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- W1899732858 abstract "Abstract The formation of the η′ in the reaction e+e−→e+e−η′→e+e−π+π−γ has been measured by the L3 detector at a centre-of-mass energy of 91 GeV . The radiative width of the η′ has been found to be Γ γγ =4.17±0.10 (stat.) ±0.27 (sys.) keV . The Q2 dependence of the η′ formation cross section has been measured for Q 2 ≤10 GeV 2 and the η′ electromagnetic transition form factor has been determined. The form factor can be parametrised by a pole form with Λ=0.900±0.046 (stat.) ±0.022 (sys.) GeV . It is also consistent with recent non-perturbative QCD calculations." @default.
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