Analysis of the $Λ_Q$ baryons in the nuclear matter with the QCD sum rules

In this article, we study the $Λ_c$ and $Λ_b$ baryons in the nuclear matter using the QCD sum rules, and obtain the in-medium masses $M_{Λ_c}^*=2.335\,\rm{GeV}$, $M_{Λ_b}^*=5.678\,\rm{GeV}$, the in-medium vector self-energies $Σ^{Λ_c}_v=34\,\rm{MeV}$, $Σ^{Λ_b}_v=32\,\rm{MeV}$, and the in-medium pole residues $λ_{Λ_c}^*=0.021\,\rm{GeV}^3$, $λ_{Λ_b}^*=0.026\,\rm{GeV}^3$. The mass-shifts are $M_{Λ_c}^*-M_{Λ_c}=51\,\rm{MeV}$ and $M_{Λ_b}^*-M_{Λ_b}=60\,\rm{MeV}$, respectively.

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