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Comparison of ZEUS data with standard model predictions for e+p→e+Xe^{+} p \to e^{+} X scattering at high x and Q2Q^{2}

Collaboration
Feb, 1997
33 pages
Published in:
  • Z.Phys.C 74 (1997) 207-220
e-Print:
DOI:
Report number:
  • DESY-97-025,
  • DESY-97-25,
  • ANL-HEP-PR-98-57
Experiments:
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Abstract:
Using the ZEUS detector at HERA, we have studied the reaction e~+ p -> e~+ X for Q~2 > 5000 GeV~2 with a 20.1 pb~{-1} data sample collected during the years 1994 to 1996. For Q~2 below 15000 GeV~2, the data are in good agreement with Standard Model expectations. For Q~2 > 35000 Gev~2, two events are observed while 0.145+-0.013 events are expected. A statistical analysis of a large ensemble of simulated Standard Model experiments indicates that with probability 6.0%, an excess at least as unlikely as that observed would occur above some Q~2 cut. For x>0.55 and y>0.25, four events are observed where 0.91+-0.08 events are expected. A statistical analysis of the two-dimensional distribution of the events in x and y yields a probability of 0.72% for the region x>0.55 and y>0.25 and a probability of 7.8% for the entire Q~2 > 5000 GeV~2 data sample. The observed excess above Standard Model expectations is particularly interesting because it occurs in a previously unexplored kinematic region.
Note:
  • 33 pages, LaTeX, 7 figures, to be published in Z.f.Phys Report-no: DESY-97-025
  • positron p: colliding beams
  • positron p: deep inelastic scattering
  • momentum transfer: high
  • electroweak interaction: validity test
  • statistical analysis
  • background
  • spectrum: x-dependence
  • ZEUS
  • experimental results
  • DESY HERA Stor
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