Search for the Proton Decay Mode proton to neutrino K+ in Soudan 2
The Soudan 2 collaboration
Abstract
We have searched for the proton decay mode proton to neutrino K+ using the one-kiloton Soudan 2 high resolution calorimeter. Contained events obtained from a 3.56 kiloton-year fiducial exposure through June 1997 are examined for occurrence of a visible K+ track which decays at rest into mu+ nu or pi+ pi0. We found one candidate event consistent with background, yielding a limit, tau/B > 4.3 1031 years at 90% CL with no background subtraction.
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