Search for right-handed currents by means of muon spin rotation
A muon spin rotation (..mu..SR) technique has been used to place limits on right-handed weak currents in ..mu../sup +/ decay. A beam of almost 100% polarized 'surface' muons obtained from the TRIUMF M13 beamline was stopped in essentially non-depolarizing >99.99% pure metal foils. The ..mu../sup +/ spins were precessed by 70-G or 110-G transverse fields. Decay e/sup +/ emitted within 225 mrad of the beam direction and with momenta above 46 MeV/c were momentum-analyzed to 0.2%. Comparison of the ..mu..SR signal amplitude with that expected for (V-A) decay yields an endpoint asymmetry xiP..mu..delta/rho>0.9951 with 90% confidence. In the context of manifest left-right symmetric models with massless neutrinos the results imply the 90% confidence limits M(W/sub 2/)>381 GeV/c/sup 2/ and -0.057<0.044, where W/sub 2/ is a predominantly right-handed gauge boson and zeta is the left-right mixing angle. Limits on M(W/sub 2/) for M(nu/sub ..mu..R) is not equal to 0 are also presented. The endpoint asymmetry is used to deduce limits on the nu/sub nu/sub ..mu..L/ mass and helicity in ..pi../sup +/ decay, non-(V-A) couplings in helicity projection form, and the mass scale of composite leptons.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 5008431
- Report Number(s):
- LBL-20324; ON: DE86002870
- Resource Relation:
- Other Information: Thesis
- Country of Publication:
- United States
- Language:
- English
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Search for right-handed currents in muon decay
Search for right-handed currents in muon decay
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CURRENTS
ASYMMETRY
LEPTONIC DECAY
MUONS PLUS
CORRECTIONS
DATA ANALYSIS
EXPERIMENTAL DATA
INTERMEDIATE VECTOR BOSONS
LIFETIME
LINEAR MOMENTUM
NEUTRINOS
POSITRONS
REST MASS
SPIN-SPIN RELAXATION
TRIUMF CYCLOTRON
ACCELERATORS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BASIC INTERACTIONS
BOSONS
CYCLIC ACCELERATORS
CYCLOTRONS
DATA
DECAY
ELEMENTARY PARTICLES
FERMIONS
INFORMATION
INTERACTIONS
INTERMEDIATE BOSONS
ISOCHRONOUS CYCLOTRONS
LEPTONS
MASS
MASSLESS PARTICLES
MUONS
NUMERICAL DATA
PARTICLE DECAY
RELAXATION
WEAK INTERACTIONS
WEAK PARTICLE DECAY
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties