$B \to D_s π$ and the tree amplitude in $B \to π^+ π^-$

Details $B \to D_s π$ and the tree amplitude in $B \to π^+ π^-$ $B \to D_s π$ and the tree amplitude in $B \to π^+ π^-$

2002-06-02

arxiv.org/abs/hep-ph/0206006v1

Phys.Rev. D66 (2002) 057503

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, LaTeX, 1 figure, to be submitted to Phys. Rev. D (Brief Reports)

Scientific paper

10.1103/PhysRevD.66.057503

The recently-observed decay $B^0 \to D_s^+ \pi^-$ is expected to proceed mainly by means of a tree amplitude in the factorization limit: $B^0 \to \pi^- {(W^+)}^*$, ${(W^+)}^* \to D_s^+$. Under this assumption, we predict the corresponding contribution of the tree amplitude to $B^0 \to \pi^+ \pi^-$. We indicate the needed improvements in data that will allow a useful estimate of this amplitude with errors comparable to those accompanying other methods. Since the factorization hypothesis for this process goes beyond that proved in most approaches, we also discuss independent tests of this hypothesis.

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