Abstract
Data from the recent measurements of very forward baryon and photon production with the H1 and ZEUS detectors at electron-proton collider HERA are presented and compared to the theoretical calculations and Monte Carlo models.Results are presented of the production of leading protons, neutrons and photons in deep inelastic scattering ( e p → e ' p X , e p → e ' n X , e p → e ' γ X ) as well as the leading neutron production in the photoproduction of dijets ( e p → e j j X n ). The forward baryon and photon results from the H1 and ZEUS Experiments are compared also with the models of the hadronic interactions of high energy Cosmic Rays. The sensitivity of the HERA data to the differences between the models is demonstrated.
Highlights
The QCD hardness scale for secondary particles production in semi-inclusive deep inelastic scattering (DIS) gradually decreases from the photon virtuality, Q2, which determines the hard scale in the virtual photon fragmentation region, to a soft hadronic scale in the proton fragmentation region
The photoproduction measurement is compared with the PYTHIA Monte Carlo (MC) [12], which includes the simulation of soft colour interactions (SCI) [13], in which the production of diffraction-like configurations is enhanced via non-perturbative colour rearrangements between the outgoing partons
The production of the forward protons, neutrons and photons has been studied in DIS, and the production of leading neutrons in the photoproduction of dijets
Summary
The QCD hardness scale for secondary particles production in semi-inclusive deep inelastic scattering (DIS) gradually decreases from the photon virtuality, Q2, which determines the hard scale in the virtual photon fragmentation (current) region, to a soft hadronic scale in the proton fragmentation region. Particle production at very small angles with respect to the proton beam direction (forward direction) in a process with a hard scale provides a testing ground for the theory of strong interactions in the soft regime and is important for the theoretical understanding of proton fragmentation. Measurements of forward particles provide important constraints for the modelling of the high energy air showers and thereby are very valuable for the understanding of high energy Cosmic Ray data [1]. In this presentation, the recent results of the H1 and ZEUS Collaborations of the forward proton, neutron and photon production in electron-proton and positron-proton interactions at HERA collider are reported
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