# Evidence for charged B meson decays to $a^pm_1(1260) \pi^0$ and $a^0_1(1260) \pi^pm$

Abstract : We present measurements of the branching fractions for the decays B+/- --> a1(1260)+/- pi0 and B+/- --> a1(1260)0 pi+/- from a data sample of 232 * 10^6 BB pairs produced in e+e- annihilation through the Y(4S) resonance. We measure the branching fraction B(B+/- --> a1(1260)+/- pi0) * B(a1(1260)+/- --> pi- pi+ pi+/-) = (13.2 +/- 2.7 +/- 2.1) * 10^-6 with a significance of 4.2 sigma, and the branching fraction B(B+/- --> a1(1260)0 pi+/-) * B(a1(1260)0 --> pi- pi+ pi0) = (20.4 +/- 4.7 +/- 3.4) * 10^-6 with a significance of 3.8 sigma, where the first error quoted is statistical and the second is systematic.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-00169741
Contributor : Claudine Bombar <>
Submitted on : Tuesday, September 4, 2007 - 4:54:02 PM
Last modification on : Wednesday, April 21, 2021 - 8:36:02 AM

### Citation

B. Aubert, M. Bona, D. Boutigny, Y. Karyotakis, J.P. Lees, et al.. Evidence for charged B meson decays to $a^pm_1(1260) \pi^0$ and $a^0_1(1260) \pi^pm$. Physical Review Letters, American Physical Society, 2007, 99, pp.261801. ⟨10.1103/PhysRevLett.99.261801⟩. ⟨in2p3-00169741⟩

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