Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-11-29
Z.Phys.C74:359-368,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
25 pages (Latex), 5 PS figs (uuencoded, epsf.tex)
Scientific paper
10.1007/s002880050398
We study the influence of penguin (especially, electroweak penguin) effects on some methods of measuring the angles $\alpha$, $\beta$, and $\gamma$ in the CKM unitarity triangle. We use next-to-leading order effective Hamiltonian, and present numerical estimates based on the factorization approximation. We find that some techniques suggested in the literature, especially for $\alpha$ determination, are not workable in light of the electroweak penguin effects. Nevertheless, there are methods that would work for each angle determination. For angle $\beta$ we consider $B \rightarrow D^{+} D^{-}$ mode and estimate the penguin contamination. For angle $\gamma$ we consider a method based on SU(3) symmetry and carefully consider SU(3) breaking effects. We point out regions in the parameter space where this method could be used reliably.
Deshpande Nilendra G.
He Xiao-Gang
Oh Sechul
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