Search For Top Antitop Quark Resonances In The Lepton Jets Final State With The Cms Detector Preparing The Run 3 Analysis
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Search For Top Antitop Quark Resonances In The Lepton Jets Final State With The Cms Detector Preparing The Run 3 Analysis
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Author : Johanna Matthiesen
language : en
Publisher:
Release Date : 2023
Search For Top Antitop Quark Resonances In The Lepton Jets Final State With The Cms Detector Preparing The Run 3 Analysis written by Johanna Matthiesen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023 with categories.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 2004
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004 with Dissertations, Academic categories.
Search For Heavy Resonance Decays Into Top Quark Pairs Using A Lepton Plus Jets Final State In Proton Proton Collisions At S
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Author : Kyle Krowpman
language : en
Publisher:
Release Date : 2022
Search For Heavy Resonance Decays Into Top Quark Pairs Using A Lepton Plus Jets Final State In Proton Proton Collisions At S written by Kyle Krowpman and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022 with Electronic dissertations categories.
This thesis presents two studies in a search for new heavy resonances with 139 fb-1 of proton-proton collisions delivered by the Large Hadron Collider at √s = 13 TeV as measured by the ATLAS detector. In many Standard Model extensions, the top quark plays an important role in the dynamics of electroweak symmetry breaking, and so the studies presented here focus on heavy resonance searches in the top-antitop decay channel and their combination with searches for heavy resonances decaying into other final states. The first study detailed in this thesis is a search for new heavy resonances in a semileptonically decaying top-antitop final state where no significant excesses of data were observed with respect to the background prediction. That being so, exclusion limits at the 95% confidence level were placed on possible resonant masses for a Z′ in a leptophobic topcolor-assisted technicolor model and for a bulk Randall-Sundrum graviton at 4.2 TeV and 1.0 TeV, respectively. This top-antitop search was combined with searches in orthogonal final states performed by the ATLAS Collaboration from which limit contours were placed at the 95% confidence level in the space of couplings to Standard Model particles for the Heavy Vector Triplet model.
Search For Mathrm T Bar T Resonances In Highly Boosted Lepton Jets And Fully Hadronic Final States In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Search For Mathrm T Bar T Resonances In Highly Boosted Lepton Jets And Fully Hadronic Final States In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
A search for the production of heavy resonances decaying into top quark-antiquark pairs is presented. The analysis is performed in the lepton+jets and fully hadronic channels using data collected in proton-proton collisions at $\sqrt{s}$ =13 TeV using the CMS detector at the LHC, corresponding to an integrated luminosity of 2.6 inverse femtobarns. The selection is optimized for massive resonances, where the top quarks have large Lorentz boosts. No evidence for resonant ttbar production is found in the data, and upper limits on the production cross section of heavy resonances are set. The exclusion limits for resonances with masses above 2 TeV are significantly improved compared to those of previous analyses at $\sqrt{s}$ = 8 TeV.
Search For Resonant T Bar T Production In Proton Proton Collisions At U221a S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Resonant T Bar T Production In Proton Proton Collisions At U221a S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
A search is performed for the production of heavy resonances decaying into top-antitop quark pairs in proton-proton collisions at √s = 8 TeV. Data used for the analyses were collected with the CMS detector and correspond to an integrated luminosity of 19.7 fb–1. The search is performed using events with three different final states, defined by the number of leptons (electrons and muons) from the tt¯ → WbWb decay. The analyses are optimized for reconstruction of top quarks with high Lorentz boosts, where jet substructure techniques are used to enhance the sensitivity. Results are presented for all channels and a combination is performed. Furthermore, no significant excess of events relative to the expected yield from standard model processes is observed.
Search For A Heavy Resonance Decaying To A Top Quark And A Vector Like Top Quark At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2017
Search For A Heavy Resonance Decaying To A Top Quark And A Vector Like Top Quark At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
A search is presented for massive spin-1 Z' resonances decaying to a top quark and a heavy vector-like top quark partner T. The search is based on a 2.6 inverse femtobarns sample of proton-proton collisions at 13 TeV collected with the CMS detector at the LHC. The analysis is optimized for final states in which the T quark decays to a W boson and a bottom quark. The focus is on all-jet final states in which both the W boson and the top quark decay into quarks that evolve into jets. The decay products of the top quark and of the W boson are assumed to be highly Lorentz-boosted and cannot be reconstructed as separate jets, but are instead reconstructed as merged, wide jets. Techniques for the identification of jet substructure and jet flavour are used to distinguish signal from background events. Several models for Z' bosons decaying to T quarks are excluded at 95% confidence level, with upper limits on the cross section ranging from 0.13 to 10 pb, depending on the chosen hypotheses. This is the first search for a neutral spin-1 heavy resonance decaying to a top quark and a vector-like T quark in the all-hadronic final state.
