New limits for resonant Bhabha scattering around the invariant mass of 1.8 MeV/c2
Date
1988Source
Zeitschrift für Physik A Atomic NucleiVolume
331Issue
1Pages
103-104Google Scholar check
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The excitation function for Bhabha scattering was reinvestigated in the energy range between 775 and 840 keV (c.m.) in 1.4 keV steps using a monoenergetic e+ -beam and a high-resolution kinematic coincidence detector device. Corroborating our previous results, no resonance was observed around 1.8 MeV/c2 up to an improved upper limit of 0.5 b·eV/sr (c.m.) for the energy-integrated differential cross section (97 % C.L.) The data rule out the existence of a resonance with a cross section of 5.0 b·eV/sr, recently reported elsewhere. © 1988 Springer-Verlag.