[Bfys-physics] LHCb evidence for Bs->mumu

Dear friends,

This morning a preprint was submitted to the arXiv with first (3.5 sigma) evidence of the decay Bs->mumu as well as a first determination of the branching ratio. I am particularly proud of this result since our Nikhef group has made central contributions to: * Theory: together with our Nikhef theory friends we addressed the time integrated vs "t=0" BR. * fs/fd fragmentation: a leading systematic input for the Bs->mumu BR extraction * the selection and background study for Bs->mumu. Congratulations to all people involved!

Cheers, - Marcel