A Search For Tt Resonances In The Single Lepton Final State With The Atlas Experiment
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Author : Andrew David Altheimer
language : en
Publisher:
Release Date : 2014
A Search For Tt Resonances In The Single Lepton Final State With The Atlas Experiment written by Andrew David Altheimer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
A search for undiscovered particles decaying into top-antitop quark pairs produced in proton-proton collisions with the ATLAS experiment at the Large Hadron Collider utilizing 20.3 fb$^-1$ of data collected at $\sqrt{s}=8$ \tev\ center-of-mass energy during the 2012 data taking period is presented. The invariant mass spectrum of events containing multiple jets, exactly one lepton, and missing transverse energy and which are consistent with the decay of a top-antitop quark pair is studied and found to be consistent with that predicted by the Standard Model. Upper limits on the production cross section times branching ratio of several benchmark signal models are set at a 95\% confidence level.
Search For Top Antitop Quark Resonances With The Atlas Detector At The Large Hadron Collider
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Author : Bertrand Chapleau
language : en
Publisher:
Release Date : 2014
Search For Top Antitop Quark Resonances With The Atlas Detector At The Large Hadron Collider written by Bertrand Chapleau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
"The intriguing nature of the top quark, by far the heaviest particle in the Standard Model of particle physics, has motivated the development of many theoretical extensions predicting the existence of new massive particles decaying to a pair of top-antitop quarks. The production of these hypothetical particles in proton-proton collisions at the Large Hadron Collider would reveal itself as a resonance in the expected smooth distribution of the top-antitop quark invariant mass. This thesis presents a search for such a new heavy particle decaying to a pair of top-antitop quarks in the semi-leptonic final state. The analyzed data sample amounts to a total of 4.6 fb-1 at a proton-proton collision center-of-mass energy of 7 TeV. Novel techniques specifically tailored to the identification of the decay products of highly energetic top quarks are developed and used. No evidence for resonant production of pairs of top-antitop quarks is found and, as a result, constraints are set on two theoretical models. Upper limits on the production cross-section times branching ratio are established at a 95% credibility level for a leptophobic Zʹ boson from the Topcolor model, and a Kaluza-Klein gluon from the Randall-Sundrum model. The Zʹ boson and the Kaluza-Klein gluon are excluded to exist (at a 95% credibility level) in the mass ranges 0.8-1.65 TeV and 0.8-1.88 TeV, respectively. The constraints de- rived in this thesis on the two theoretical models are more stringent than the ones obtained at other experiments, thanks to the large center-of-mass energy and the dedicated high-energy top quark identification techniques used." --
Analytic Mass Reconstruction Of Top Antitop Resonances In The Dilepton Channel At Atlas
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Author : Michelle Renée Boudreau
language : en
Publisher:
Release Date : 2012
Analytic Mass Reconstruction Of Top Antitop Resonances In The Dilepton Channel At Atlas written by Michelle Renée Boudreau and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Leptons (Nuclear physics) categories.
Many theories beyond the Standard Model predict new massive particles that decay preferentially to top-antitop quark pairs. This thesis investigates the dilepton final state where both W bosons from the top quarks decay into leptons. This final state features the highest purity for top quarks but is kinematically under-constrained due to the presence of the two neutrinos that leave the ATLAS detector undetected. Using kinematic constraints from the top-antitop quark decay chain, along with the missing energy, leptons, and jets, that are measured with the ATLAS detector, a set of analytic solutions for the four-vectors of the neutrinos can be obtained. With this information, the invariant mass can be reconstructed up to a four-fold ambiguity. Methods used to eliminate incorrect neutrino solutions are investigated and characterized. For a resonance particle with a mass much larger than the top quark mass, the top quarks will be highly boosted, resulting in collimated decay products of the top quark. Optimizing the lepton selection in such an environment is very important and is also discussed.
A Search For Massive Resonances In Final States With Boosted Top Antitop Pairs Decaying Into A Lepton And Jets With The Atlas Detector At The Large Hadron Collider
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Author : Janna Katharina Behr
language : en
Publisher:
Release Date : 2015
A Search For Massive Resonances In Final States With Boosted Top Antitop Pairs Decaying Into A Lepton And Jets With The Atlas Detector At The Large Hadron Collider written by Janna Katharina Behr and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.