Observation of the Decay $B^{\pm} \to π^{\pm}π^{0}$, Study of $B^{\pm} \to K^{\pm}π^{0}$, and Search for $B^{0} \to π^{0}π^{0}$

The BABAR Collaboration; B. Aubert

doi:10.1103/PhysRevLett.91.021801

paper

Observation of the Decay $B^{\pm} \to π^{\pm} π^{0}$ , Study of $B^{\pm} \to K^{\pm} π^{0}$ , and Search for $B^{0} \to π^{0} π^{0}$

arXiv:hep-ex/0303028 · doi:10.1103/PhysRevLett.91.021801

Abstract

We present results for the branching fractions and charge asymmetries in $B^{\pm} \to h^{\pm} π^{0}$ (where $h^{\pm} = π^{\pm}, K^{\pm}$ ) and a search for the decay $B^{0} \to π^{0} π^{0}$ using a sample of approximately 88 million $B B ˉ$ pairs collected by the BABAR detector at the PEP-II asymmetric-energy $B$ Factory at SLAC. We measure $B (B^{\pm} \to π^{\pm} π^{0}) = (5. 5_{- 0.9}^{+ 1.0} \pm 0.6) \times 1 0^{- 6}$ , where the first error is statistical and the second is systematic. The $B^{\pm} \to π^{\pm} π^{0}$ signal has a significance of $7.7 σ$ including systematic uncertainties. We simultaneously measure the $K^{\pm} π^{0}$ branching fraction to be $B (B^{\pm} \to K^{\pm} π^{0}) = (12. 8_{- 1.1}^{+ 1.2} \pm 1.0) \times 1 0^{- 6}$ . The charge asymmetries are $A_{π^{\pm} π^{0}} = - 0.0 3_{- 0.17}^{+ 0.18} \pm 0.02$ and $A_{K^{\pm} π^{0}} = - 0.09 \pm 0.09 \pm 0.01$ . We place a 90% confidence-level upper limit on the branching fraction $B (B^{0} \to π^{0} π^{0})$ of $3.6 \times 1 0^{- 6}$ .

arXiv comment7 pages, 8 postscript figues, submitted to Physical Review Letters

Observation of the Decay $B^{\pm} \to π^{\pm} π^{0}$ , Study of $B^{\pm} \to K^{\pm} π^{0}$ , and Search for $B^{0} \to π^{0} π^{0}$

Abstract

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Observation of the Decay $B^{\pm} \to π^{\pm} π^{0}$ , Study of $B^{\pm} \to K^{\pm} π^{0}$ , and Search for $B^{0} \to π^{0} π^{0}$