ISSN:
1434-601X
Keywords:
14.80.Pb
;
13.10. + q
;
12.20.Fv
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract Motivated by the observation of energy- and momentum-correlatede + e − pairs in heavy ion collisions, a search for resonances ine + e − scattering at the corresponding energies has been made. Thee + e − decay channel is analyzed in a time window from ∼ 10−13 s to ∼ 10−11 s with a set-up optimized for low-background detection of delayede + e − decays. The two-photon decay channel of a hypothetical resonance is investigated by measuring the two-photon annihilation-in-flight excitation function. New upper limits for the partiale + e − decay width Γee of a few meV are derived for total centre-of-mass energies √s between 1.78 and 1.92 MeV, taking into account the dilepton as well as the two-photon decay of a neutral resonance.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01303834
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