Research Papers in Physics and Astronomy


Date of this Version

May 2008


Published by American Physical Society. Phys. Rev. D 77, 091102(R) (2008). Copyright © 2008 American Physical Society. Permission to use.


We present the results of a search for the production of an excited state of the electron, e*, in protonantiproton collisions at √s = 1.96 TeV. The data were collected with the D0 experiment at the Fermilab Tevatron Collider and correspond to an integrated luminosity of approximately 1 fb-1.We search for e* in the process ppe*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 = 1 TeV, excited electron masses below 756 GeV are excluded at the 95% C.L.

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