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Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at root s=7 TeV with the ATLAS detector

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Search for heavy vector-like quarks coupling to light quarks in proton-proton collisions at root s=7 TeV with the ATLAS detector

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ATLAS Collaboration; Mitsou, Vasiliki; Fuster Verdú, Juan A.; Ferrer Soria, Antonio; Cabrera Urbán, Susana; García García, Carmen; Castillo Giménez, María Victoria; Higón Rodríguez, Emilio; Martí García, Salvador; Ros Martínez, Eduardo; González de la Hoz, Santiago; Salt Cairols, José; Valls Ferrer, Juan Antonio; Kaci, Mohammed; Fiorini, Luca; Hernández Jiménez, Yesenia; Lacasta Llácer, Carlos; Villaplana Pérez, Miguel

Aquest document és un/a article, creat/da en: 2012

Este documento está disponible también en : 10.1016/j.physletb.2012.03.082

This Letter presents a search for singly produced vector-like quarks, Q, coupling to light quarks, q. The search is sensitive to both charged current (CC) and neutral current (NC) processes, pp -> Qq -> Wqq' and pp -> Qq -> Zqq' with a leptonic decay of the vector gauge boson. In 1.04 fb(-1) of data taken in 2011 by the ATLAS experiment at a center-of-mass energy root s = 7 TeV, no evidence of such heavy vector-like quarks is observed above the expected Standard Model background. Limits on the heavy vector-like quark production cross section times branching ratio as a function of mass m(Q) are obtained. For a coupling K-qQ = v/m(Q), where v is the Higgs vacuum expectation value, 95% C.L. lower limits on the mass of a vector-like quark are set at 900 GeV and 760 GeV from CC and NC processes, respectively.

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