Research Papers in Physics and Astronomy


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Published by American Physical Society. Phys. Rev. Lett. 94, 101802 (2005). Copyright © 2005 American Physical Society. Permission to use.


We present a search for excited and exotic electrons (e*) decaying to an electron and a photon, both with high transverse momentum. We use 202 pb-1 of data collected in pp̅ collisions at √s =1.96 TeV with the Collider Detector at Fermilab II detector. No signal above standard model expectation is seen for associated ee* production. We discuss the e* sensitivity in the parameter space of the excited electron mass Me* and the compositeness energy scale Λ. In the contact interaction model, we exclude 132 GeV/c2e*/c2 for Λ =Me* at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c-1e*/c2 at 95% C.L. for the phenomenological coupling f/ Λ ≈10-2 GeV-1.

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