WHERE IS TOP?

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Abstract
Possibilities are discussed for determining the top-quark mass mt from observations on the decay processes for top-antitop pairs produced in antiproton-proton collisions at Tevatron energies, assuming that the t→bW+ decay channel is dominant and much faster than hadronization. The final states provide the most striking signal, with little background, but they are rare (≈2/81). If all three candidate events prove to be from , an estimate follows for P(mt|rate), the probability distribution for mt. The one reported configuration allows an independent estimate for P (mt|μ± e∓ 2 jets). These two distributions are compatible and can be combined to give an mt estimate of about 122 GeV. Decay events “1 energetic lepton(ℓ)+4 jets” should appear 12 times as often as “ μ± e∓ 2 jets” events and can be analyzed to give estimates for P(mt|ℓ 4 jets); this is illustrated for a fictitious event. There may be background from nontop events but suitable cuts on the data and our analysis procedure together reduce this to a low level. The rate observed for these events does not appear to be as large as the factor 12. Identification of either or both of the jets would be a great step forward, separating out the “ ” and “ ” events of importance with little background. We advocate an energetic approach to the analysis of individual events [whether 2, 1 or no (b or ) jets identified] on an event-by-event basis, with the hope of finding a subgroup of events with a common mass estimate.
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