New limits for resonant Bhabha scattering around the invariant mass of 1.8 MeV/c2 |
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| Authors: | H. Tsertos C. Kozhuharov P. Armbruster P. Kienle B. Krusche K. Schreckenbach |
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| Affiliation: | 1. Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-6100, Darmstadt, Federal Republic of Germany
2. Institut Max von Laue - Paul Langevin, 156X Centre de Tri, F-38042, Grenoble Cedex, France
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| Abstract: | 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. |
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