Improving Bounds on Penguin Pollution in B -> pi pi
High Energy Physics - Phenomenology
2014-11-17 v2 High Energy Physics - Experiment
Abstract
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.
Keywords
Cite
@article{arxiv.hep-ph/0105308,
title = {Improving Bounds on Penguin Pollution in B -> pi pi},
author = {Michael Gronau and David London and Nita Sinha and Rahul Sinha},
journal= {arXiv preprint arXiv:hep-ph/0105308},
year = {2014}
}
Comments
10 pages, LaTeX, 3 figures. Abstract modified slightly. Submitted to Physics Letters