TY  - GEN
AV  - public
ID  - heidok14941
Y1  - 2013///
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/14941/
A1  - Kasieczka, Gregor
TI  - Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in pp Collisions with ATLAS at sqrt(s) = 7 TeV

N2  - A search for new particles 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 sqrt(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 or gluons. The performance of this method is evaluated using a statistically independent sample. Top-quark candidates are also required to have a bottom-quark decay associated with them. The backgrounds are estimated using data-driven techniques.


No significant deviation between data and the sum of Standard Model background processes, such as ttbar production and multijet production, is observed in the di-top invariant mass spectrum. Therefore limits on the production cross section times branching fractions of certain models of Z' boson and a Kaluza-Klein gluon resonances are set. The production of Z' bosons with masses between 0.70 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.

ER  -