Abstract
We calculate the exclusive semi-leptonic bottom baryon decays Λ b →Λ c +ℓ −+ v ℓ , Σ b → Σ c +ℓ −+ v ℓ and Σ b →Σ c ∗+ℓ −+ v ℓ in the spectator quark model. The helicity structure of the baryonic current transitions Λ b→ Λ c, Σ b →Σ c (Σ c ∗) is matched to the helicity structure of the free quark current transitions b → c at minimum momentum transfer q 2 = 0. The results are continued to q 2≠0 by pole dominated form factors. We obtain semi-leptonic baryonic decay rates which are close to the corresponding semi-leptonic mesonic decay rates.
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