We search for evidence of resonant top quark pair production in 955 pb(-1) of p (p) over bar collisions at root s = 1,96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate t (t) over bar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t (t) over bar pairs to the expected superposition of standard model t (t) over bar, non-t (t) over bar backgrounds, and a simple resonance model based on a sequential Z' boson. We establish upper limits for sigma(p (p) over bar -> Z')xBr(Z' -> t (t) over bar) in the Z' mass interval from 450 GeV/c(2) to 900 GeV/c(2). A topcolor leptophobic Z' is ruled out below 720 GeV/c(2), and the cross section of any narrow Z'-like state decaying to t (t) over bar is found to be less than 0.64 pb at 95% C. L. for M(Z') above 700 GeV/c(2).

Limits on the production of narrow t(t)over-bar resonances in p(p)over-bar collisions at root s=1.96 TeV

CIOCCI, MARIA AGNESE;DONATI, SIMONE;
2008-01-01

Abstract

We search for evidence of resonant top quark pair production in 955 pb(-1) of p (p) over bar collisions at root s = 1,96 TeV recorded with the CDF II detector at the Fermilab Tevatron. For fully reconstructed candidate t (t) over bar events triggered on leptons with large transverse momentum and containing at least one identified b-quark jet, we compare the invariant mass spectrum of t (t) over bar pairs to the expected superposition of standard model t (t) over bar, non-t (t) over bar backgrounds, and a simple resonance model based on a sequential Z' boson. We establish upper limits for sigma(p (p) over bar -> Z')xBr(Z' -> t (t) over bar) in the Z' mass interval from 450 GeV/c(2) to 900 GeV/c(2). A topcolor leptophobic Z' is ruled out below 720 GeV/c(2), and the cross section of any narrow Z'-like state decaying to t (t) over bar is found to be less than 0.64 pb at 95% C. L. for M(Z') above 700 GeV/c(2).
2008
T., Aaltonen; J., Adelman; T., Akimoto; M. G., Albrow; B. A., Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; M., Aoki; G., A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/828921
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