Search for Excited or Exotic Electron Production Using the Dielectron + Photon Signature at CDF in Run II
- Duke Univ., Durham, NC (United States)
The author presents a search for excited or exotic electrons decaying to an electron and a photon with high transverse momentum. An oppositely charged electron is produced in association with the excited electron, yielding a final state dielectron + photon signature. The discovery of excited electrons would be a first indication of lepton compositeness. They use ~ 202 pb-1 of data collected in p$$\bar{p}$$ collisions at √s = 1.96 TeV with the Collider Detector at Fermilab during March 2001 through September 2003. The data are consistent with standard model expectations. Upper limits are set on the experimental cross-section σ($$\bar{p}$$p → ee* → eeγ) at the 95% confidence level in a contact-interaction model and a gauge-mediated interaction model. Limits are also presented as exclusion regions in the parameter space of the excited electron mass (Me*) and the compositeness energy scale (Λ). In the contact-interaction model, for which there are no previously published limits, they find Me* < 906 GeV is excluded for Me* = Λ. In the gauge-mediated model, the exclusion region in the Me* versus the phenomenological coupling f/Λ parameter space is extended to M{sub e*} < 430 GeV for f/Λ ~ 10-2 GeV-1. In comparison, other experiments have excluded Me* < 280 GeV for f/Λ ~ 10-2 GeV-1.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 948157
- Report Number(s):
- FERMILAB-THESIS-2004-80; TRN: US0901569
- Country of Publication:
- United States
- Language:
- English
Similar Records
Exotic physics: search for excited and exotic electrons in the e gamma decay channel in p anti-p collisions at s**(1/2) = 1.96 tev
Search for excited and exotic muons in the mu gamma decay channel in p anti-p collisions at s**(1/2) = 1.96-TeV