Supersymmetric penguin contributions to the process   \protect\protect\protect(B_{d}\longrightarrow \Phi K_{s}\protect \protect   \protect) in SUSY GUT with right-handed neutrino.}
  The (B_{d}\longrightarrow \Phi K_{s}) process is without tree level decay amplitude . Then the SUSY contributions may be significant . We calculate the neutralino and gluino penguin contributions to the CP violating phase in (SU(5) ) grand unified theory with right-handed neutrino (SU(5)_{RN}) . We find that the SUSY contribution may change the phase in (B_{d}\longrightarrow \Phi K_{s} ). 
Marie-Bernadette Causse