Search for t(t)over-bar resonances in the lepton plus jets final state with ATLAS using 4.7 fb(-1) of pp collisions at root s=7 TeV
| Autor: | ATLAS Collaboration, Cabrera Urbán, Susana, Castillo Giménez, María Victoria, Costa Mezquita, María José, Fassi, Farida, Ferrer Soria, Antonio, Fiorini, Luca, Fuster Verdú, Juan A., García García, Carmen, García Navarro, José Enrique, González de la Hoz, Santiago, Hernández Jiménez, Yesenia, Higón Rodríguez, Emilio, Irles Quiles, Adrián, Kaci, Mohammed, Lacasta Llácer, Carlos, Lacuesta Miquel, Vicente, March Ruiz, Luis, Martí García, Salvador, Miñano Moya, Mercedes, Mitsou, Vasiliki, Moles Valls, Regina, Moreno Llácer, María, Oliver García, Elena, Pedraza López, Sebastián, Pérez García-Estañ, María Teresa, Romero Adam, E., Ros Martínez, Eduardo, Salt Cairols, José, Sánchez Martínez, Victoria, Soldevila, U., Sánchez Martínez, Javier, Torró Pastor, Emma, Valero Biot, Alberto, Valladolid Gallego, E., Valls Ferrer, Juan Antonio, Villaplana Pérez, Miguel, Vos, Marcel |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: | |
| Zdroj: | ATLAS Collaboration Cabrera Urbán, Susana Castillo Giménez, María Victoria Costa Mezquita, María José Fassi, Farida Ferrer Soria, Antonio Fiorini, Luca Fuster Verdú, Juan A. García García, Carmen García Navarro, José Enrique González de la Hoz, Santiago Hernández Jiménez, Yesenia Higón Rodríguez, Emilio Irles Quiles, Adrián Kaci, Mohammed Lacasta Llácer, Carlos Lacuesta Miquel, Vicente March, L. Martí García, Salvador Miñano Moya, Mercedes Mitsou, Vasiliki Moles Valls, Regina Moreno Llácer, María Oliver García, Elena Pedraza López, Sebastián Pérez García-Estañ, María Teresa Romero Adam, E. Ros Martínez, Eduardo Salt Cairols, José Sánchez Martínez, V. Soldevila, U. Sánchez, J. Torró Pastor, Emma Valero, A. Valladolid Gallego, E. Valls Ferrer, Juan Antonio Villaplana Pérez, Miguel Vos, Marcel 2013 Search for t(t)over-bar resonances in the lepton plus jets final state with ATLAS using 4.7 fb(-1) of pp collisions at root s=7 TeV Physical Review D 88 1 012004-1 012004-28 RODERIC. Repositorio Institucional de la Universitat de Valéncia instname |
| Popis: | A search for new particles that decay into top quark pairs (t (t) over bar) 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 root s = 7 TeV. In the t (t) over bar) -> WbWb decay, the lepton plus jets final state is used, where one W boson decays leptonically and the other hadronically. The t (t) over bar) 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 t (t) over bar) invariant mass spectrum is performed. No evidence for a t (t) over bar) 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 m 15.3%. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.07 TeV. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|