Scale-independent mixing angles

Details Scale-independent mixing angles Scale-independent mixing angles

2001-09-14

arxiv.org/abs/hep-ph/0109126v2

Phys.Rev. D66 (2002) 016004

Physics

High Energy Physics

High Energy Physics - Phenomenology

14 pages, 11 ps figures Version to appear in PRD

Scientific paper

10.1103/PhysRevD.66.016004

A radiatively-corrected mixing angle has to be independent of the choice of renormalization scale to be a physical observable. At one-loop in MS-bar, this only occurs for a particular value, p*, of the external momentum in the two-point functions used to define the mixing angle: p*^2=(M1^2+M2^2)/2, where M1, M2 are the physical masses of the two mixed particles. We examine two important applications of this to the Minimal Supersymmetric Standard Model: the mixing angle for a) neutral Higgs bosons and b) stops. We find that this choice of external momentum improves the scale independence (and therefore provides a more reliable determination) of these mixing angles.

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