Improved Measurement of the CKM Angle alpha Using B0->rho+rho- Decays
High Energy Physics - Experiment
2010-03-19 v2
Abstract
We present results from an analysis of B0 -> rho+rho- using 232 million Upsilon(4S) decays collected with the BABAR detector at the PEP-II asymmetric-energy Factory at SLAC. We measure the longitudinal polarization fraction f_L = 0.978 +- 0.014 (stat) +0.021 -0.029 (syst) and the CP-violating parameters SLong = -0.33 +- 0.24 (stat) +0.08 -0.14 (syst) and CLong = -0.03 +- 0.18 (stat) +- 0.09 (syst). Using an isospin analysis of B -> rho rho decays we determine the unitarity triangle alpha. The solution compatible with the Standard Model is alpha = (100 +- 13) degrees.
Keywords
Cite
@article{arxiv.hep-ex/0503049,
title = {Improved Measurement of the CKM Angle alpha Using B0->rho+rho- Decays},
author = {BABAR Collaboration and B. Aubert},
journal= {arXiv preprint arXiv:hep-ex/0503049},
year = {2010}
}
Comments
3 figures, 7 pages