Search for the Decay K+ -> pi+ pi0 nu nubar
E787: S. Adler, M. Aoki, M. Ardebili, M.S. Atiya, P.C. Bergbusch, E.W., Blackmore, D.A. Bryman, I-H. Chiang, M.R. Convery, M.V. Diwan, J.S. Frank,, J.S. Haggerty, T. Inagaki, M.M. Ito, S. Kabe, S.H. Kettell, Y. Kishi, P., Kitching, M. Kobayashi, T.K. Komatsubara, A. Konaka
TL;DR
This paper reports the first experimental search for the rare decay K+ -> pi+ pi0 nu nubar, setting an upper limit on its branching ratio based on zero observed events in the specified kinematic region.
Contribution
It presents the first search for the decay K+ -> pi+ pi0 nu nubar and establishes an upper limit on its branching ratio using the E787 detector at BNL.
Findings
Zero events observed in the search region.
Upper limit on branching ratio set at 4.3 x 10^{-5}.
Provides constraints for theoretical models of rare kaon decays.
Abstract
The first search for the decay K^+ -> pi^+ pi^0 nu nubar has been performed with the E787 detector at BNL. Based on zero events observed in the kinematical search region defined by 90 MeV/c < P_{pi^+} < 188 MeV/c and 135 MeV < E_{pi^0} < 180 MeV, an upper limit B(K^+ -> pi^+ pi^0 nu nubar) < 4.3 x 10^{-5} at 90% confidence level is established.
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