Azizi, KazemEr, NuraySundu, Hayriye2021-06-232021-06-2320151550-79981550-2368https://doi.org/10.1103/PhysRevD.91.034026https://hdl.handle.net/20.500.12491/8438We study the semileptonic tree-level B -> (D) over bar transition in the framework of QCD sum rules in a nuclear medium. In particular, we calculate the in-medium form factors entering the transition matrix elements defining this decay channel. It is found that the interactions of the participating particles with the medium lead to a considerable suppression in the branching ratio compared to the vacuum.eninfo:eu-repo/semantics/closedAccessArticle10.1103/PhysRevD.91.0340269132-s2.0-84924325727N/AWOS:000350105700005Q2