Abstract
We have measured charged particle pair production in two-photon scattering at thee + e − storage ring PETRA. While the main source of such events is the production of lepton pairs, the presence of an additional process is clearly indicated by the measured invariant mass distribution of the two particles and their angular distributions. We determine that the excess is mainly due to the decayf 0(1270)→π+π-. We derive a width Γ(f 0→γγ)=3.2±0.2±0.6 keV (statistical and systematic).
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Supported by the Deutsches Bundesministerium für Forschung und Technologie
Supported by the UK Science Research Council
Supported by the Minerva Gesellschaft für die Forschung mbH, München
Supported in part by the US Department of Energy contract WY-76-C-02-0881
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TASSO Collaboration., Brandelik, R., Braunschweig, W. et al. Two-photon excitation of the tensor mesonf 0(1270). Z. Phys. C - Particles and Fields 10, 117–122 (1981). https://doi.org/10.1007/BF01547482
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DOI: https://doi.org/10.1007/BF01547482