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Title: Observation of B^{+} Meson Decays to a1(1260)^{+} K^{0} and B^{0} to a1(1260)^{-} K^{+}
Authors: The BABAR Collaboration, B. Aubert et al.
Comments: 7 pages, 2 postscript figures.
Report-no: BABAR-PUB-07/056, SLAC-PUB-12826
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We present branching fraction measurements of the decays B^{+} -> a1(1260)^{+} K^{0} and
B^{0} to a1(1260)^{-} K^{+} with a1(1260)^{+} -> pi^{-} pi^{+} pi^{+}. The data sample
corresponds to 383 million B B-bar pairs produced in e^{+} e^{-} annihilation through the Y(4S)
resonance. We measure the products of the branching fractions:
B(B^{+}-> a1(1260)^{+} K^{0})B(a1(1260)^{+} -> pi^{-} pi^{+} pi^{+}) = (17.4 +/- 2.5 +/- 2.2) 10^{-6}
B(B^{0}-> a1(1260)^{-} K^{+})B(a1(1260)^{-} -> pi^{+} pi^{-} pi^{-}) = ( 8.2 +/- 1.5 +/- 1.2) 10^{-6}.
We also measure the charge asymmetries A_{ch}(B^{+} -> a1(1260)^{+} K^{0})= 0.12 +/- 0.11 +/- 0.02
and A_{ch}(B^{0} -> a1(1260)^{-} K^{+})= -0.16 +/- 0.12 +/- 0.01. The first uncertainty quoted is
statistical and the second is systematic.
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