1996/05/08 by Gregorio Bernardi, Bernardi, Gregorio
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #hep-ex
paper · pdf · doi:10.48550/arxiv.hep-ex/9605003
12 pages with 7 ps figures embedded (Talk given at the Baryon 95 conference, Santa Fe', oct.95)
arxiv created 1996/05/08 · arxiv updated 2009/11/30
New results from the H1 and ZEUS collaborations on the measurement of cross-sections at very high Q2 (up to 25000 GeV2) and on the proton structure function F2(x,Q2) for momentum transfers squared Q2 >= 1.5 GeV2 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 Q2 and F2 is seen to increase significantly with decreasing x, even in the lowest reachable Q2 region. Comparisons at low Q2 with fixed target experiments and with models based on pomeron exchange are presented. The F2 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 Q2 range generated via the DGLAP evolution equations. The gluon density is extracted and being observed to rise at low x.