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Observation of the decay B±→π±π0B^\pm \to \pi^\pm \pi^0, study of B±→K±π0B^\pm \to K^\pm \pi^0, and search for B0→π0π0B^0 \to \pi^0 \pi^0

Collaboration
Mar, 2003
7 pages
Published in:
  • Phys.Rev.Lett. 91 (2003) 021801
e-Print:
DOI:
Report number:
  • SLAC-PUB-9683,
  • BABAR-PUB-03-002
Experiments:
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Abstract:
We present results for the branching fractions and charge asymmetries in B±→h±π0B^{\pm} \to h^{\pm} \pi^{0} (where h±=π±,K±h^{\pm} = \pi^{\pm}, K^{\pm}) and a search for the decay B0→π0π0B^{0} \to \pi^{0} \pi^{0} using a sample of approximately 88 million BBˉB\bar{B} pairs collected by the BABAR detector at the PEP-II asymmetric-energy BB Factory at SLAC. We measure B(B±→π±π0)=(5.5−0.9+1.0±0.6)×10−6{\cal B} (B^{\pm} \to \pi^{\pm} \pi^{0}) = (5.5 ^{+1.0}_{-0.9} \pm 0.6) \times 10^{-6}, where the first error is statistical and the second is systematic. The B±→π±π0B^{\pm} \to \pi^{\pm} \pi^{0} signal has a significance of 7.7σ7.7 \sigma including systematic uncertainties. We simultaneously measure the K±π0K^{\pm}\pi^{0} branching fraction to be B(B±→K±π0)=(12.8−1.1+1.2±1.0)×10−6 {\cal B} (B^{\pm} \to K^{\pm} \pi^{0}) = (12.8 ^{+1.2}_{-1.1} \pm 1.0) \times 10^{-6}. The charge asymmetries are Aπ±π0=−0.03−0.17+0.18±0.02{\cal A}_{\pi^{\pm}\pi^{0}} = -0.03_{-0.17}^{+0.18} \pm 0.02 and AK±π0=−0.09±0.09±0.01{\cal A}_{K^{\pm}\pi^{0}} = -0.09 \pm 0.09 \pm 0.01. We place a 90% confidence-level upper limit on the branching fraction B(B0→π0π0){\cal B} (B^{0} \to \pi^{0} \pi^{0}) of 3.6×10−63.6 \times 10^{-6} .
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B: hadronic decay
  • meson: pair production
  • final state: (0charm)
  • B+: branching ratio
  • B0: branching ratio
  • upper limit