Observation of B0 Meson Decay to a1(1260)+- pi-+
High Energy Physics - Experiment
2010-03-19 v2
Abstract
We present a measurement of the branching fraction of the decay B0 --> a1(1260)^{+-} pi^{-+} with a1(1260)^{+-} --> pi^{-+} pi^{+-} pi^{+-}. The data sample consists of 218 million B B-bar pairs collected at the Y(4S) resonance and recorded by the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC. The analysis is based on unbinned multivariate maximum likelihood fit. The measured branching fraction is: (16.6 +/- 1.9 +/- 1.5) 10^{-6}. The decay mode, observed for the first time, is seen with a significance of 9.2 sigma (systematic uncertainties included).
Cite
@article{arxiv.hep-ex/0603050,
title = {Observation of B0 Meson Decay to a1(1260)+- pi-+},
author = {The BABAR Collaboration and B. Aubert},
journal= {arXiv preprint arXiv:hep-ex/0603050},
year = {2010}
}
Comments
7 pages, 2 postscript figures. Submitted to Phys. Rev. Lett