We search for resonant production of t (t) over bar pairs in 4.8 fb(-1) integrated luminosity of p (p) over bar collision data at root 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 t (t) over bar candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant t (t) over bar production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of t (t) over bar pairs. A benchmark model of leptophobic Z' -> t (t) over bar is excluded with m(Z') < 900 GeV/c(2) at 95% confidence level.

Search for resonant production of t(t)over-bar pairs in 4.8 fb(-1) of integrated luminosity of p(p)over-bar collisions at root s=1.96 TeV

DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;Ruffini F.;
2011-01-01

Abstract

We search for resonant production of t (t) over bar pairs in 4.8 fb(-1) integrated luminosity of p (p) over bar collision data at root 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 t (t) over bar candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant t (t) over bar production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of t (t) over bar pairs. A benchmark model of leptophobic Z' -> t (t) over bar is excluded with m(Z') < 900 GeV/c(2) at 95% confidence level.
2011
Aaltonen, T.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A.; Annovi, A.; Antos, J.; Apollinari, G.; Appel, J. A.; Arisawa, T.; Artikov,...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/148687
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