Two-photon contribution to polarization in [ital K][sup +][r arrow][pi][sup +][mu][sup +][mu][sup [minus]]

Journal Article · Tue Dec 01 04:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.5026· OSTI ID:6912460

Lu, M; Wise, M B ^[1]; Savage, M J ^[2]

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1. California Institute of Technology, Pasadena, California 91125 (United States)
2. University of California at San Diego, La Jolla, California 92093-0319 (United States)

Short-distance physics involving virtual top and charm quarks contributes to [mu][sup +] (and [mu][sup [minus]]) polarization in the decay [ital K][sup +][r arrow][pi][sup +][mu][sup +][mu][sup [minus]]. Measurement of the parity-violating asymmetry ([Gamma][sub [ital R]][minus][Gamma][sub [ital L]])/([Gamma][sub [ital R]]+[Gamma][sub [ital L]]), where [Gamma][sub [ital R]] and [Gamma][sub [ital L]] are the rates to produce right- and left-handed [mu][sup +], may provide valuable information on the unitarity triangle. The parity-violating asymmetry also gets a contribution from Feynman diagrams with two-photon intermediate states. We estimate this two-photon contribution to the asymmetry and discuss briefly the two-photon contribution to time-reversal-odd asymmetries that involve both the [mu][sup +] and [mu][sup [minus]]polarizations.

• DOE Contract Number: AC03-81ER40050; FG03-90ER40546
• OSTI ID: 6912460
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:11; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662120 -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
ASYMMETRY
B MESONS
BEAUTY PARTICLES
BOSONS
CABIBBO ANGLE
CHARM PARTICLES
CP INVARIANCE
DECAY
DIAGRAMS
ELEMENTARY PARTICLES
FERMIONS
FEYNMAN DIAGRAM
FIELD THEORIES
HADRONS
INVARIANCE PRINCIPLES
KAONS
KAONS PLUS
KOBAYASHI-MASKAWA MATRIX
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRICES
MATTER
MESONS
MUONS
MUONS MINUS
MUONS PLUS
P INVARIANCE
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PHOTONS
PIONS
PIONS PLUS
POLARIZED PRODUCTS
POSTULATED PARTICLES
PSEUDOSCALAR MESONS
QUARKS
STANDARD MODEL
STRANGE MESONS
STRANGE PARTICLES
TOP PARTICLES
UNIFIED GAUGE MODELS
UNIFIED-FIELD THEORIES
UNITARITY