Year: 1996
Type: preprint
Abstract: New results from the H1 and ZEUS collaborations on the measurement of cross-sections at very high Q^2 (up to 25000 GeV^2) and on the proton structure function F_2(x,Q^2) for momentum transfers squared Q^2 >= 1.5 GeV^2 and Bjorken x >= 3.5 10^{-5} are reported, using data collected at HERA mainly in 1994. No deviations from the Standard Model have been observed at high Q^2 and F_2 is seen to increase significantly with decreasing x, even in the lowest reachable Q^2 region. Comparisons at low Q^2 with fixed target experiments and with models based on pomeron exchange are presented. The F_2 results are well described by a Next to Leading Order QCD fit, and are consistent at the present level of precision with the rise at low x within this Q^2 range generated via the DGLAP evolution equations. The gluon density is extracted and being observed to rise at low x.
Source: arXiv (Cornell University)
Author: Bernardi, Gregorio
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1871719271