
Accession Number : AD0666979
Title : THE FORM FACTOR OF THE NEUTRAL PION,
Corporate Author : COLUMBIA UNIV IRVINGTONONHUDSON N Y NEVIS LABS
Personal Author(s) : Nemethy,Peter
Report Date : 1968
Pagination or Media Count : 74
Abstract : In an experiment performed at Columbia University's Nevis Cyclotron, the decay 'neutralpion to gamma photon + electron + positron' was observed. Using a system of counters and spark chambers 2200 events were recorded with an opening angle of the Dalitz pair near 120 deg. The effect of pizero structure on the invariant mass spectrum of the pair is interpreted as an electromagnetic form factor for the neutralpion. The form factor is a linear function, (gamma)(x) = 1 + ax, of the invariant mass squared, x. The experimental result for the form factor slope is a = (+0.01 plus or minus 0.11) (1/(pion mass)sq.).
Descriptors : (*PIONS, *DECAY SCHEMES), MESON REACTIONS, GAMMA EMISSION, PAIR PRODUCTION, INVARIANCE, DISPERSION RELATIONS, INTERNAL CONVERSION
Subject Categories : Nuclear Physics & Elementary Particle Physics
Distribution Statement : APPROVED FOR PUBLIC RELEASE