Search for right-handed currents in the decay chain of K++, +e+e

M. Aoki, T. Yamazaki, J. Imazato, Y. Kawashima, K. H. Tanaka, M. Takasaki, R. S. Hayano, M. Iwasaki, H. Outa, E. Takada, H. Tamura

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8 Citations (Scopus)


The asymmetry of positrons in the K++, +e+e decay chain was measured in a search for right-handed weak currents in S=1 semileptonic decay. High-intensity low-background monoenergetic polarized muons of 236 MeV/c momentum resulting from kaon decay at rest were directly extracted from a primary production target which was hit by a proton beam of the KEK 12-GeV proton synchrotron. Muons were stopped in a pure-aluminum plate, and the energy-integrated asymmetry of the decay positrons with respect to the incoming muon direction was determined to high precision. The observed asymmetry yielded P=-0.99960.0030(stat)0.0048(syst) . This result revealed no evidence of right-handed currents in this kaon-decay chain, and set a stringent bound on the mass of the right-handed weak boson.

Original languageEnglish
Pages (from-to)69-91
Number of pages23
JournalPhysical Review D
Issue number1
Publication statusPublished - 1994


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