Search for long-lived particles decaying into electron or photon pairs with the D0 detector

Details Search for long-lived particles decaying into electron or photon pairs with the D0 detector Search for long-lived particles decaying into electron or photon pairs with the D0 detector

2008-06-13

arxiv.org/abs/0806.2223v1

Phys.Rev.Lett.101:111802,2008

Physics

High Energy Physics

High Energy Physics - Experiment

submitted to PRL

Scientific paper

10.1103/PhysRevLett.101.111802

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, like 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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