A Search For Massive Resonances Decaying To Top Quark Pairs And Jet Trigger Performance Studies With The Atlas Detector At The Large Hadron Collider
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Author | : Luz Stella Gomez Fajardo |
Publisher | : |
Total Pages | : 0 |
Release | : 2014 |
Genre | : |
ISBN | : |
Download A Search for Massive Resonances Decaying to Top Quark Pairs and Jet Trigger Performance Studies with the ATLAS Detector at the Large Hadron Collider Book in PDF, Epub and Kindle
Author | : Trisha Farooque |
Publisher | : |
Total Pages | : |
Release | : 2013 |
Genre | : |
ISBN | : |
Download Search for Heavy Resonances Decaying to Top Quark Pairs in the Boosted All-Hadronic Decay Channel Book in PDF, Epub and Kindle
Author | : Janna Katharina Behr |
Publisher | : |
Total Pages | : |
Release | : 2015 |
Genre | : |
ISBN | : |
Download 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 Book in PDF, Epub and Kindle
Author | : Sarah Stephanie Alexandra Livermore |
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Total Pages | : |
Release | : 2012 |
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Download A Search for Massive Top Quark Resonances with the ATLAS Detector at the Large Hadron Collider Book in PDF, Epub and Kindle
Author | : Bertrand Chapleau |
Publisher | : |
Total Pages | : |
Release | : 2014 |
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Download Search for Top-antitop Quark Resonances with the ATLAS Detector at the Large Hadron Collider Book in PDF, Epub and Kindle
"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." --
Author | : Kyle Krowpman |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
Genre | : Electronic dissertations |
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Download Search for Heavy Resonance Decays Into Top-quark Pairs Using a Lepton-plus-jets Final State in Proton-proton Collisions at √s Book in PDF, Epub and Kindle
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.
Author | : Lydia Audrey Beresford |
Publisher | : Springer |
Total Pages | : 175 |
Release | : 2018-09-04 |
Genre | : Science |
ISBN | : 331997520X |
Download Searches for Dijet Resonances Book in PDF, Epub and Kindle
This book addresses one of the most intriguing mysteries of our universe: the nature of dark matter. The results presented here mark a significant and substantial contribution to the search for new physics, in particular for new particles that couple to dark matter. The first analysis presented is a search for heavy new particles that decay into pairs of hadronic jets (dijets). This pioneering analysis explores unprecedented dijet invariant masses, reaching nearly 7 TeV, and sets constraints on several important new physics models. The two subsequent analyses focus on the difficult low dijet mass region, down to 200 GeV, and employ a novel technique to efficiently gather low-mass dijet events. The results of these analyses transcend the long-standing constraints on dark matter mediator particles set by several existing experiments.
Author | : Stephen Swedish |
Publisher | : |
Total Pages | : |
Release | : 2014 |
Genre | : |
ISBN | : |
Download Searches for New Resonances Decaying to Top-antitop Quark Pairs with the ATLAS Detector in Sqrt(s) Book in PDF, Epub and Kindle
Author | : Gregor Kasieczka |
Publisher | : |
Total Pages | : 155 |
Release | : 2013 |
Genre | : |
ISBN | : |
Download Search for Resonances Decaying Into Top Quark Pairs Using Fully Hadronic Decays in Pp Collisions with ATLAS at Sqrt(s) Book in PDF, Epub and Kindle
Author | : Gregor Kasieczka |
Publisher | : |
Total Pages | : 155 |
Release | : 2013 |
Genre | : |
ISBN | : |
Download Search for Resonances Decaying Into Top Quark Pairs Using Fully Hadronic Decays in Pp Collisions with ATLAS at √s _327 7 TeV Book in PDF, Epub and Kindle