The CP-Conserving Direction

Details The CP-Conserving Direction The CP-Conserving Direction

1998-07-20

arxiv.org/abs/hep-ph/9807430v2

JHEP 9906 (1999) 032

Physics

High Energy Physics

High Energy Physics - Phenomenology

12 pages, no figure. Version to appear in JHEP

Scientific paper

10.1088/1126-6708/1999/06/032

A symmetry transformation is well defined in the case of an invariant theory, being the corresponding operator undetermined otherwise. However, we show that, even with CP violation, it is possible to determine the CP transformation by separating the Lagrangian of the Standard Model in a CP-conserving and a CP-violating part, in a unique way, making use of the empirically known quark mixing hierarchy. To order \lambda^3 for the Bd-system, the CP-conserving direction matches one of the sides of the (bd) unitarity triangle. We use this determination to calculate the rephasing invariant parameter \epsilon, which measures CP-mixing in the B0-B0bar system.

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