Updates on B  KX(3872) for BGM S. L. Olsen U of Hawaii S.-K. Choi Gyeongsang U

B 0  K s  ’

B -  K -  ’

Nev= M = ± 0.7MeV Signif. = 6.6  B ±  K ± X(3872); X      J/ 

Nev = M = ± 1.6 MeV Signif. = 2.6   M = 0.1 ± 1.7 MeV B 0  K s X(3872); X      J/ 

= N ev (B 0  K S X) N ev (B -  K - X) N ev (B 0  K S  ’) N ev (B -  K -  ’ )   (B -  K - X )  (B 0  K S X )  (B   K   ’ )  (B 0  K S  ’ )  from PDG Assume ~1 = Ratio of Branching fractions Br(B 0  K S X) Br(B   K  X) Br(B 0  K S  ’ ) Br(B   K   ’ ) Br(B 0  K S  ’ ) Br(B   K   ’ )

Roofit Result with peaking Background –Ratio of Branching Fractions – Mass difference  M = 0.1 ± 1.7 MeV Br(B 0  K S X) Br(B   K  X) = Br(B 0  K S  ’ ) Br(B   K   ’ )