2018 Impact factor 4.843
Particles and Fields
Eur. Phys. J. C 5, 411-437
DOI 10.1007/s100529800969

Photon and light meson production in hadronic Z0 decays

The OPAL Collaboration
K.Ackerstaff8 - et al.

8 CERN, European Organisation for Particle Physics, CH-1211 Geneva 23, Switzerland

Received: 9 April 1998 / Published online: 12 August 1998

Abstract
The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the ${\pi^0}$, $\eta$, $\rho(770)^{\pm}$, $\omega(782)$, $\eta'(958)$ and a$_0(980)^{\pm}$. The particle multiplicities per hadronic ${\mathrm{Z}^0}$ decay, extrapolated to the full energy range, are:

\begin{eqnarray}
\langle n_{\gamma} \rangle & = &
\mbox{20.97 $\pm$\space 0.02 $...
 ... = &
\mbox{0.27 $\pm$\space 0.04 $\pm$\space 0.10 }
 , \nonumber
 \end{eqnarray}
where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models.


Copyright Springer-Verlag