Search for right-handed currents in the decay chain K sup + r arrow. mu. sup +. nu. ,. mu. sup + r arrow e sup +. nu. nu

Journal Article · Mon Aug 10 04:00:00 EDT 1992 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.69.877· OSTI ID:7012121

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

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

Positron asymmetry in the decay of muons produced in {ital K}{sup +}{r arrow}{mu}{sup +}{nu} has been precisely measured in a search for right-handed currents. A novel technique utilizing a {ital K}{sub {mu}2} muon beam'' from the at-rest decay of positive kaons in a primary-proton-beam target was employed. A limit of {vert bar}{xi}{ital P}{sub {mu}}{vert bar}{gt}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 ({ital M}{sub {ital W}2}) as well as on the Cabibbo angle of the right-handed sector.

• OSTI ID: 7012121
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 69:6; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

662210 -- Specific Theories & Interaction Models
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCURACY
ANGULAR MOMENTUM
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
BASIC INTERACTIONS
BOSONS
CHIRAL SYMMETRY
DATA ANALYSIS
DECAY
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
KAONS
KAONS PLUS
LEPTONIC DECAY
LEPTONS
LIMITING VALUES
MAGNETIC FIELDS
MASS
MATTER
MESONS
MIXING
MUONS
MUONS PLUS
PARTICLE DECAY
PARTICLE PROPERTIES
PSEUDOSCALAR MESONS
Pa
Particle Systematics-- Unified Theories & Models-- (1992-)
SPIN
STRANGE MESONS
STRANGE PARTICLES
SYMMETRY
WEAK INTERACTIONS
WEAK PARTICLE DECAY