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Measurement of the t(t)over-bar production cross section in p(p)over-bar collisions at root s=1.96 TeV using soft electron b-tagging

AuthorsCabrera, Susana ; Cuenca Almenar, Cristóbal ; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez, G. ; Rodrigo, Teresa ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Vila, Iván ; Vilar, Rocío ; Aaltonen, T.
Issue Date1-May-2010
PublisherAmerican Physical Society
CitationPhysical Review - Section D - Particles and Fields 81 (9): 092002 (2010)
AbstractWe present a measurement of the top-quark pair-production cross section in p (p) over bar collisions at root s = 1.96 TeV using a data sample corresponding to 1.7 fb(-1) of integrated luminosity collected with the Collider Detector at Fermilab. We reconstruct t (t) over bar events in the lepton + jets channel, consisting of e nu + jets and mu nu + jets final states. 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 ("soft electron tags''). From a sample of 2196 candidate events, we obtain 120 tagged events with a background expectation of 51 +/- 3 events, corresponding to a cross section of sigma(t (t) over bar) = 7.8 +/- 2.4(stat) +/- 1.6(syst) +/- 0.5(lumi) pb. We assume a top-quark mass of 175 GeV/c(2). This is the first measurement of the t (t) over bar cross section with soft electron tags in run II of the Tevatron.
Description18 páginas, 15 figuras, 8 tablas.-- CDF Collaboration: et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevD.81.092002
Appears in Collections:(IFIC) Artículos
(IFCA) Artículos
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