Jet cross sections at HERA - current issues
نویسندگان
چکیده
منابع مشابه
Jet Cross Sections at HERA - Current Issues
Since the start of HERA operation there has been considerable progress in the understanding of jet production in ep collisions. QCD calculations are now able to accommodate the hadronic structure of the virtual photon. The luminosities delivered by HERA are now sufficient to allow studies of final states in which more than two high transverse energy jets are produced. The transition between jet...
متن کاملJet Cross-Sections and αS in DIS at HERA
Measurements of inclusive-jet and dijet cross-sections in high-Q deep-inelastic scattering are presented together with a short overview of extractions of the strong coupling parameter αS from jets. The data samples used were collected with the ZEUS detector at HERA-1 and HERA-2. The measured distributions are compared to QCD calculations in next-to-leading order which describe the data very wel...
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We calculate three jet cross sections in photoproduction using exact matrix elements for the direct and resolved contributions. Numerical distributions are presented in a generic, irreducible set of variables that allows to disentangle the dynamics of partonic QCD subprocesses from each other and from pure phase space distributions. The results are compared to preliminary data from the ZEUS col...
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The energy dependence of a given process teaches us about the dynamics of this process. If the energy dependence can be described by a Reggetype approach a la Donnachie and Landshoff [1] we call the process soft. The total hadron-proton cross sections dependence on center-of-mass energy exemplifies the behaviour of soft processes.. If the energy dependence can be described by perturbative QCD (...
متن کاملVector meson cross sections at HERA
Fig. 1. Schematic picture of inelastic (a) and elastic (b) vector meson leptoproduction Vector mesons can be produced in two different ways in lepton proton scattering, in so-called inelastic processes, where the proton breaks, or elastic (exclusive) processes, where the incoming proton stays intact. The different production mechanisms are shown schematically in Fig. 1. They suggest that the cr...
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ژورنال
عنوان ژورنال: Journal of Physics G: Nuclear and Particle Physics
سال: 1999
ISSN: 0954-3899,1361-6471
DOI: 10.1088/0954-3899/25/7/329