B → Kπ decays and the weak phase angle γ
Abstract
The large branching ratios for B → Kπ decays as observed by the CLEO Collaboration indicate that penguin interactions contribute a major part to the decay rates and provide an interference between the Cabibbosuppressed tree and penguin contributions resulting in a CPasymmetry between the B → Kπ and its charge conjugate mode. The CPaveraged decay rates depend also on the weak phase γ and give us a determination of this phase. In this talk, I would like to report on a recent analysis of B → Kπ decays using factorisation model with final state interaction phase shift included. We find that factorisation seems to describe qualitatively the latest CLEO data. We also obtain a relation for the branching ratios independent of the strength of the strong penguin interactions. This relation gives a central value of 0.60 × 10 ^{5} for B( B¯^{0} → K¯^{0}π ^{0}), somewhat smaller than the latest CLEO measurement. We also find that a ratio obtained from the CPaveraged B → Kπ decay rates could be used to test the factorisation model and to determine the weak angle γ with more precise data, though the latest CLEO data seem to favor γ in the range 90°  120°.
 Publication:

Nuclear Physics B Proceedings Supplements
 Pub Date:
 April 2001
 DOI:
 10.1016/S09205632(01)011677
 arXiv:
 arXiv:hepph/0009142
 Bibcode:
 2001NuPhS..96..467P
 Keywords:

 High Energy Physics  Phenomenology
 EPrint:
 Talk given at the QCD Euroconference 00, Montpellier 612 July 2000, 10 pages,4 figures