Artículos de revistas
Search for excited electrons in pp̄ collisions at s=1.96TeV
Fecha
2008-05-12Registro en:
Physical Review D - Particles, Fields, Gravitation and Cosmology, v. 77, n. 9, 2008.
1550-2368
1550-7998
10.1103/PhysRevD.77.091102
2-s2.0-43449092880
Autor
Universidad de Buenos Aires
Centro Brasileiro de Pesquisas Físicas
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
Institut National Polytechnique de Grenoble
Université de la Méditerranée
IN2P3/CNRS
Universités Paris VI and VII
CEA
RWTH Aachen
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Delhi University
Tata Institute of Fundamental Research
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Korea University
SungKyunKwan University
CINVESTAV
University of Amsterdam/NIKHEF
Radboud University Nijmegen/NIKHEF
Joint Institute for Nuclear Research
Institute for Theoretical and Experimental Physics
Moscow State University
Institute for High Energy Physics
Petersburg Nuclear Physics Institute
Lund University
Universität Zürich
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Imperial College
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Fermi National Accelerator Laboratory
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Helsinki Institute of Physics
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Stockholm University
Uppsala University
Institución
Resumen
We present the results of a search for the production of an excited state of the electron, e*, in proton-antiproton collisions at s=1.96TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1fb-1. We search for e* in the process pp̄→e*e, with the e* subsequently decaying to an electron plus photon. No excess above the standard model background is observed. Interpreting our data in the context of a model that describes e* production by four-fermion contact interactions and e* decay via electroweak processes, we set 95% C.L. upper limits on the production cross section ranging from 8.9 to 27 fb, depending on the mass of the excited electron. Choosing the scale for contact interactions to be Λ=1TeV, excited electron masses below 756 GeV are excluded at the 95% C.L. © 2008 The American Physical Society.