Abstract

Recent measurements of hadronic final states by H1 and ZEUS at HERA are presented. The H1 measurements consist of measurements of charged particle spectra in deep-inelastic ep scattering and of forward photons and neutrons. The ZEUS results consist of a series of measurements of prompt photons in photoproduction.

Highlights

  • Most of the models fail over pT* range: DJANGOH is best

  • EPOS LHC: parton constitutents, modified treatment of central diffraction based on LHC measurements

  • ● Prompt photon photoproduction measured in many variables by ZEUS. ● The FGH (EPHOX) program gives the better account of the physics, but LMZ is satisfactory for most variables

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Summary

Results central

Most of the models fail over pT* range: DJANGOH is best. pT* < 1 GeV: apart from CASCADE, distributions in η* are OK. Most of the models fail over pT* range: DJANGOH is best. PT* < 1 GeV: apart from CASCADE, distributions in η* are OK. PT* > 1 GeV: DJANGOH OK, others poor especially at low Q2 and x. Can measure - photons and neutrons from decay of excited proton. - neutrons from colour singlet exchange process. Models tested ep based: (Lund string) LEPTO, RAPGAP + ARIADNE (colour dipole, CDM). EPOS LHC: parton constitutents, modified treatment of central diffraction based on LHC measurements. W = √(ys – Q2) Photons, neutrons with η >7.9 measured in forward neutron detector. Forward photons and neutrons in DIS Normalised W distributions for photons and neutrons. Photons: cosmic ray models all similar, all too high. Relative rate of photons/neutrons /DIS is independent of W

Results in xF for neutrons
Results
Conclusions:
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