Accession Number : AD0666979

Title :   THE FORM FACTOR OF THE NEUTRAL PION,

Corporate Author : COLUMBIA UNIV IRVINGTON-ON-HUDSON 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 'neutral-pion 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 pi-zero structure on the invariant mass spectrum of the pair is interpreted as an electromagnetic form factor for the neutral-pion. 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