Decay of the. eta. meson into. pi. mu. sup +. mu. sup minus

Journal Article · Mon Nov 30 23:00:00 EST 1992 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.46.5034· OSTI ID:7199766

Ng, J N; Peters, D J ^[1]

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1. Theory Group, TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 (Canada)

We calculate the unitarity bound for the decay of {eta}{r arrow}{pi}{sup 0}{ital l{bar l}} ({ital l}={ital e} or {mu}). The input parameters are the two transition form factors in the radiative decay of the {eta}{r arrow}{pi}{sup 0}{gamma}{gamma}. They are calculated using the vector-meson-dominance model plus the pseudoscalar {ital a}{sub 0} exchange. This yields a width which is lower than the measured rate of {eta}{r arrow}{pi}{sup 0}{gamma}{gamma} by a factor of 2. In view of the uncertainties in the measurement this is not unsatisfactory. A conservative calculation gives a lower bound for the width of {eta}{r arrow}{pi}{sup 0}{mu}{bar {mu}} of 0.9 {mu}eV.

• OSTI ID: 7199766
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 46:11; ISSN PRVDA; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

662350* -- Decays of Mesons-- (1992-)
662390 -- Electromagnetic Processes & Properties-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANTIMATTER
ANTIPARTICLES
BOSONS
DECAY
ELEMENTARY PARTICLES
ENERGY SPECTRA
ETA MESONS
FERMIONS
FORM FACTORS
GAUGE INVARIANCE
HADRONS
INVARIANCE PRINCIPLES
LEPTONS
MASSLESS PARTICLES
MATHEMATICAL MODELS
MATRIX ELEMENTS
MATTER
MESONS
MUONS
PARTICLE DECAY
PARTICLE MODELS
PARTICLE PRODUCTION
PARTICLE PROPERTIES
PHOTONS
PIONS
PIONS NEUTRAL
PSEUDOSCALAR MESONS
RADIATIVE DECAY
SPECTRA
UNITARITY
VECTOR DOMINANCE MODEL
VECTOR MESONS