High Q{sup 2} events in ep collisions

Journal Article · Sun Apr 20 00:00:00 EDT 1997 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.53707· OSTI ID:21167544

Zarnecki, A F ^[1]

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1. DESY-F1, Notkestrasse 85, 22607 Hamburg (Germany)

Using the ZEUS detector at HERA, we have studied the reaction e{sup +}p{yields}e{sup +}X for Q{sup 2}>5000 GeV{sup 2} with a 20.1 pb{sup -1} data sample collected during the years 1994 to 1996. For Q{sup 2} below 15000 GeV{sup 2}, the data are in good agreement with Standard Model expectations. For Q{sup 2}>35000 GeV{sup 2}, two events are observed while 0.145{+-}0.013 events are expected. For x>0.55 and y>0.25, four events are observed where 0.91{+-}0.08 events are expected. The observed excess above Standard Model expectations is particularly interesting because it occurs in a previously unexplored kinematic region.

• OSTI ID: 21167544
• Journal Information: AIP Conference Proceedings, Vol. 407, Issue 1; Conference: 5. international workshop on deep inelastic scattering and QCD, Chicago, IL (United States), 14-18 Apr 1997; Other Information: DOI: 10.1063/1.53707; (c) 1997 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COLLIDING BEAMS
FOUR MOMENTUM TRANSFER
HERA STORAGE RING
LEPTON-PROTON INTERACTIONS
MULTIPARTICLE SPECTROMETERS
PARTICLE IDENTIFICATION
PARTICLE KINEMATICS
POSITRON BEAMS
POSITRON REACTIONS
POSITRONS
PROTON BEAMS
STANDARD MODEL