Charged particles and neutral kaons in photoproduced jets at HERA
Collaboration
36 pages
Published in:
- Eur.Phys.J.C 2 (1998) 77-93
e-Print:
- hep-ex/9711018 [hep-ex]
Report number:
- DESY-97-229
Experiments:
View in:
Citations per year
Abstract:
Charged particles () and \kz mesons have been studied in photoproduced events containing at least one jet of 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 \hpm 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 \kz behaviour is possible with PYTHIA using a reduced value of the strangeness suppression parameter. The numbers of and \kz within a jet as defined above are measured to be and respectively. Fragmentation functions are presented for and \kz in photoproduced jets; agreement is found with calculations of Binnewies et al. and, at higher momenta, with 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 annihilation and deep inelastic scattering.Note:
- 33 pages including 19 figures Report-no: DESY-97-229
- positron p: colliding beams
- exchange: one-photon
- jet: photoproduction
- K0: associated production
- charged particle: associated production
- fragmentation function
- K0(S): hadronic decay
- mass spectrum: (pi+ pi-)
- transverse momentum: spectrum
- rapidity spectrum
References(49)
Figures(20)