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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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.
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.
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.
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
language : en
Publisher:
Release Date : 2014
A Search For Massive Resonances Decaying To Top Quark Pairs And Jet Trigger Performance Studies With The Atlas Detector At The Large Hadron Collider written by Luz Stella Gomez Fajardo 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.
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 T Overline T Resonances Using Lepton Plus Jets Events In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
A Search For T Overline T Resonances Using Lepton Plus Jets Events 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 2015 with categories.
A search for new particles that decay into top quark pairs is reported. The search is performed with the ATLAS experiment at the LHC using an integrated luminosity of 20.3 fb-1 of proton-proton collision data collected at a centre-of-mass energy of \(\sqrt{s}=8 \) TeV. The lepton-plus-jets final state is used, where the top pair decays to \({W}^{+}b{W}^{-}\overline{b} \), with one W boson decaying leptonically and the other hadronically. The invariant mass spectrum of top quark pairs is examined for local excesses or deficits that are inconsistent with the Standard Model predictions. No evidence for a top quark pair resonance is found, and 95% confidence-level limits on the production rate are determined for massive states in benchmark models. The upper limits on the cross-section times branching ratio of a narrow Z' boson decaying to top pairs range from 4.2 pb to 0.03 pb for resonance masses from 0.4 TeV to 3.0 TeV. A narrow leptophobic topcolour Z' boson with mass below 1.8 TeV is excluded. Upper limits are set on the cross-section times branching ratio for a broad colour-octet resonance with [Gamma]/m = 15% decaying to \(t\overline{t} \). These range from 4.8 pb to 0.03 pb for masses from 0.4 TeV to 3.0 TeV. A Kaluza-Klein excitation of the gluon in a Randall-Sundrum model is excluded for masses below 2.2 TeV.
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 Massive Top Resonances Using Jet Substructure At Cms
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Author : James W. Dolen
language : en
Publisher:
Release Date : 2012
Search For Massive Top Resonances Using Jet Substructure At Cms written by James W. Dolen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A search is presented for a new massive particle, generically referred to as a Z', decaying into a top anti-top quark pair, which then decay hadronically. The search focuses on Z' resonances that are sufficiently massive to produce highly Lorentz-boosted top quarks, which yield collimated decay products that are partially or fully merged into single jets. The analysis uses new methods to analyze jet substructure, providing suppression of the non-top multijet backgrounds. The analysis uses data collected by the Compact Muon Solenoid (CMS) experiment at the Large Hadron Collider (LHC) at CERN in 2011. The dataset contains 4.92 fb−1 of integrated luminosity from proton-proton collisions at a center of mass energy of 7 TeV. Upper limits in the range of 1 pb are set on the product of the production cross section and branching fraction for a topcolor Z' modeled for several widths, as well as for a Randall-Sundrum Kaluza-Klein gluon. In addition, any enhancement to t t-bar production for invariant masses above 1 TeV/c2 in the standard model is constrained.
Search For Heavy Resonances Decaying To Tau Lepton Pairs In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Search For Heavy Resonances Decaying To Tau Lepton Pairs 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 2016 with categories.
A search for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at \sqrt{s}$ = 13 TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 inverse femtobarns. The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z' bosons decaying into tau lepton pairs is excluded for Z' masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z' bosons that preferentially couple to third-generation fermions, Z' masses below 1.7 TeV are excluded, representing the most stringent limit to date.
Search For Resonant Production Of Top Antitop Pairs Decaying Into Multi Jets At The Collider Detector At Fermilab
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Author : Yuri Oksuzian
language : en
Publisher:
Release Date : 2009
Search For Resonant Production Of Top Antitop Pairs Decaying Into Multi Jets At The Collider Detector At Fermilab written by Yuri Oksuzian and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with categories.
ABSTRACT: We performed a search for"non-standard model tṫ resonances in the all jets final state channel." The main goal was to examine top-antitop invariant mass spectrum for the presence of narrow resonant states. The data analysis used 2.8fb−1 of CDF data; events were produced at the Tevatron collider in p[bar p] collisions with center-of-mass energy of 1.96 TeV. 2086 data events were analyzed and compared to Standard Model expectation. No evidence for new tṫ resonant production mechanisms was found. Upper limits were placed on the cross-section times branching ratio for resonance production at 805 GeV/c2. For signal modeling we considered leptophobic Z' boson in a topcolor-assisted technicolor model with the width of [capital gamma]= 1.2%MX0.