Unique determination of the form-factor ratio in radiative pion decay

Journal Article · Mon Sep 22 04:00:00 EDT 1986 · Phys. Rev. Lett.; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.57.1402· OSTI ID:5174165

Piilonen, L E; Bolton, R D; Cooper, M D; Frank, J S; Hallin, A L; Heusi, P; Hogan, G E; Hoffman, C M; Mariam, F G; Mischke, R E; others, and

A new experiment studying radiative pion decay, ..pi../sup +/..-->..e/sup +/..nu../sub e/..gamma.., has been performed with the Crystal Box detector at the Clinton P. Anderson Meson Physics Facility. From a maximum-likelihood analysis of the Dalitz-plot distribution of 2364 coincident and random events, we obtain a unique value for ..gamma.., the ratio of the axial-vector to vector weak pion form factors, of 0.25 +- 0.12. The new world average is ..gamma.. -- 0.39 +- 0.06. .AE

• Research Organization: Los Alamos National Laboratory, Los Alamos, New Mexico 87545
• OSTI ID: 5174165
• Journal Information: Phys. Rev. Lett.; (United States), Journal Name: Phys. Rev. Lett.; (United States) Vol. 57:12; ISSN PRLTA
• Country of Publication: United States
• Language: English

Related Subjects

645101* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALGEBRAIC CURRENTS
ANTILEPTONS
ANTIMATTER
ANTIPARTICLES
AXIAL-VECTOR CURRENTS
BOSONS
CURRENTS
DALITZ PLOT
DIAGRAMS
ELECTRON NEUTRINOS
ELEMENTARY PARTICLES
FERMIONS
FORM FACTORS
HADRONS
LEPTONS
MASSLESS PARTICLES
MAXIMUM-LIKELIHOOD FIT
MEASURING INSTRUMENTS
MESONS
NAI DETECTORS
NEUTRINOS
NUMERICAL SOLUTION
PARTICLE PROPERTIES
PIONS
PIONS PLUS
POSITRONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RADIATIVE DECAY
SCATTERPLOTS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
VECTOR CURRENTS