Search for top-quark decays to realWbosons at the Fermilab Tevatron collider
- 1 June 1989
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review D
- Vol. 39 (11), 3310-3321
- https://doi.org/10.1103/physrevd.39.3310
Abstract
We propose ways in which eventual signals from heavy-top-quark decays into on-shell or nearly-on-shell W bosons may be discriminated more sharply from background at the Fermilab Tevatron p¯p collider. For single-lepton t¯t signals, the principal background from direct W production cannot be eliminated by acceptance cuts alone, but the signal/background ratio can be greatly increased by requiring a high jet multiplicity n. Top-quark signals can be detected and can be measured via enhancements in the single-lepton event rates at high n, or via a peak in the invariant mass of the three hardest jets at high n. A t¯t signal can be extracted up to =150 GeV (180 GeV) from selected data with n≥3 (n≥4) jets. For two-lepton t¯t signals, the principal standard-model backgrounds from b¯b,c¯c and Drell-Yan dilepton production can all be removed by cuts. The remaining backgrounds from direct and Drell-Yan τ¯τ production can be suppressed to a level well below the t¯t signals, for the whole of the mass range up to =200 GeV allowed for the standard model. Eventual t¯t signals can be confirmed by characteristic dynamical distributions. An integrated luminosity of 10 (100 ) would be enough to detect top quarks up to =120 GeV (200 GeV).
Keywords
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