Cargando…
Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$
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 $\sqrt{s}=7\,\textrm{TeV}$ in 2011 is analysed. The substruc...
Autor principal: | |
---|---|
Lenguaje: | eng |
Publicado: |
2013
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/1622296 |
_version_ | 1780933240580734976 |
---|---|
author | Kasieczka, Gregor |
author_facet | Kasieczka, Gregor |
author_sort | Kasieczka, Gregor |
collection | CERN |
description | 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 $\sqrt{s}=7\,\textrm{TeV}$ 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 $t\overline{t}$ production and multijet production, is observed in the di-top invariant mass spectrum $m_{t\overline{t}}$. Therefore limits on the production cross section times branching fractions of certain models of $Z^{\prime}$ boson and a Kaluza-Klein gluon resonances are set. The production of $Z^{\prime}$ 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. |
id | cern-1622296 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2013 |
record_format | invenio |
spelling | cern-16222962019-09-30T06:29:59Zhttp://cds.cern.ch/record/1622296engKasieczka, GregorSearch for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$Particle Physics - ExperimentA 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 $\sqrt{s}=7\,\textrm{TeV}$ 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 $t\overline{t}$ production and multijet production, is observed in the di-top invariant mass spectrum $m_{t\overline{t}}$. Therefore limits on the production cross section times branching fractions of certain models of $Z^{\prime}$ boson and a Kaluza-Klein gluon resonances are set. The production of $Z^{\prime}$ 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.CERN-THESIS-2013-180oai:cds.cern.ch:16222962013-10-30T18:47:03Z |
spellingShingle | Particle Physics - Experiment Kasieczka, Gregor Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title | Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title_full | Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title_fullStr | Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title_full_unstemmed | Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title_short | Search for Resonances Decaying into Top Quark Pairs Using Fully Hadronic Decays in $pp$ Collisions with ATLAS at $\sqrt{s}$ = 7 $TEV$ |
title_sort | search for resonances decaying into top quark pairs using fully hadronic decays in $pp$ collisions with atlas at $\sqrt{s}$ = 7 $tev$ |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/1622296 |
work_keys_str_mv | AT kasieczkagregor searchforresonancesdecayingintotopquarkpairsusingfullyhadronicdecaysinppcollisionswithatlasatsqrts7tev |