Evidence for charged B meson decays to a1(1260)+/- pi0 and a1(1260)0 pi+/-

Details Evidence for charged B meson decays to a1(1260)+/- pi0 and a1(1260)0 pi+/- Evidence for charged B meson decays to a1(1260)+/- pi0 and a1(1260)0 pi+/-

2007-07-31

arxiv.org/abs/0708.0050v3

Phys.Rev.Lett.99:261801,2007

Physics

High Energy Physics

High Energy Physics - Experiment

7 pages, 2 postscript figures; version published in Phys. Rev. Lett., minor typographical changes from version 2

Scientific paper

10.1103/PhysRevLett.99.261801

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.

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