Details

Autor(en) / Beteiligte

• Aad, G.
• Albrand, S.
• Buat, Q.
• Clement, B.
• Collot, J.
• Crépé-Renaudin, S.
• Dechenaux, B.
• Delemontex, T.
• Delsart, P.A.
• Genest, M.H.
• Hostachy, J.Y.
• Laisne, E.
• Ledroit-Guillon, F.
• Lleres, A.
• Lucotte, A.
• Malek, F.
• Monini, C.
• Stark, J.
• Sun, X.
• Trocmé, B.
• Weydert, C.
• Biscarat, C.
• Rahal, G.
• Abdel Khalek, S.
• Andari, N.
• Augé, E.
• Benoit, M.
• Binet, S.
• Bourdarios, C.
• de La Taille, C.
• de Vivie de Regie, J.B.
• Duflot, L.
• Escalier, M.
• Fayard, L.
• Fournier, D.
• Grivaz, J.-F.
• Henrot-Versillé, S.
• Hrivnac, J.
• Iconomidou-Fayard, L.
• Idarraga, J.
• Kado, M.
• Lorenzo Martinez, N.
• Lounis, A.
• Makovec, N.
• Niedercorn, F.
• Poggioli, L.
• Puzo, P.
• Renaud, A.
• Rousseau, D.
• Rybkin, G.
• Sauvan, J.B.
• Schaarschmidt, J.
• Schaffer, A.C.
• Serin, L.
• Simion, S.
• Tanaka, R.
• Teinturier, M.
• Veillet, J.J.
• Zerwas, D.
• Zhang, Zhiqing
• Boumediene, D.
• Busato, Emmanuel
• Calvet, D.
• Calvet, S.
• Camacho Toro, Reina Coromoto
• Donini, J.
• Dubreuil, E.
• Ghodbane, N.
• Gris, Ph
• Guicheney, C.
• Liao, H.
• Pallin, D.
• Paredes Hernández, Daniela
• Podlyski, F.
• Santoni, C.
• Theveneaux-Pelzer, Timothée
• Valery, Loïc
• Vazeille, F.
• Aperio Bella, L.
• Berger, N.
• Colas, J.
• Delmastro, M.
• Di Ciaccio, L.
• Doan, T.K.O.
• Elles, S.
• Goy, C.
• Hryn'Ova, T.
• Jézéquel, S.
• Keoshkerian, H.
• Lafaye, R.
• Leveque, J.
• Lombardo, V.P.
• Maeno, M.
• Massol, N.
• Perrodo, P.
• Petit, E.
• Przysiezniak, H.
• Richter-Was, E.
• Sauvage, G.
• Sauvan, E.

Titel

Search for $t\bar t$ resonances in the lepton plus jets final state with ATLAS using 4.7 fb$^{-1}$ of $pp$ collisions at $\sqrt{s} = 7$ TeV

Ist Teil von

• Physical review. D, 2013-05, Vol.88

Ort / Verlag

American Physical Society

Erscheinungsjahr

2013

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• A search for new particles that decay into top quark pairs (ttbar) 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 ttbar --> WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The ttbar 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 ttbar invariant mass spectrum is performed. No evidence for a ttbar 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 Gamma/m = 15.3%. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.07 TeV.