JOURNAL OF HIGH ENERGY PHYSICS, no.8, 2012 (SCI-Expanded)
We study the decay modes (B) over bar (s) phi pi(0) and (B) over bar (s) phi rho(0) using Soft Collinear Effective Theory. Within Standard Model and including the error due to the SU(3) breaking effect in the SCET parameters we find that BR (B) over bar (s) phi pi(0) =7(-1-2)(+1+2) x 10(-8) and BR (B) over bar (s) -> phi pi(0) = 9(-1-4)(+1+3) corresponding to solution 1 and solution 2 of the SCET parameters respectively. For the decay mode (B) over bar (s) phi rho(0), we find that BR (B) over bar (s) phi rho(0) = 20.2(-1-12)(+1+9) x 10(-8) and BR (B) over bar (s) phi rho(0) = 34.0(-1.5-22)(+1.5+15) x 10(-8) corresponding to solution 1 and solution 2 of the SCET parameters respectively. We extend our study to include supersymmetric models with non- universal A- terms where the dominant contributions arise from diagrams mediated by gluino and chargino exchanges. We show that gluino contributions can not lead to an enhancement of the branching ratios of (B) over bar (s) -> phi pi(0) and (B) over bar (s) -> phi rho(0) In addition, we show that SUSY contributions mediated by chargino exchange can enhance the branching ratio of (B) over bar (s) -> phi pi(0) by about 14% with respect to the SM prediction. For the branching ratio of (B) over bar (s) -> phi rho(0), we find that SUSY contributions can enhance its value by about 1% with respect to the SM prediction.