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

Abstract : We search for resonant production of tt¯ pairs in 4.8fb-1 integrated luminosity of pp¯ collision data at s=1.96TeV 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'<900GeV/c2 at 95% confidence level.
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Journal articles
Physical Review D, American Physical Society, 2011, 84, pp.072004. <10.1103/PhysRevD.84.072004>
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http://hal.in2p3.fr/in2p3-00617704
Contributor : Swarna Bassava <>
Submitted on : Tuesday, August 30, 2011 - 11:45:22 AM
Last modification on : Tuesday, October 11, 2016 - 3:21:13 PM

### Citation

T. Aaltonen, B. Álvarez González, S. Amerio, D. Amidei, A. Anastassov, et al.. Search for resonant production of tt̅ pairs in 4.8 fb^-1 of integrated luminosity of pp̅ collisions at √s=1.96 TeV. Physical Review D, American Physical Society, 2011, 84, pp.072004. <10.1103/PhysRevD.84.072004>. <in2p3-00617704>

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