Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-07-06
Physics
High Energy Physics
High Energy Physics - Phenomenology
CERN-TH.7207/94, Invited lecture given at the VIII Rencontres de Physique de la Vallee d'Aoste, La Thuile, March 1994, 17 page
Scientific paper
The Standard Model contains a natural source for CP asymmetries in weak decays, which is described by the KM mechanism. Beyond $\epsilon _K$ it generates only elusive manifestations of CP violation in {\em light-}quark systems. On the other hand it naturally leads to large asymmetries in certain non-leptonic beauty decays. In particular when $B^0-\bar B^0$ oscillations are involved, theoretical uncertainties in the hadronic matrix elements either drop out or can be controlled, and one predicts asymmetries well in excess of 10\% with high parametric reliability. It is briefly described how the KM triangle can be determined experimentally and then subjected to sensitive consistency tests. Any failure would constitute indirect, but unequivocal evidence for the intervention of New Physics; some examples are sketched. Any outcome of a comprehensive program of CP studies in $B$ decays -- short of technical failure -- will provide us with fundamental and unique insights into nature's design.
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