skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: 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]]

Abstract

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.

Authors:
;  [1]; ; ; ;  [2]; ; ; ; ;  [3]
  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))
Publication Date:
OSTI Identifier:
7042214
Alternate Identifier(s):
OSTI ID: 7042214
Resource Type:
Journal Article
Journal Name:
Physical Review, D (Particles Fields); (United States)
Additional Journal Information:
Journal Volume: 50:1; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Pa; KAONS PLUS; SEMILEPTONIC DECAY; LEPTONIC DECAY; POSITRONS; MUONS PLUS; ASYMMETRY; ELECTRON NEUTRINOS; MUON ANTINEUTRINOS; MUON NEUTRINOS; V-A THEORY; ANTILEPTONS; ANTIMATTER; ANTINEUTRINOS; ANTIPARTICLES; BASIC INTERACTIONS; BOSONS; DECAY; ELEMENTARY PARTICLES; FERMIONS; HADRONS; INTERACTIONS; KAONS; LEPTONS; MASSLESS PARTICLES; MATTER; MESONS; MUONS; NEUTRINOS; PARTICLE DECAY; PSEUDOSCALAR MESONS; STRANGE MESONS; STRANGE PARTICLES; WEAK INTERACTIONS; WEAK PARTICLE DECAY 662350* -- Decays of Mesons-- (1992-); 662210 -- Specific Theories & Interaction Models; Particle Systematics-- Unified Theories & Models-- (1992-); 662370 -- Decays of Leptons-- (1992-)

Citation Formats

Aoki, M., Yamazaki, T., Imazato, J., Kawashima, Y., Tanaka, K.H., Takasaki, M., Hayano, R.S., Iwasaki, M., Outa, H., Takada, E., and Tamura, H. 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]]. United States: N. p., 1994. Web. doi:10.1103/PhysRevD.50.69.
Aoki, M., Yamazaki, T., Imazato, J., Kawashima, Y., Tanaka, K.H., Takasaki, M., Hayano, R.S., Iwasaki, M., Outa, H., Takada, E., & Tamura, H. 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]]. United States. doi:10.1103/PhysRevD.50.69.
Aoki, M., Yamazaki, T., Imazato, J., Kawashima, Y., Tanaka, K.H., Takasaki, M., Hayano, R.S., Iwasaki, M., Outa, H., Takada, E., and Tamura, H. Fri . "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]]". United States. doi:10.1103/PhysRevD.50.69.
@article{osti_7042214,
title = {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]]},
author = {Aoki, M. and Yamazaki, T. and Imazato, J. and Kawashima, Y. and Tanaka, K.H. and Takasaki, M. and Hayano, R.S. and Iwasaki, M. and Outa, H. and Takada, E. and Tamura, H.},
abstractNote = {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.},
doi = {10.1103/PhysRevD.50.69},
journal = {Physical Review, D (Particles Fields); (United States)},
issn = {0556-2821},
number = ,
volume = 50:1,
place = {United States},
year = {1994},
month = {7}
}