PS03 CP Violation
CP violation in B decays within QCD factorization
Ludwig-Maximilians-Universität München, Sektion Physik, Theresienstraße 37, D-80333 Munich, Germany
Accepted: 22 November 2003
Published online: 9 April 2004
We analyze the extraction of weak phases from CP violation in B→π + π – decays. By combining the information on mixing induced CP violation in B→π + π –, namely S π π , with the precision observable obtained from the “gold-plated”mode B→ψ K S , we propose the determination of the unitarity triangle. We also discuss alternative ways to analyze S π π which can be useful if new physics affects B d – mixing. Predictions and uncertainties for r and φ in QCD factorization are examined in detail. It is pointed out that a simultaneous expansion in 1/m b and 1/N C leads to interesting simplifications. At first order infrared divergences are absent, while the most important effects are retained. Independent experimental tests of the factorization framework are briefly discussed.
PACS: 11.30.Er – 12.15.Hh – 13.25.Hw
© Società Italiana di Fisica, Springer-Verlag, 2004