We search for resonant production of ttÌ pairs in 4.8fb-1 integrated luminosity of ppÌ collision data at âs=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 ttÌ candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant ttÌ production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of ttÌ pairs. A benchmark model of leptophobic Zâ²âttÌ is excluded with mZâ²<900GeV/c2 at 95% confidence level. © 2011 American Physical Society.
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
Manca, G.;
2011-01-01
Abstract
We search for resonant production of ttÌ pairs in 4.8fb-1 integrated luminosity of ppÌ collision data at âs=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 ttÌ candidate invariant mass is sampled. These probability density functions are used to construct a likelihood function, whereby the cross section for resonant ttÌ production is estimated, given a hypothetical resonance mass and width. The data indicate no evidence of resonant production of ttÌ pairs. A benchmark model of leptophobic Zâ²âttÌ is excluded with mZâ²<900GeV/c2 at 95% confidence level. © 2011 American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.