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

AuthorsAaltonen, T.; Álvarez González, B.; Casal, Bruno ; Cuevas, Javier ; Gómez-Ceballos, Guillelmo; Palencia, Enrique ; Rodrigo, Teresa ; Vila, Iván ; Vilar, Rocío ; Vizán, J. ; CDF Collaboration
Issue Date2011
CitationPhysical Review D 84(7): 072004 (2011)
AbstractWe 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.
Identifiersdoi: 10.1103/PhysRevD.84.072004
issn: 0556-2821
Appears in Collections:(IFCA) Artículos
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