(*)}

Wu-Sheng Dai; Xin-Heng Guo; Xue-Qian Li; Gang Zhao

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arXiv · hep-ph/9902421

Non-Spectator Diquark Effects on Lifetimes of Λ_b, Ω_{b}^{()} and Weak Decay Rates of Σ_{b}^{()}, Ξ_{b}^{(*)}

Wu-Sheng Dai·Xin-Heng Guo·Xue-Qian Li·Gang Zhao

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Abstract

The difference of τ_{_B} and τ_{_{Λ_b}} indicates the role of the light flavors. We calculate the lifetimes of B-meson and Λ_b based on the weak effective Hamiltonian while assuming the heavy baryon is constructed by a heavy b-quark and a diquark containing two light quarks. In this scenario, we use the information of the measured ratio τ_{_{Λ_b}}/τ_{_B} as input to predict rates of the inclusive weak decays of Σ_{b}^{(*)} and Ξ_{b}^{(*)} into non-bottom final states. We find that these rates of Σ_{b}^{(*)} and Ξ_{b}^{(*)} are much larger than that of B-mesons and Λ_b. We also give the predictions for the lifetimes of Ω_b and Ω_{b}^{*}. Phenomenological implication of our result is discussed.

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Wu-Sheng Dai, Xin-Heng Guo, Xue-Qian Li, Gang Zhao. 1999-02-22. Non-Spectator Diquark Effects on Lifetimes of Λ_b, Ω_{b}^{(*)} and Weak Decay Rates of Σ_{b}^{(*)}, Ξ_{b}^{(*)}. https://arxiv.org/abs/hep-ph/9902421

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