Search for Excited and Exotic Electrons in the eγ Decay Channel in pp Collisions at s~(1/2)= 1.96 Te V

摘要

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 pp collisions at s~(1/2) = 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 M_(e~*) and the compositeness energy scale Λ. In the contact interaction model, we exclude 132 GeV/c~2 < M_(e~*) < 879 GeV/c~2 for Λ = M_(e~*) at 95% confidence level (C.L.). In the gauge-mediated model, we exclude 126 GeV/c~2 < M_(e~*) < 430 GeV/c~2 at 95% C.L. for the phenomenological coupling f/Λ ≈ 10~(-2)