Search for low-mass states in elastic e+e-scattering

Xiao Yan Wu, P. Asoka-Kumar, J. S. Greenberg, S. D. Henderson, Heikki Huomo, K. G. Lynn, M. S. Lubell, R. Mayer, J. McDonough, B.F. Phlips, A. Vehanen

Research output: Contribution to journalArticleScientificpeer-review


We report results of an experiment to search for a resonance enhancement of the
e+e scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/c2<M0X<1860 keV/c2 that can be associated with the e+e sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the e+e channel dominates, we deduce lower limits on lifetimes τ>3.3×10−13 sec (J=0) and τ>8.2×10−13 sec (J=1), at 90% C.L.

Original languageEnglish
Pages (from-to)1729-1732
JournalPhysical Review Letters
Issue number12
Publication statusPublished - 1992
MoE publication typeA1 Journal article-refereed


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