Search for top-quark decays to real /ital W/ bosons at the Fermilab Tevatron collider
We propose ways in which eventual signals from heavy-top-quark decays into on-shell or nearly-on-shell /ital W/ bosons may be discriminated more sharply from background at the Fermilab Tevatron /ital p/bar /p/ collider. For single-lepton /ital t/bar /t/ signals, the principal background from direct /ital W/ production cannot be eliminated by acceptance cuts alone, but the signal/background ratio can be greatly increased by requiring a high jet multiplicity /ital n/. Top-quark signals can be detected and /ital m//sub /ital t// can be measured via enhancements in the single-lepton event rates at high /ital n/, or via a peak in the invariant mass of the three hardest jets at high /ital n/. A /ital t/bar /t/ signal can be extracted up to /ital m//sub /ital t//=150 GeV (180 GeV) from selected data with /ital n/greater than or equal to3 (/ital n/greater than or equal to4) jets. For two-lepton /ital t/bar /t/ signals, the principal standard-model backgrounds from /ital b/bar /b/,/ital c/bar /c/ and Drell-Yan dilepton production can all be removed by cuts. The remaining backgrounds from direct /ital W//sup +/W/sup /minus// and Drell-Yan /tau/bar ///tau/ production can be suppressed to a level well below the /ital t/bar /t/ signals, for the whole of the mass range up to /ital m//sub /ital t//=200 GeV allowed for the standard model. Eventual /ital t/bar /t/ signals can be confirmed by characteristic dynamical distributions. An integrated luminosity of 10 pb/sup /minus/1/ (100 pb/sup /minus/1/) would be enough to detect top quarks up to /ital m//sub /ital t//=120 GeV (200 GeV).
- Research Organization:
- Physics Department, Florida State University, Tallahassee, Florida 32306(US); Physics Department, University of Wisconsin, Madison, Wisconsin 53706; Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, England
- OSTI ID:
- 6140504
- Journal Information:
- Phys. Rev. D; (United States), Vol. 39:11
- Country of Publication:
- United States
- Language:
- English
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645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties
645203 - High Energy Physics- Particle Interactions & Properties-Theoretical- Weak Interactions & Properties