Search for the violation of time-reversal invariance in K/sup 0//sub mu3/ decays

Journal Article · Tue Apr 01 04:00:00 EST 1980 · Phys. Rev., D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.21.1750· OSTI ID:5318816

Morse, W M; Leipuner, L B; Larsen, R C; Schmidt, M P; Blatt, S R; Campbell, M K; Grannan, D M; Lauterbach, M J; Kasha, H; Adair, R K

The transverse polarization of muons from the decay K/sup 0//sub L/ ..-->.. ..pi../sup -/..mu../sup +/..nu../sub ..mu../ has been recently measured at Brookhaven National Laboratory. A cylindrically symmetric detector was employed with scintillation-counter hodoscopes detecting the charged decay products of the in-flight kaon decay and determining the orientation of the decay plane in the laboratory. Muons were brought to rest in an aluminum polarimeter where they precessed in 60-G magnetic field. The muon polarization was determined from the asymmetric emission of the positron in the muon decay (..mu../sup +/ ..-->.. e/sup +/..nu../sub e/nu-bar/sub ..mu../). With 12 x 10/sup 6/ events collected the mean values measured for the two components of transverse polarization are P/sup lab//sub n/=0.0017 +- 0.0056 for the component normal to the decay plane and P/sup lab//sub t/=0.417 +- 0.063 for the component in the decay plane. For Imxi, where xi is the ratio of form factors describing K/sub mu3/ decay, we have deduced a value of 0.009 +- 0.030 which is not significantly different from the value 0.008, expected if time-reversal invariance is valid. We deduce that the average value of the ratio of the normal to transverse components of muon polarization in the kaon rest frame is given by < P/sub n//P/sub t/ > /sup c.m./=0.005 +- 0.015.

• Research Organization: Brookhaven National Laboratory, Upton, New York 11973
• OSTI ID: 5318816
• Journal Information: Phys. Rev., D; (United States), Journal Name: Phys. Rev., D; (United States) Vol. 21:7; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions &amp; Properties-Experimental-- Weak Interactions &amp; Properties
645302 -- High Energy Physics-- Particle Invariance Principles &amp; Symmetries-- Applications to Electromagnetic &amp; Weak Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
BOSONS
COMPOSITE MODELS
CP INVARIANCE
DECAY
ELEMENTARY PARTICLES
FERMIONS
FORM FACTORS
GAUGE INVARIANCE
HADRONS
HODOSCOPES
INVARIANCE PRINCIPLES
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
LEPTONS
LIE GROUPS
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
MESONS
MUONS
MUONS PLUS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PROPERTIES
POLARIZED PRODUCTS
POSITRONS
PSEUDOSCALAR MESONS
QUARK MODEL
RADIATION DETECTORS
SCINTILLATION COUNTERS
SEMILEPTONIC DECAY
STRANGE PARTICLES
SU GROUPS
SU-2 GROUPS
SYMMETRY GROUPS
T INVARIANCE
U GROUPS
U-1 GROUPS
WEAK PARTICLE DECAY