Cargando…
Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$
This thesis presents a search for resonant and standard model non-resonant di-Higgs production in the $b\overline{b}\tau^{+}\tau^{-}$ decay channel, with the semi-leptonic di-tau state. The search uses data collected by the ATLAS experiment at the LHC of $pp$-collisions at $\sqrt{s}=13\textrm{TeV}$...
Autor principal: | |
---|---|
Lenguaje: | eng |
Publicado: |
2018
|
Materias: | |
Acceso en línea: | http://cds.cern.ch/record/2634914 |
_version_ | 1780959784486305792 |
---|---|
author | Stevenson, Thomas James |
author_facet | Stevenson, Thomas James |
author_sort | Stevenson, Thomas James |
collection | CERN |
description | This thesis presents a search for resonant and standard model non-resonant di-Higgs production in the $b\overline{b}\tau^{+}\tau^{-}$ decay channel, with the semi-leptonic di-tau state. The search uses data collected by the ATLAS experiment at the LHC of $pp$-collisions at $\sqrt{s}=13\textrm{TeV}$ during 2015 and 2016, corresponding to an instantaneous luminosity of $36.1\,\mathrm{fb^{-1}}$. No deviation from the Standard Model prediction is observed. For the non-resonant standard model di-Higgs production an upper limit is set on the cross-section compared to the Standard Model prediction, $\frac{\sigma}{\sigma_{\textrm{SM}}}<24.44\;@\;95\% \textrm{CL}$. Upper limits are set on the cross-section times branching ratio for the resonant searches, where the results are interpreted in terms of constraints on a 2HDM heavy scalar Higgs model and a Randall-Sundrum Kaluza-Klein graviton model. The use of Support Vector Machines is investigated and benchmarked against the nominal results of the Boosted Decision Tree multivariate analysis, in pursuit of potential future improvements. |
id | cern-2634914 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2018 |
record_format | invenio |
spelling | cern-26349142019-09-30T06:29:59Zhttp://cds.cern.ch/record/2634914engStevenson, Thomas JamesSearch for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$Particle Physics - ExperimentThis thesis presents a search for resonant and standard model non-resonant di-Higgs production in the $b\overline{b}\tau^{+}\tau^{-}$ decay channel, with the semi-leptonic di-tau state. The search uses data collected by the ATLAS experiment at the LHC of $pp$-collisions at $\sqrt{s}=13\textrm{TeV}$ during 2015 and 2016, corresponding to an instantaneous luminosity of $36.1\,\mathrm{fb^{-1}}$. No deviation from the Standard Model prediction is observed. For the non-resonant standard model di-Higgs production an upper limit is set on the cross-section compared to the Standard Model prediction, $\frac{\sigma}{\sigma_{\textrm{SM}}}<24.44\;@\;95\% \textrm{CL}$. Upper limits are set on the cross-section times branching ratio for the resonant searches, where the results are interpreted in terms of constraints on a 2HDM heavy scalar Higgs model and a Randall-Sundrum Kaluza-Klein graviton model. The use of Support Vector Machines is investigated and benchmarked against the nominal results of the Boosted Decision Tree multivariate analysis, in pursuit of potential future improvements.CERN-THESIS-2018-119oai:cds.cern.ch:26349142018-08-20T09:09:00Z |
spellingShingle | Particle Physics - Experiment Stevenson, Thomas James Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title | Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title_full | Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title_fullStr | Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title_full_unstemmed | Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title_short | Search for di-Higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using Support Vector Machines with the ATLAS detector at the Large Hadron Collider in $pp$ collisions at $\sqrt{s}=13\textrm{TeV}$ |
title_sort | search for di-higgs production to the $b\overline{b}\tau^{+}\tau^{-}$ final state using support vector machines with the atlas detector at the large hadron collider in $pp$ collisions at $\sqrt{s}=13\textrm{tev}$ |
topic | Particle Physics - Experiment |
url | http://cds.cern.ch/record/2634914 |
work_keys_str_mv | AT stevensonthomasjames searchfordihiggsproductiontotheboverlinebtautaufinalstateusingsupportvectormachineswiththeatlasdetectoratthelargehadroncolliderinppcollisionsatsqrts13textrmtev |