819 research outputs found
Recent Low x and Diffractive Collider Data
Selected recent data from collider experiments pertaining to the
understanding of QCD at low Bjorken-x are reviewed. The status of QCD and Regge
factorisation in hard diffractive interactions is discussed in terms of data
from HERA and the Tevatron. The possibility of anomalous behaviour in the
total cross section is confronted with the most recent
measurements from LEP. Data from all three colliders that are sensitive to
possible BFKL effects are presented and different interpretations are
discussed.Comment: 9 pages, introductory talk from the 1999 Durham Phenomenology
Workshop on Collider Physic
Measurement of Feynman-x Spectra of Photons and Neutrons in the Very Forward Direction in Deep-Inelastic Scattering at HERA
Measurements of normalised cross sections for the production of photons and
neutrons at very small angles with respect to the proton beam direction in
deep-inelastic scattering at HERA are presented as a function of the
Feynman variable and of the centre-of-mass energy of the virtual
photon-proton system . The data are taken with the H1 detector in the years
2006 and 2007 and correspond to an integrated luminosity of . The measurement is restricted to photons and neutrons in the
pseudorapidity range and covers the range of negative four momentum
transfer squared at the positron vertex GeV, of inelasticity
and of GeV. To test the Feynman scaling hypothesis the
dependence of the dependent cross sections is investigated.
Predictions of deep-inelastic scattering models and of models for hadronic
interactions of high energy cosmic rays are compared to the measured cross
sections.Comment: 30 pages, 5 tables, 10 figures, submitted to EPJ
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