Using B_s^0 Decays to Determine the CP Angles \alpha and \gamma
Abstract
Dighe, Gronau and Rosner have shown that, by assuming SU(3) flavor symmetry and first-order SU(3) breaking, it is possible to extract the CP angles \alpha and \gamma from measurements of the decay rates of B_d^0(t) --> \pi^+\pi^-, B_d^0 --> \pi^- K^+ and B^+ --> \pi^+ K^0, along with their charge-conjugate processes. We extend their analysis to include the SU(3)-related decays B_s^0 --> \pi^+ K^-, B_s^0(t) --> K^+ K^- and B_s^0 --> K^0 {\bar K^0}. There are several advantages to this extension: discrete ambiguities are removed, fewer assumptions are necessary, and the method works even if all strong phases vanish. In addition, we show that \gamma can be obtained cleanly, with no penguin contamination, by using the two decays B_s^0(t) --> K^+ K^- and B_s^0 --> K^0 {\bar K^0}.
Cite
@article{arxiv.hep-ph/9708356,
title = {Using B_s^0 Decays to Determine the CP Angles \alpha and \gamma},
author = {C. S. Kim and D. London and T. Yoshikawa},
journal= {arXiv preprint arXiv:hep-ph/9708356},
year = {2011}
}
Comments
28 pages, LaTeX