Matching of gauge invariant dimension 6 operators for $b\to s$ and $b\to c$ transitions

Abstract

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 article, we study the matching of the $SU(3{)}_C\times SU(2{)}_L\times U(1{)}_Y$ gauge invariant dim-6 operators on the standard $B$ physics Hamiltonian relevant for $b\to s$ and $b\to c$ 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 carry 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 identify those gauge invariant operators that do not enter $b\to s$ transitions already at tree level, but can give relevant one-loop matching effects.

arXiv comment33 pages, 3 figures. Eqs. (3.13), (4.24)-(4.26) corrected

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