Abstract
We present a measurement of the top quark pair production cross section in ppbar collisions at sqrt(s)=1.96 TeV using a data sample corresponding to 1.7/fb of integrated luminosity collected with the Collider Detector at Fermilab. We reconstruct ttbar events in the lepton+jets channel. The dominant background is the production of W bosons in association with multiple jets. To suppress this background, we identify electrons from the semileptonic decay of heavy-flavor jets. We measure a production cross section of 7.8 +/- 2.4 (stat) +/- 1.6 (syst) +/- 0.5 (lumi) pb. This is the first measurement of the top pair production cross section with soft electron tags in Run II of the Tevatron.
Highlights
The top quark is the most massive fundamental particle observed to date, and has been studied by the CDF and D0 collaborations since its discovery in 1995 [1]
The SLTe algorithm uses the COT and silicon trackers, central calorimeter and, in particular, the central showermaximum chambers to identify electrons embedded in jets from semileptonic decays of HF quarks
For the SLTe algorithm, we introduce the isolation variable ISLT defined as the scalar sum of the pT of tracks which point to the calorimeter cluster divided by the candidate track pT: ÆclstpT=pT
Summary
The top quark is the most massive fundamental particle observed to date, and has been studied by the CDF and D0 collaborations since its discovery in 1995 [1]. The tt" production cross section has been measured in each of the three canonical final states: qq"0bqq"0b" [2], qq"0b‘" b" [3,4,5], and ‘"b‘" b" [6] (‘ 1⁄4 e, , and q 1⁄4 u, d, c, s) In these measurements, different combinations of b-quark identification (‘‘tagging’’) and kinematic information [3] have been used to suppress backgrounds. The dominant background in this channel is the production of a W boson associated with several jets To suppress this background, we use a soft electron tagger (SLTe) to identify the semileptonic decay of heavy flavor (HF).
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