DPF99 - Observation of the decay $K^+\to \pi^+ \nu \bar\nu$

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Author: Milind V. Diwan

Title: Observation of the decay $K^+\to \pi^+ \nu \bar\nu$

Abstract: We have observed 1 event consistent with the signature expected of the rare decay of a positive kaon to a positive pion and a neutrino anti-neutrino pair. In the examined momentum region of 211 to 230 MeV/c in the center of mass of the kaon we estimated the backgrounds to be about $0.08 \pm 0.03$ events.From this observation we estimate the branching ratio to be $4.2^{+9.7}_{-3.5} \times 10^{-10}$. In this presentation I will explain the experiment, and the analysis techniques. I will also discuss the expected improvements in the near future from the analysis of new data sets.

Comments: 7 pages, 5 figure files, REVTEX, Proceedings of the Division of Particles and Fields Conference 1999, Jan 5-9, University of California, Los Angeles. Report-no:Subj-class: hep-exJournal-ref:

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DPF99