Branching Fractions And Cp Asymmetries In B-0 ->Pi(0)Pi(0), B+->Pi(+)Pi(0), And B+-> K+Pi(0) Decays And Isospin Analysis Of The B ->Pi Pi System
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PHYSICAL REVIEW LETTERS（2005）
Cited 68|Views385
Abstract
Based on a sample of 227x10(6) B(B) over bar pairs collected by the BABAR detector at the PEP-II asymmetric-energy B Factory at SLAC, we measure the branching fraction B(B-0 ->pi(0)pi(0))=(1.17 +/- 0.32 +/- 0.10)x10(-6), and the asymmetry C-pi(0)pi(0)=-0.12 +/- 0.56 +/- 0.06. The B-0 ->pi(0)pi(0) signal has a significance of 5.0 sigma. We also measure B(B+->pi(+)pi(0))=(5.8 +/- 0.6 +/- 0.4)x10(-6), B(B+-> K+pi(0))=(12.0 +/- 0.7 +/- 0.6)x10(-6), and the charge asymmetries A(pi)(+)pi(0)=-0.01 +/- 0.10 +/- 0.02 and A(K)(+)pi(0)=0.06 +/- 0.06 +/- 0.01. Using isospin relations, we find an upper bound on the angle difference vertical bar alpha-alpha(eff)vertical bar of 35 degrees at the 90% C.L.
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Key words
elementary particles,standard model,upper bound
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