Comparison of ZEUS data with standard model predictions for e+p → e+X scattering at high x and Q2

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Research output: Contribution to journalReview articlepeer-review

197 Citations (Scopus)

Abstract

Using the ZEUS detector at HERA, we have studied the reaction e+p → e+X for Q2 > 5000 GeV2 with a 20.1 pb-1 data sample collected during the years 1994 to 1996. For Q2 below 15000 GeV2, the data are in good agreement with Standard Model expectations. For Q2 > 35000 GeV2, 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 Q2 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 Q2 > 5000 GeV2 data sample. The observed excess above Standard Model expectations is particularly interesting because it occurs in a previously unexplored kinematic region.

Original languageEnglish
Pages (from-to)207-220
Number of pages14
JournalZeitschrift fur Physik C-Particles and Fields
Volume74
Issue number2
DOIs
Publication statusPublished - 1997 Apr

Bibliographical note

Funding Information:
funds provided by CICYT o supported by the Particle Physics and Astronomy Research Council p supported by the US Department of Energy q supported by the US National Science Foundation

Funding Information:
9 also at DESY and Alexander von Humboldt Fellow 10 Alfred P. Sloan Foundation Fellow 11 supported by an EC fellowship number ERBFMBICT 950172 12 visitor from Florida State University 13 now at ALCATEL Mobile Communication GmbH, Stuttgart 14 now at DESY Computer Center 15 supported by European Community Program PRAXIS XXI 16 now at DESY-Group FDET 16a visitor from Kyungpook National University, Taegu, Korea, partially supported by DESY 17 now at Fermi National Accelerator Laboratory (FNAL), Batavia, IL, USA 18 now at Siemens A.G., Munich 19 now at NORCOM Infosystems, Hamburg 20 now at ATLAS Collaboration, Univ. of Munich 21 now at Clinical Operational Research Unit, University College, London 22 on leave from MSU, supported by the GIF, contract I-0444-176.07/95 23 now a self-employed consultant 24 supported by an EC fellowship 25 PPARC Post-doctoral Fellow 26 now at Conduit Communications Ltd., London, U.K. 27 now at Department of Energy, Washington 28 now at Lawrence Berkeley Laboratory, Berkeley 29 now at Yale University, New Haven, CT 30 supported by a MINERVA Fellowship 31 partially supported by DESY 32 now at CERN 33 present address: Tokyo Metropolitan College of Allied Medical Sciences, Tokyo 116, Japan 34 supported by the Polish State Committee for Scientific Research, grant No. 2P03B09308 35 supported by the Polish State Committee for Scientific Research, grant No. 2P03B09208 a supported by the Natural Sciences and Engineering Research Council of Canada (NSERC) b supported by the FCAR of Québec, Canada c supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), under contract numbers 057BN19P, 057FR19P, 057HH19P, 057HH29P, 057SI75I d supported by the MINERVA Gesellschaft für Forschung GmbH, the German Israeli Foundation, and the U.S.-Israel Binational Science Foundation e supported by the German Israeli Foundation, and by the Israel Science Foundation f supported by the Italian National Institute for Nuclear Physics (INFN) g supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research h supported by the Korean Ministry of Education and Korea Science and Engineering Foundation i supported by the Netherlands Foundation for Research on Matter (FOM) j supported by the Polish State Committee for Scientific Research, grant No. 115/E-343/SPUB/P03/120/96 k supported by the Polish State Committee for Scientific Research (grant No. 2 P03B 083 08) and Foundation for Polish-German Collaboration l partially supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF) m supported by the German Federal Ministry for Education and Science, Research and Technology (BMBF), and the Fund of Fundamental Research of Russian Ministry of Science and Education and by INTAS-Grant No. 93-63 n supported by the Spanish Ministry of Education and Science through

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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