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

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

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...

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Veröffentlicht in:Phys. Rev. Lett.; (United States) 1986-09, Vol.57 (12), p.1402-1405
Hauptverfasser: Piilonen, LE, Bolton, RD, Cooper, MD, Frank, JS, Hallin, AL, Heusi, P, Hogan, GE, Hoffman, CM, Mariam, FG, Mischke, RE, Sandberg, VD, Williams, RA, Wilson, SL, Highland, VL, McDonough, J, Grosnick, D, Wright, SC, Ritter, M
Format: Artikel
Sprache:eng
Schlagworte:
645102 > High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
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
PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
PIONS
PIONS PLUS
POSITRONS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
RADIATIVE DECAY
SCATTERPLOTS
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS 645101 > High Energy Physics-- Particle Interactions & Properties-Experimental-- Electromagnetic Interactions & Properties
VECTOR CURRENTS
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Zusammenfassung: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
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.57.1402