Speaker
Jason Aebischer
(University of Bern)
Description
New physics realized above the electroweak scale can be encoded in a model
independent way in the Wilson coefficients of higher dimensional operators
which are invariant under the Standard Model gauge group. In this talk, I
present the matching of the SU(3)C × SU(2)L × U(1)Y gauge invariant dim-6
operators on the standard B physics Hamiltonian relevant for b → s
and b → c transitions. The matching is performed at the electroweak
scale (after spontaneous symmetry breaking) by integrating out the top
quark, W, Z and the Higgs particle. We first carried out the matching of
the dim-6 operators that give a contribution at tree level to the low
energy Hamiltonian. In a second step, we identified those gauge invariant
operators that do not enter b → s transitions already at tree level,
but can give relevant one-loop matching effects.
