Strong and electromagnetic decays of p-wave heavy baryons Λc1,Λ*c1

We first calculate the binding energy and the pionic and electromagnetic coupling constants of the lowest-lying p-wave heavy baryon doublet Λ_c1, Λ^*_c1 in the leading order of heavy quark expansion. Then we calculate the two-body decay widths with these couplings and compare our results with other approaches. Our results are Γ(Λ_c1-->Σ_cπ,Σ_cγ,Σ^*_cγ)=2.7,0.011,0.001 MeV and Γ(Λ^*_c1-->Σ_cπ,Σ_cγ,Σ^*_cγ,Λ_c1γ)=33,5,6,0.014 keV, respectively. We find that Λ_c1,Λ^*_c1-->Λ_cγ is strictly forbidden in the leading order of heavy quark expansion. At the order of O(1/m_c) their widths are 36 and 48 keV, respectively.