Search for the Rare Decay B to J/Psi gamma
------------------------------------------

Sheila MacLachlin McGill University  BaBar Collaboration IPP Canada  - 

With the advent of the B-factories at SLAC and KEK, it is now possible
to investigate some very rare processes to probe Physics beyond the
Standard Model. I will present the results of a search for the rare
decay B0 to J/Psi gamma conducted at the BaBar experiment.  The data
set used an integrated luminosity of 125 fb-1. Current theoretical
estimates, using leading order Feynman annihilation diagrams suggest a
branching ratio of the order of 10^-8. The possibility of intrinsic
charm in the B0 meson will, of course, modify these estimates.