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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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.
Annual Report Of The European Organization For Nuclear Research
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Author : European Organization for Nuclear Research
language : en
Publisher:
Release Date : 1994
Annual Report Of The European Organization For Nuclear Research written by European Organization for Nuclear Research and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Nuclear physics categories.
Search For Heavy Resonances Decaying To Top Quark Pairs In The Boosted All Hadronic Decay Channel
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Author : Trisha Farooque
language : en
Publisher:
Release Date : 2013
Search For Heavy Resonances Decaying To Top Quark Pairs In The Boosted All Hadronic Decay Channel written by Trisha Farooque and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Search For New Physics With Top And Bottom Quarks With Atlas
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Author :
language : en
Publisher:
Release Date : 2013
Search For New Physics With Top And Bottom Quarks With Atlas written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
The studies performed by the principal investigator during the period of the grant constitute the ground work for search for new physics in channels including top and bottom quarks with the ATLAS detector at the Large Hadron Collider. The PI has been involved in search for heavy charged Higgs bosons decaying into top and bottom quark pairs, and top quark rare decays involving Higgs bosons and c-quarks. Both channels have the top quark pair production as their main background, which was studied in detail. The search for heavy charged Higgs and top quark rare decays requires signi cant amount of data accumulated by the experiment. In case no signal is observed in the present data sample collected by ATLAS (5 fb−1 of integrated luminosity at proton-anti proton center-of-mass energy of 7 TeV and 20 fb−1 at 8 TeV), data from the upgraded detector running at 14 TeV needs to be analyzed. The PI has been working on physics and performance studies at upgraded detector.
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." --
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.
A Search For Massive Top Quark Resonances With The Atlas Detector At The Large Hadron Collider
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Author : Sarah Stephanie Alexandra Livermore
language : en
Publisher:
Release Date : 2012
A Search For Massive Top Quark Resonances With The Atlas Detector At The Large Hadron Collider written by Sarah Stephanie Alexandra Livermore 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.
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 Pair Produced Resonances Decaying To Jet Pairs In Proton Proton Collisions At Arrow
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Author :
language : en
Publisher:
Release Date : 2015
Search For Pair Produced Resonances Decaying To Jet Pairs In Proton Proton Collisions At Arrow 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.
Results are reported of a general search for pair production of heavy resonances decaying to pairs of jets in events with at least four jets. The study is based on up to 19.4 inverse femtobarns of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.
Search For The Associated Production Of Higgs Boson And Top Quark Pairs In Multijet Events And Calibration Of The B Jet Trigger For The Atlas Detector At The Lhc
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Author : Giovanni Bartolini
language : en
Publisher:
Release Date : 2020
Search For The Associated Production Of Higgs Boson And Top Quark Pairs In Multijet Events And Calibration Of The B Jet Trigger For The Atlas Detector At The Lhc written by Giovanni Bartolini and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.