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

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

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


Positron asymmetry in the decay of muons produced in K++ has been precisely measured in a search for right-handed currents. A novel technique utilizing a K2 muon beam from the at-rest decay of positive kaons in a primary-proton-beam target was employed. A limit of P>0.990 (90% C.L.) was obtained from the energy-integrated positron asymmetry observed in muon spin precession under a transverse magnetic field. This limit sets a new constraint on the mass of a second weak boson (MW2) as well as on the Cabibbo angle of the right-handed sector.

Original languageEnglish
Pages (from-to)877-880
Number of pages4
JournalPhysical review letters
Issue number6
Publication statusPublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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