Abstract.
Charged particles (\(h^\pm\)) and \(K^0\) mesons have been studied in photoproduced events containing at least one jet of \(E_T > 8\) GeV in a pseudorapidity interval (–0.5, 0.5) in the ZEUS laboratory frame. Distributions are presented in terms of transverse momentum, pseudorapidity and distance of the particle from the axis of a jet. The properties of \(h^\pm\) within the jet are described well using the standard settings of PYTHIA, but the use of the multiparton interaction option improves the description outside the jets. A reasonable overall description of the \(K^0\) behaviour is possible with PYTHIA using a reduced value of the strangeness suppression parameter. The numbers of \(h^\pm\) and \(K^0\) within a jet as defined above are measured to be \(3.25\pm0.02\pm0.28\) and \(0.431\pm0.013\pm0.088\) respectively. Fragmentation functions are presented for \(h^\pm\) and \(K^0\) in photoproduced jets; agreement is found with calculations of Binnewies et al. and, at higher momenta, with \(p\bar p\) scattering and with standard PYTHIA. Fragmentation functions in direct photoproduced events are extracted, and at higher momenta give good agreement with data from related processes in \(e^+e^-\) annihilation and deep inelastic \(ep\) scattering.
Similar content being viewed by others
Author information
Authors and Affiliations
Consortia
Additional information
Received: 18 November 1997
Rights and permissions
About this article
Cite this article
ZEUS Collaboration., Breitweg et al., J. Charged particles and neutral kaons in photoproduced jets at HERA. Eur. Phys. J. C 2, 77–93 (1998). https://doi.org/10.1007/PL00021563
Issue Date:
DOI: https://doi.org/10.1007/PL00021563