; Lu Yuan-Long
; Xiong Zhao-Hua] Beijing Univ Technol, Coll Appl Sci, Inst Theoret Phys, Beijing 100022, Peoples R China
; [Yang Min] Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China
We evaluate the rare decays B-s -> l(+)l(-) in the standard model, considering the off-shell effect of quarks in B-s meson as well as some contributions neglected in previous works. It is found that the quarks off-shell are large. With the predicted branching ratios at order of 10(-8), it is expected that the radiative dileptonic decays will be detected in the LHC-b experiments.