Production of $\eta$ Mesons in $e^+ e^-$ Annihilations at $\sqrt{s}=29$-{GeV}

The HRS collaboration Abachi, S. ; Akerlof, C. ; Baringer, P. ; et al.
Phys.Lett.B 205 (1988) 111-114, 1988.
Inspire Record 250824 DOI 10.17182/hepdata.29979

Data from e + e − annihilations at 29 GeV have been used to measure the production cross section and fragmentation function of η mesons. The signal is observed in the η → γγ decay channel. The fragmentation for p η >1.5 GeV/ c agrees well with the prediction of the Lund model, whereas the prediction of the Webber model lies above the data. The mean multiplicity is measured to be 〈 n η 〉=0.58±0.10 η mesons per hadronic event, of which 0.51 represents the direct production of η and η ′ mesons in the fragmentation chain.

2 data tables

Statistical errors only.

Extrapolated to full z range using LUND model.