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A search for the decay B+→K+ννˉB^+ \to K^+ \nu \bar{\nu}

Collaboration
Nov, 2004
7 pages
Published in:
  • Phys.Rev.Lett. 94 (2005) 101801
e-Print:
DOI:
Report number:
  • SLAC-PUB-10860,
  • BABAR-PUB-04-036
Experiments:
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Abstract:
We search for the rare flavor-changing neutral-current decay B+→K+ννˉB^+ \to K^+ \nu \bar{\nu} in a data sample of 82 fb−1^{-1} collected with the {\sl BABAR} detector at the PEP-II B-factory. Signal events are selected by examining the properties of the system recoiling against either a reconstructed hadronic or semileptonic charged-B decay. Using these two independent samples we obtain a combined limit of B(B+→K+ννˉ)<5.2×10−5{\mathcal B}(B^+ \to K^+ \nu \bar{\nu})<5.2 \times 10^{-5} at the 90% confidence level. In addition, by selecting for pions rather than kaons, we obtain a limit of B(B+→π+ννˉ)<1.0×10−4{\mathcal B}(B^+ \to \pi^+ \nu \bar{\nu})<1.0 \times 10^{-4} using only the hadronic B reconstruction method.
  • 13.20.He
  • 12.15.Mm
  • B mesons
  • semileptonic decays
  • neutral currents
  • electron positron: colliding beams
  • electron positron: annihilation
  • Upsilon(10570): electroproduction
  • B: pair production
  • B+: rare decay