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Study of the decay [ital K][sub [ital L]][r arrow][pi][sup [plus minus]][pi][sup 0][ital e[minus plus]][bar [nu]]([nu])

Journal Article · · Physical Review Letters; (United States)
; ; ; ; ; ; ; ; ; ; ;  [1];  [2]; ; ; ; ; ; ; more »;  [3]; ; ;  [4]; ; ; ;  [5] « less
  1. Enrico Fermi Institute and the Department of Physics, The University of Chicago, Chicago, Illinois 60637 (United States)
  2. Department of Physics, Elmhurst College, Elmhurst, Illinois 60126 (United States) The Enrico Fermi Institute, The University of Chicago, Chicago, Illinois 60637 (United States)
  3. Fermi National Accelerator Laboratory, Bativia, Illinois 60510 (United States)
  4. Department of Physics, Princeton University, Princeton, New Jersey 08544 (United States)
  5. Departement de Physique des Particules Elementaires, Centre d'Etudes Nucleaires de Saclay, F-91191 Gif-sur-Yvette CEDEX (France)
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We have observed 729[plus minus]15 [ital K][sub [ital L]][r arrow][pi][sup [plus minus]][pi][sup 0][ital e[minus plus]][bar [nu]]([nu]) decays in the data set collected in the 1987--1988 run of Fermilab experiment E731. We found the [ital K][sub [ital e]4] branching ratio to be [5.16[plus minus]0.20(stat)[plus minus]0.22(sys)][times]10[sup [minus]5]. We also performed the first measurement of the form factors parametrizing the decay. Our branching ratio result agrees with a prediction using a vector-meson-exchange model. An interpretation of the data in terms of chiral perturbation theory implies a value [ital L][sub 3]=(3.4[plus minus]0.4)[times]10[sup [minus]3] in the O([ital p][sup 4]) chiral Lagrangian.

OSTI ID:
6654918
Journal Information:
Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 70:11; ISSN 0031-9007; ISSN PRLTAO
Country of Publication:
United States
Language:
English

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Related Subjects

662350* -- Decays of Mesons-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
BOSONS
BRANCHING RATIO
CALCULATION METHODS
CURRENTS
DATA
DECAY
ELECTRONS
ELEMENTARY PARTICLES
EXPERIMENTAL DATA
FERMIONS
FORM FACTORS
HADRONS
INFORMATION
KAONS
KAONS NEUTRAL
KAONS NEUTRAL LONG-LIVED
LEPTONS
MASSLESS PARTICLES
MESONS
MONTE CARLO METHOD
NEUTRINOS
NUMERICAL DATA
PARAMETRIC ANALYSIS
PARTICLE DECAY
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
PARTICLE PROPERTIES
PIONS
PSEUDOSCALAR MESONS
SEMILEPTONIC DECAY
STRANGE MESONS
STRANGE PARTICLES
VECTOR CURRENTS
WEAK PARTICLE DECAY