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- W2056574139 abstract "We report results of an experiment to search for a resonance enhancement of the ${mathit{e}}^{+}$${mathit{e}}^{mathrm{ensuremath{-}}}$ scattering cross section in a metallic Li target utilizing an energy-tunable monoenergetic positron beam. Within statistical uncertainties (0.27%) no evidence has been observed for deviations from Bhabha scattering over the entire invariant-mass region 1560 keV/${mathit{c}}^{2}$${mathit{M}}_{mathit{X}}^{0}$1860 keV/${mathit{c}}^{2}$ that can be associated with the ${mathit{e}}^{+}$${mathit{e}}^{mathrm{ensuremath{-}}}$ sum-peak energies in GSI heavy-ion experiments. Under the assumptions that the ${mathit{e}}^{+}$${mathit{e}}^{mathrm{ensuremath{-}}}$ channel dominates, we deduce lower limits on lifetimes ensuremath{tau}>3.3ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}13}$ sec (J=0) and ensuremath{tau}>8.2ifmmodetimeselsetexttimesfi{}${10}^{mathrm{ensuremath{-}}13}$ sec (J=1), at 90% C.L." @default.
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- W2056574139 date "1992-09-21" @default.
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- W2056574139 title "Search for low-mass states in elastice+e−scattering" @default.
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- W2056574139 doi "https://doi.org/10.1103/physrevlett.69.1729" @default.
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