Search for the Decay $K^+ \to π^+ ν\overlineν$

Details Search for the Decay $K^+ \to π^+ ν\overlineν$ Search for the Decay $K^+ \to π^+ ν\overlineν$

1995-10-18

arxiv.org/abs/hep-ex/9510006v1

Phys.Rev.Lett.76:1421-1424,1996

Physics

High Energy Physics

High Energy Physics - Experiment

uuencoded, compressed postscript, 9 pages

Scientific paper

10.1103/PhysRevLett.76.1421

An upper limit on the branching ratio for the decay $K^+ \! \rightarrow \! \pi^+ \nu \overline{\nu}$ is set at $2.4 \times 10^{-9}$ at the 90\% C.L. using pions in the kinematic region $214~{\rm MeV}/c < P_\pi < 231~{\rm MeV}/c$. An upper limit of $5.2 \times 10^{-10}$ is found on the branching ratio for decays $K^+ \! \rightarrow \! \pi^+ X^0$, where $X^0$ is any massless, weakly interacting neutral particle. Limits are also set for cases where $M_{X^0}>0$.

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