Towards a Generic Parametrisation of "New Physics" in Quark-Flavour Mixing

Details Towards a Generic Parametrisation of "New Physics" in Quark-Flavour Mixing Towards a Generic Parametrisation of "New Physics" in Quark-Flavour Mixing

2003-06-05

arxiv.org/abs/hep-ph/0306043v1

Phys.Rev.D68:095002,2003

Physics

High Energy Physics

High Energy Physics - Phenomenology

Latex, 23 pages. The complete paper is also available via the www at http://www-ttp.physik.uni-karlsruhe.de/Preprints/

Scientific paper

10.1103/PhysRevD.68.095002

We consider a special class of dimension-six operators which are assumed to be induced by some new physics with typical scales of order \Lambda. This special class are the operators with two quarks which can mediate transitions between quark flavours. We show that under quite general assumptions the effect of these operators can be parametrised in terms of six parameters, leading to a modification of the (at tree level flavour diagonal) neutral currents and to an ``effective CKM matrix'' for the charged currents, which is not necessarily unitary any more. The effects of these operators on charged and neutral currents are studied.

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