https://www.psi.ir/physics_society_iran_1_homeIranian Journal of Physics Research1682-695721420220220The study of decay with the calculation of its branching ratioThe study of decay with the calculation of its branching ratio701705175610.47176/ijpr.21.4.21181FAAAbdi SarayDepartment of Physics, Faculty of Science, Urmia University, Urmia, Iran0000-0001-9797-1994NBakhshiDepartment of Physics, Faculty of Science, Urmia University, Urmia, IranBMohammadiDepartment of Physics, Faculty of Science, Urmia University, Urmia, IranJournal Article20201228In this paper, the decay of the meson into two vector mesons and is investigated.The first observation of the decay was reported in 2017 by LHCb collaboration, they have obtained the value of B () = (5. 01 ± 053 ± 0.27 ± 0.06)×10<sup>-4</sup>. In this study, the Feynman diagram of decay is drawn based on the standard model. In particular this diagram shows that the decay consists of tree-exchange internal w-emission graph and penguin- suppressed graph. The coefficients of a<sub>2</sub>, a<sub>3</sub>, a<sub>5</sub> and a<sub>7</sub> are calculated in the NLO scale. The branching ratio is calculated using the QCD factorization method, numerical values in the NLO (at m<sub>b</sub> scale) scheme is 5.33×10<sup>-4</sup>, for which are in good agreement with the experimental results. The more calculations accuracy increases, the b quark mass scales come down corresponding to that. The best answer close to the experimental value is in NLO scheme at m<sub>b</sub> scale of QCDF approach.In this paper, the decay of the meson into two vector mesons and is investigated.The first observation of the decay was reported in 2017 by LHCb collaboration, they have obtained the value of B () = (5. 01 ± 053 ± 0.27 ± 0.06)×10<sup>-4</sup>. In this study, the Feynman diagram of decay is drawn based on the standard model. In particular this diagram shows that the decay consists of tree-exchange internal w-emission graph and penguin- suppressed graph. The coefficients of a<sub>2</sub>, a<sub>3</sub>, a<sub>5</sub> and a<sub>7</sub> are calculated in the NLO scale. The branching ratio is calculated using the QCD factorization method, numerical values in the NLO (at m<sub>b</sub> scale) scheme is 5.33×10<sup>-4</sup>, for which are in good agreement with the experimental results. The more calculations accuracy increases, the b quark mass scales come down corresponding to that. The best answer close to the experimental value is in NLO scheme at m<sub>b</sub> scale of QCDF approach.https://ijpr.iut.ac.ir/article_1756_1fb91f3bf77f0bacc6c29c80df4b540a.pdf