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A search for excited fermions in electron-proton collisions at HERA

  • Experimental Physics
  • Published:
Zeitschrift für Physik C Particles and Fields

Abstract

A search for excited states of the standard model fermions was performed using the ZEUS detector at the HERA electron-proton collider, operating at a centre of mass energy of 296 GeV. In a sample corresponding to an integrated luminosity of 0.55 pb−1, no evidence was found for any resonant state decaying into final states composed of a fermion and a gauge boson. Limits on the coupling strength times branching ratio of excited fermions are presented for masses between 50 GeV and 250 GeV, extending previous search regions significantly.

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supported by Worldlab Lausanne, Switzerland

supported by the European Community

CERN

on leave of absence at DESY, supported by DGICYT

Fulbright Scholar 1993–1994

on leave and partially supported by DESY 1993–95

supported by a MINERVA Fellowship

supported by the Natural Sciences and Engineering Research Council of Canada

supported by the FCAR of Quebec, Canada

supported by the German Federal Ministry for Research and Technology (BMFT)

supported by the MINERVA Gesellschaft für Forschung GmbH, and by the Israel Academy of Science

supported by the German Israeli Foundation, and by the Israel Academy of Science

supported by the Italian National Institute for Nuclear Physics (INFN)

supported by the Japanese Ministry of Education, Science and Culture (the Monbusho) and its grants for Scientific Research

supported by the Korean Ministry of Education and Korea Science and Engineering Foundation

supported by the Netherlands Foundation for Research on Matter (FOM)

supported by the Polish State Committee for Scientific Research (grant No. 204209101)

supported by the Polish State Committee for Scientific Research (grant No. PB 861/2/91 and No. 2 2372 9102, grant No. PB 2 2376 9102 and No. PB 2 0092 9101)

partially supported by the German Federal Ministry for Research and Technology (BMFT)

supported by the German Federal Ministry for Research and Technology (BMFT), the Volkswagen Foundation, and the Deutsche Forschungsgemein schaft

supported by the Spanish Ministry of Education and Science through funds provided by CICYT

supported by the Particle Physics and Astronomy Research Council

supported by the US Department of Energy

supported by the US National Science Foundation

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ZEUS Collaboration., Derrick, M., Krakauer, D. et al. A search for excited fermions in electron-proton collisions at HERA. Z. Phys. C - Particles and Fields 65, 627–647 (1995). https://doi.org/10.1007/BF01578671

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  • DOI: https://doi.org/10.1007/BF01578671

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