Determining the sign of the b-->sgamma amplitude

Phys Rev Lett. 2005 Feb 18;94(6):061803. doi: 10.1103/PhysRevLett.94.061803. Epub 2005 Feb 17.

Abstract

The latest Belle and BABAR measurements of the inclusive B -->Xsl+l- branching ratio have smaller errors and lower central values than the previous ones. We point out that these results indicate that the sign of the b-->sgamma amplitude is the same as in the standard model. This underscores the importance of B -->Xsl+l- in searches for new physics, and may be relevant for neutralino-dark matter analyses within the minimal supersymmetric standard model.