The annihilation fractions of the p-pbar annihilation at rest into pi-pi, pi-eta, eta-eta, phi-pi0, K-Kbar and eta(1440)-pi-pi at different target densities are reviewed in order to determine their branching ratios from S and P antiprotonic atom sublevels and the sublevel population fractions. Particular emphasis is given to the incompatibility of some annihilation fraction measurements and to the expected dependence of the p-pbar atom sublevel population fractions on the target density. The population fraction of the 3P0 sublevel in liquid target turns out to be higher than its statistical weight.
Branching ratios of antiproton-proton annihilation reactions
BENDISCIOLI, GIORGIO;FONTANA, ANDREA;MONTAGNA, PAOLO MARIA
2001-01-01
Abstract
The annihilation fractions of the p-pbar annihilation at rest into pi-pi, pi-eta, eta-eta, phi-pi0, K-Kbar and eta(1440)-pi-pi at different target densities are reviewed in order to determine their branching ratios from S and P antiprotonic atom sublevels and the sublevel population fractions. Particular emphasis is given to the incompatibility of some annihilation fraction measurements and to the expected dependence of the p-pbar atom sublevel population fractions on the target density. The population fraction of the 3P0 sublevel in liquid target turns out to be higher than its statistical weight.File in questo prodotto:
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