2020 Impact factor 4.590
Particles and Fields
Eur. Phys. J. C 6, 253-264
DOI 10.1007/s100529801028

Inclusive production of charged hadrons and ${\rm K}^0_{\rm S}$ mesons
in photon-photon collisions

The OPAL Collaboration
K.Ackerstaff$^{\rm 8}$ - et al.

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

Received: 4 June 1998 / Published online: 6 November 1998

The production of charged hadrons and ${\rm K}^0_{\rm S}$ mesons in the collisions of quasi-real photons has been measured using the OPAL detector at LEP. The data were taken at $\mbox{e}^+\mbox{e}^-$ centre-of-mass energies of 161 and 172 GeV. The differential cross-sections as a function of the transverse momentum and the pseudorapidity of the charged hadrons and ${\rm K}^0_{\rm S}$ mesons have been compared to the leading order Monte Carlo simulations of PHOJET and PYTHIA and to perturbative next-to-leading order (NLO) QCD calculations. The distributions have been measured in the range 10<W<125 GeV of the hadronic invariant mass W. By comparing the transverse momentum distribution of charged hadrons measured in ${\gamma\gamma}$ interactions with $\gamma$-proton and meson-proton data we find evidence for hard photon interactions in addition to the purely hadronic photon interactions.

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