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A search for unstable heavy neutral leptons in e+e−e^+e^- annihilations at s\sqrt{s} from 50 GeV to 60.8 GeV

Collaboration
•
Jul, 1989
11 pages
Published in:
  • Phys.Rev.Lett. 63 (1989) 1342
DOI:
Report number:
  • KEK-Preprint-89-41,
  • AMY-89-05
Experiments:
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reference search13 citations

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198919901991199219936501
Abstract: (APS)
A search for unstable heavy neutral leptons has been made at center-of-mass energies from 50 to 60.8 GeV with the AMY detector at the KEK Storage ring TRISTAN. The neutral leptons are assumed to decay via mixing to electrons and muons. Events with two leptons were searched for. No evidence for their existence was found. Limits in the mass range &≤28.1 GeV/c2 and mixing-parameter range 9×10−10≤‖UlL‖2≤1 are presented for Dirac- and Majorana-type neutrinos.
  • ELECTRON POSITRON: COLLIDING BEAMS
  • COLLIDING BEAMS: ELECTRON POSITRON
  • ELECTRON POSITRON: ANNIHILATION
  • ANNIHILATION: ELECTRON POSITRON
  • NEUTRINO/L: SEARCH FOR
  • NEUTRINO/L: PAIR PRODUCTION
  • PAIR PRODUCTION: NEUTRINO/L
  • NEUTRINO/L: LEPTONIC DECAY
  • LEPTONIC DECAY: NEUTRINO/L
  • NEUTRINO/L: SEMILEPTONIC DECAY