A search for new particles that decay into top quark pairs (tt̅ ) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb-1 of proton–proton (pp) collision data collected at a center-of-mass energy sqrt(s)=7 TeV. In the tt̅ →WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt̅ system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt̅ invariant mass spectrum is performed. No evidence for a tt̅ resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z′ resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z′ resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with Γ/m=15.3%. A Kaluza–Klein excitation of the gluon in a Randall–Sundrum model is excluded for masses below 2.07 TeV.
A search for ttbar resonances in the lepton plus jets final state with ATLAS using 4.7 fb-1 of pp collisions at sqrt(s) = 7 TeV
BIANCO, MICHELE;GORINI, Edoardo;PRIMAVERA, Margherita;SPAGNOLO, Stefania Antonia;VENTURA, Andrea
2013-01-01
Abstract
A search for new particles that decay into top quark pairs (tt̅ ) is performed with the ATLAS experiment at the LHC using an integrated luminosity of 4.7 fb-1 of proton–proton (pp) collision data collected at a center-of-mass energy sqrt(s)=7 TeV. In the tt̅ →WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The tt̅ system is reconstructed using both small-radius and large-radius jets, the latter being supplemented by a jet substructure analysis. A search for local excesses in the number of data events compared to the Standard Model expectation in the tt̅ invariant mass spectrum is performed. No evidence for a tt̅ resonance is found and 95% credibility-level limits on the production rate are determined for massive states predicted in two benchmark models. The upper limits on the cross section times branching ratio of a narrow Z′ resonance range from 5.1 pb for a boson mass of 0.5 TeV to 0.03 pb for a mass of 3 TeV. A narrow leptophobic topcolor Z′ resonance with a mass below 1.74 TeV is excluded. Limits are also derived for a broad color-octet resonance with Γ/m=15.3%. A Kaluza–Klein excitation of the gluon in a Randall–Sundrum model is excluded for masses below 2.07 TeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
