Dresden 2013 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 57: Suche nach neuer Physik 3
T 57.3: Vortrag
Dienstag, 5. März 2013, 17:15–17:30, WIL-C133
Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in pp Collisions with ATLAS at √s = 7 TeV — Christoph Anders, •Gregor Kasieczka, Sebastian Schätzel, André Schöning, and David Sosa — Physikalisches Institut, Universit"at Heidelberg
A search for heavy resonances that decay into top-quark pairs producing two massive jets with high transverse momentum is presented. Data collected with the ATLAS detector at the Large Hadron Collider during the proton–proton collision run at √s=7 TeV in 2011 is analysed.
The substructure-based HEPTopTagger technique is used to separate top-quark jets from those arising from light quarks and gluons. Top-quark candidates are also required to have evidence of an associated bottom-quark decay. The backgrounds are estimated using data-driven techniques.
No significant deviation between data and the sum of Standard Model background processes, such as tt production and multijet production, is observed in the di-top invariant mass spectrum mtt. Therefore limits on the production cross section times branching fractions of a Z′ boson and a Kaluza-Klein gluon resonance are set. Production of Z′ bosons with masses between 0.72 and 1.00 TeV as well as 1.28 and 1.32 TeV and Kaluza-Klein gluons with masses between 0.70 and 1.48 TeV is excluded at 95% C.L.