The TPC/Two-Gamma facility at the SLAC e+e- storage ring PEP was used to study the reactions γγ* → η and γγ* → η′. The ηγ*γ and η′γ*γ transition form factors were measured as functions of Q2, the negative of the invariant mass squared of the tagged photon, in the range 0.1 < Q2 < 7 GeV2. These determinations of the electromagnetic structure of the η and η′ mesons are consistent with both vector-meson dominance and QCD. They also provide new measurements of the pseudoscalar mixing angle and decay constants.
|Number of pages||4|
|Journal||Physical Review Letters|
|Publication status||Published - 1990 Jan 8|
ASJC Scopus subject areas
- Physics and Astronomy(all)