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Open Access item Search for resonant production of tt in 4.8  fb-1 of integrated luminosity of pp̅ collisions at √s=1.96  TeV

Authors:Aaltonen, T.
Álvarez González, B.
Casal, Bruno
Cuevas, Javier
Gómez-Ceballos, Guillelmo
Palencia, Enrique
Rodrigo, Teresa
Vila, Iván
Vilar, Rocío
Vizán, J.
CDF Collaboration
Issue Date:2011
Citation:Physical Review D 84(7): 072004 (2011)
Abstract:We search for resonant production of tt pairs in 4.8  fb-1 integrated luminosity of pp̅ collision data at √s=1.96  TeV in the lepton+jets decay channel, where one top quark decays leptonically and the other hadronically. A matrix-element reconstruction technique is used; for each event a probability density function of the tt candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant tt production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of tt pairs. A benchmark model of leptophobic Z′→tt is excluded with mZ′<900  GeV/c2 at 95% confidence level.
URI:http://hdl.handle.net/10261/52067
Identifiers:doi: 10.1103/PhysRevD.84.072004
issn: 0556-2821
Appears in Collections:(IFCA) Artículos

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