# Observation of $B^0$ Meson Decay to $a^\pm_1(1260) \pi^\mp$

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).
Document type :
Journal articles

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Submitted on : Wednesday, January 17, 2007 - 10:42:08 AM
Last modification on : Sunday, June 26, 2022 - 11:45:58 AM

### Citation

B. Aubert, R. Barate, D. Boutigny, F. Couderc, y. Karyotakis, et al.. Observation of $B^0$ Meson Decay to $a^\pm_1(1260) \pi^\mp$. Physical Review Letters, American Physical Society, 2006, 97, pp.051802. ⟨10.1103/PhysRevLett.97.051802⟩. ⟨in2p3-00084367⟩

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