Search for proton decay via p→νK+ using 260 kiloton·year data of Super-Kamiokande

We have searched for proton decayvia p→νK+ using Super-Kamiokandedata from April 1996 to February 2013, 260 kiloton•year exposure in total. No evidence for this proton decaymode is found. A lower limit of the protonlifetime is set to τ/B(p→νK+)>5.9×1033 years at 90% confidence level.