Search for Excited or Exotic Electron Production Using the Dielectron + Photon Signature at CDF in Run II

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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 {approx} 202 pb{sup -1} of data collected in p{bar p} collisions at {radical}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 ... continued below

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285 pages

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Gerberich, Heather Kay & U., /Duke July 1, 2004.

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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 {approx} 202 pb{sup -1} of data collected in p{bar p} collisions at {radical}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 {sigma}({bar p}p {yields} ee* {yields} ee{gamma}) 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 (M{sub e*}) and the compositeness energy scale ({Lambda}). In the contact-interaction model, for which there are no previously published limits, they find M{sub e*} < 906 GeV is excluded for M{sub e*} = {Lambda}. In the gauge-mediated model, the exclusion region in the M{sub e*} versus the phenomenological coupling f/{Lambda} parameter space is extended to M{sub e*} < 430 GeV for f/{Lambda} {approx} 10{sup -2} GeV{sup -1}. In comparison, other experiments have excluded M{sub e*} < 280 GeV for f/{Lambda} {approx} 10{sup -2} GeV{sup -1}.

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285 pages

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  • Report No.: FERMILAB-THESIS-2004-80
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/948157 | External Link
  • Office of Scientific & Technical Information Report Number: 948157
  • Archival Resource Key: ark:/67531/metadc898367

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  • July 1, 2004

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  • Sept. 27, 2016, 1:39 a.m.

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  • Dec. 8, 2016, 10:05 p.m.

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Gerberich, Heather Kay & U., /Duke. Search for Excited or Exotic Electron Production Using the Dielectron + Photon Signature at CDF in Run II, thesis or dissertation, July 1, 2004; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc898367/: accessed September 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.