Search for nucleon decay into lepton+K0final states using Soudan 2
Abstract
A search for nucleon decay into two-body final states containing ${K}^{0}$ mesons has been conducted using the 963 metric ton Soudan 2 iron tracking calorimeter. The topologies, ionizations, and kinematics of contained events recorded in a 5.52 kiloton-year total exposure (4.41 kton-year fiducial volume exposure) are examined for compatibility with nucleon decays in an iron medium. For proton decay into the fully visible final states ${\ensuremath{\mu}}^{+}{K}_{S}^{0}$ and ${e}^{+}{K}_{S}^{0},$ zero and one event candidates are observed respectively. The lifetime lower limits $(\ensuremath{\tau}/B)$ thus implied are $1.5\ifmmode\times\else\texttimes\fi{}{10}^{32}\mathrm{yr}$ and $1.2\ifmmode\times\else\texttimes\fi{}{10}^{32}\mathrm{yr},$ respectively. Lifetime lower limits are also reported for proton decay into ${l}^{+}{K}_{l}^{0},$ and for neutron decay into $\ensuremath{\nu}{K}_{S}^{0}.$
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