Search for right-handed currents in the decay chain of [ital K][sup +][r arrow][mu][sup +][nu][sub [mu]], [mu][sup +][r arrow][ital e][sup +][nu][sub [ital e]][bar [nu]][sub [mu]]

Journal Article · Fri Jul 01 04:00:00 EDT 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.50.69· OSTI ID:7042214

Aoki, M; Yamazaki, T ^[1]; Imazato, J; Kawashima, Y; Tanaka, K H; Takasaki, M ^[2]; Hayano, R S; Iwasaki, M; Outa, H; Takada, E; Tamura, H ^[3]

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1. Institute for Nuclear Study, University of Tokyo, Tanashi-shi, Tokyo 188 (Japan)
2. National Laboratory for High Energy Physics (KEK), Tsukuba-shi, Ibaraki-ken 305 (Japan)
3. Department of Physics and Meson Science Laboratory, University of Tokyo, Bunkyo-ku, Tokyo 113 (Japan)

The asymmetry of positrons in the [ital K][sup +][r arrow][mu][sup +][nu], [mu][sup +][r arrow][ital e][sup +][nu][sub [ital e]][bar [nu]][sub [mu]] decay chain was measured in a search for right-handed weak currents in [Delta][ital S]=1 semileptonic decay. High-intensity low-background monoenergetic polarized muons of 236 MeV/[ital 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 [xi][ital P][sub [mu]]=[minus]0.9996[plus minus]0.0030(stat)[plus minus]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.

• OSTI ID: 7042214
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 50:1; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662210 -- Specific Theories & Interaction Models
662350* -- Decays of Mesons-- (1992-)
662370 -- Decays of Leptons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTINEUTRINOS
ANTIPARTICLES
ASYMMETRY
BASIC INTERACTIONS
BOSONS
DECAY
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
KAONS
KAONS PLUS
LEPTONIC DECAY
LEPTONS
MASSLESS PARTICLES
MATTER
MESONS
MUON ANTINEUTRINOS
MUON NEUTRINOS
MUONS
MUONS PLUS
NEUTRINOS
PARTICLE DECAY
POSITRONS
PSEUDOSCALAR MESONS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SEMILEPTONIC DECAY
STRANGE MESONS
STRANGE PARTICLES
V-A THEORY
WEAK INTERACTIONS
WEAK PARTICLE DECAY