Further Evidence for the Decay K+ -> pi+ nu nubar
Akira Konaka
TRIUMF

Abstract
K+ -> pi+ nu nubar is very sensitive to the coupling of top to down quarks, |V_td|. Measurement of this branching ratio provides theoretically clean determination of |V_td|. Additional evidence for the K+ -> pi+ nu nubar has been found in a new data set taken in 1998 with a comparable sensitivity to that of all data taken previously.