Comparison of Deep Inelastic Scattering with Photoproduction Interactions at HERA

Abstract

Photon-proton ($\gamma p$) interactions with~$Q^2<10^{-2}$~GeV${}^2$ and deep-inelastic scattering (${\gamma }^{\ast }p$) interactions with photon virtualities $Q^2>5$~GeV${}^2$ are studied at the high energy electron-proton collider HERA. The transverse energy flow and relative rates of large rapidity gap events are compared in the two event samples. The observed similarity between $\gamma p$ and ${\gamma }^{\ast }p$ interactions can be understood in a picture where the photon develops as a hadronic object. The transverse energy density measured in the central region of the collision, at ${\eta }^{\ast }=0$ in the ${\gamma }^{\ast }p$ centre of mass frame, is compared with data from hadron-hadron interactions as function of the CMS energy of the collision.

15 pages, latex, 4 figures appended as uuencoded file

References in corpus (4)

• First Measurement of the Deep--Inelastic Structure of Proton Diffraction
• A Measurement of the Proton Structure Function $F_2(x,Q^2)$
• Transverse Energy and Forward Jet Production in the Low $x$ Regime at HERA
• Inclusive Parton Cross Sections in Photoproduction and Photon Structure

Cited by in corpus (8)

• Measurement of Charged Particle Transverse Momentum Spectra in Deep Inelastic Scattering
• Diffractive Exclusive Photon Production in DIS at HERA
• Charged Particle Multiplicities in Deep Inelastic Scattering at HERA
• Experimental Aspects of Jet Physics at a Future EIC
• Strangeness Production in Deep-Inelastic Positron-Proton Scattering at HERA
• Quark Flavor Tagging in Polarized Hadronic Processes
• Scale Influence on the Energy Dependence of Photon-Proton Cross Sections
• A hybrid model for multi-particle production and multi-fragment emission in electron-nucleus collisions at the forthcoming Electron-Ion Collider