Improving Bounds on Penguin Pollution in B -> pi pi

Details Improving Bounds on Penguin Pollution in B -> pi pi Improving Bounds on Penguin Pollution in B -> pi pi

2001-05-29

arxiv.org/abs/hep-ph/0105308v2

Phys.Lett. B514 (2001) 315-320

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, LaTeX, 3 figures. Abstract modified slightly. Submitted to Physics Letters

Scientific paper

10.1016/S0370-2693(01)00818-8

In the presence of penguin contributions, the indirect CP asymmetry in B0(t) -> pi+ pi- measures sin(2\alpha + 2\theta), where 2\theta parametrizes the size of the penguin ``pollution.'' We derive a new upper bound on |2\theta|, requiring the measurement of of BR(B+ -> pi+ pi0) and an upper bound on B00 \equiv {1\over 2} [BR(B0 -> pi0 pi0) + BR(B0bar -> pi0 pi0)]. The new bound is stronger than those previously discussed in the literature. We also present a lower bound on B00. Current data may suggest that it is not very small, in which case \theta can be determined using a complete isospin analysis.

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