Search for Long-Lived Particles Decaying into Electron or Photon Pairs with the D0 Detector

V. M. Abazov et al. (D0 Collaboration)
Phys. Rev. Lett. 101, 111802 – Published 12 September 2008

Abstract

In this Letter we report on a search for long-lived particles that decay into final states with two electrons or photons. Such long-lived particles arise in a variety of theoretical models, such as hidden valleys and supersymmetry with gauge-mediated breaking. By precisely reconstructing the direction of the electromagnetic shower we are able to probe much longer lifetimes than previously explored. We see no evidence of the existence of such long-lived particles and interpret this search as a quasi model-independent limit on their production cross section, as well as a limit on a long-lived fourth generation quark.

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  • Received 16 June 2008

DOI:https://doi.org/10.1103/PhysRevLett.101.111802

©2008 American Physical Society

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Vol. 101, Iss. 11 — 12 September 2008

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