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http://acervodigital.unesp.br/handle/11449/70573- Title:
- Search for long-lived particles decaying into electron or photon pairs with the D0 detector
- Abazov, V. M.
- Abbott, B.
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- Novaes, Sérgio Ferraz
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- Zivkovic, L.
- Zutshi, V.
- Zverev, E. G.
- Universidad de Buenos Aires
- Centro Brasileiro de Pesquisas Físicas (CBPF)
- Universidade do Estado do Rio de Janeiro (UERJ)
- Universidade Federal do ABC (UFABC)
- Universidade Estadual Paulista (UNESP)
- University of Alberta
- University of Science and Technology of China
- Universidad de los Andes
- Charles University
- Czech Technical University
- Academy of Sciences of the Czech Republic
- Universidad San Francisco de Quito
- CNRS/IN2P3
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- Joint Institute for Nuclear Research
- Institute for Theoretical and Experimental Physics (ITEP)
- Moscow State University
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- Petersburg Nuclear Physics Institute
- Lund University
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- University of Arizona
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- Fermi National Accelerator Laboratory
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- Helsinki Institute of Physics
- Universität Bern
- Universität Zürich
- 0031-9007
- 1079-7114
- 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. © 2008 The American Physical Society.
- 12-Sep-2008
- Physical Review Letters, v. 101, n. 11, 2008.
- Electromagnetism
- Electro-magnetic showers
- Final states
- Fourth generation
- Photon pairs
- Production cross sections
- Supersymmetry
- Photons
- http://dx.doi.org/10.1103/PhysRevLett.101.111802
- Acesso restrito
- outro
- http://repositorio.unesp.br/handle/11449/70573
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