منابع مشابه
Cross sections at HERA
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 کاملDifermion Cross-sections at Lepii
Precision measurements at LEPII provide a unique test of Standard Model predictions. Results from the four LEP collaborations ALEPH, DELPHI, L3 and OPAL on the difermion cross-sections and asymmetries obtained at centre-of-mass energies between 192 and 202 GeV are presented. The high s ′ results are used to determine the running of the electromagnetic coupling constant and the strength of the i...
متن کاملFusion cross sections at deep subbarrier energies
A recent publication reports that heavy-ion fusion cross sections at extreme subbarrier energies show a continuous change of their logarithmic slope with decreasing energy, resulting in a much steeper excitation function compared with theoretical predictions. We show that the energy dependence of this slope is partly due to the asymmetric shape of the Coulomb barrier, that is its deviation from...
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...
متن کاملDIBOSON PRODUCTION CROSS-SECTIONS AT √s = 1.96TeV
Recent results of Wγ , Zγ and WW cross-section measurements in the electron and muon channels are reported from p¯ p collisions at √ s = 1.96 TeV recorded by the CDF and D0 collaborations. Total cross-sections and kinematic distributions are found to be consistent with Standard Model expectations.
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1952
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800068059