Search For The Associated Production Of A Single Top Quark And A Higgs Boson In The H To Bbbar Decay Channel At 8 And 13 Tev With The Cms Experiment
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Search For The Associated Production Of A Single Top Quark And A Higgs Boson In The H To Bbbar Decay Channel At 8 And 13 Tev With The Cms Experiment
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Author : Benedikt Maier
language : en
Publisher:
Release Date : 2016
Search For The Associated Production Of A Single Top Quark And A Higgs Boson In The H To Bbbar Decay Channel At 8 And 13 Tev With The Cms Experiment written by Benedikt Maier 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.
Graduate Programs In The Physical Sciences Mathematics Agricultural Sciences The Environment And Natural Resources 2009
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Author : Peterson's
language : en
Publisher: Peterson Nelnet Company
Release Date : 2007-11
Graduate Programs In The Physical Sciences Mathematics Agricultural Sciences The Environment And Natural Resources 2009 written by Peterson's and has been published by Peterson Nelnet Company this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007-11 with Education categories.
The six volumes of Peterson's Annual Guides to Graduate Study, the only annually updated reference work of its kind, provide wide-ranging information on the graduate and professional programs offered by accredited colleges and universities in the United States and U.S. territories and those in Canada, Mexico, Europe, and Africa that are accredited by U.S. accrediting bodies. Books 2 through 6 are divided into sections that contain one or more directories devoted to individual programs in a particular field. Book 4 contains more than 3,800 programs of study in 56 disciplines of the physical sciences, mathematics, agricultural sciences, the environment, and natural resources.
Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Gamma Gamma Decay Channel At The Atlas Experiment
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Author : Isabel Nitsche
language : en
Publisher:
Release Date : 2019
Search For Higgs Boson Production In Association With A Single Top Quark And Constraints On The H B Jets Background In The H Gamma Gamma Decay Channel At The Atlas Experiment written by Isabel Nitsche and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Measurements And Searches With Top Quarks
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Author :
language : en
Publisher:
Release Date : 2008
Measurements And Searches With Top Quarks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with categories.
In 1995 the last missing member of the known families of quarks, the top quark, was discovered by the CDF and D0 experiments at the Tevatron, a proton-antiproton collider at Fermilab near Chicago. Until today, the Tevatron is the only place where top quarks can be produced. The determination of top quark production and properties is crucial to understand the Standard Model of particle physics and beyond. The most striking property of the top quark is its mass--of the order of the mass of a gold atom and close to the electroweak scale--making the top quark not only interesting in itself but also as a window to new physics. Due to the high mass, much higher than of any other known fermion, it is expected that the top quark plays an important role in electroweak symmetry breaking, which is the most prominent candidate to explain the mass of particles. In the Standard Model, electroweak symmetry breaking is induced by one Higgs field, producing one additional physical particle, the Higgs boson. Although various searches have been performed, for example at the Large Electron Positron Collider (LEP), no evidence for the Higgs boson could yet be found in any experiment. At the Tevatron, multiple searches for the last missing particle of the Standard Model are ongoing with ever higher statistics and improved analysis techniques. The exclusion or verification of the Higgs boson can only be achieved by combining many techniques and many final states and production mechanisms. As part of this thesis, the search for Higgs bosons produced in association with a top quark pair (t{bar t}H) has been performed. This channel is especially interesting for the understanding of the coupling between Higgs and the top quark. Even though the Standard Model Higgs boson is an attractive candidate, there is no reason to believe that the electroweak symmetry breaking is induced by only one Higgs field. In many models more than one Higgs boson are expected to exist, opening even more channels to search for charged or neutral Higgs bosons. Depending on its mass, the charged Higgs boson is expected to decay either into top quarks or be the decay product of a top quark. For masses below the top quark mass, the top decay into a charged Higgs boson and a b quark can occur at a certain rate, additionally to the decays into W bosons and a b quark. The different decays of W and charged Higgs bosons can lead to deviations of the observed final number of events in certain final states with respect to the Standard Model expectation. A global search for charged Higgs bosons in top quark pair events is presented in this thesis, resulting in the most stringent limits to-date. Besides the decay of top quarks into charged Higgs or W bosons, new physics can also show up in the quark part of the decay. While in the Standard Model the top quark decays with a rate of about 100% into a W boson and a b quark, there are models where the top quark can decay into a W boson and a non-b quark. The ratio of branching fractions in which the top quark decays into a b quark over the branching fractions in which the top quark decays into all quarks is measured as part of this thesis, yielding the most precise measurement today. Furthermore, the Standard Model top quark pair production cross section is essential to be known precisely since the top quark pair production is the main background for t{bar t}H production and many other Higgs and beyond the Standard Model searches. However, not only the search or the test of the Standard Model itself make the precise measurement of the top quark pair production cross section interesting. As the cross section is calculated with high accuracy in perturbative QCD, a comparison of the measurement to the theory expectation yields the possibility to extract the top quark mass from the cross section measurement. Although many dedicated techniques exist to measure the top quark mass, the extraction from the cross section represents an important complementary measurement. The latter is briefly discussed in this thesis and compared to direct top mass measurements. The goal of this thesis is the improved understanding of the top quark sector and its use as a window to new physics. Techniques are extended and developed to measure the top quark pair production cross section simultaneously with the ratio of branching fractions, the t{bar t}H cross section or the rate with which top quarks decay into charged Higgs bosons. Some of the results are then taken to extract more information. The cross section measurement is used to extract the top quark mass, and the ratio of the top quark pair production cross sections in different final states, yielding a limit on non-Standard Model top quark decays.
Observation Of Higgs Boson Production In Association With A Top Quark Antiquark Pair In The Diphoton Decay Channel
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Author : Samuel James May
language : en
Publisher:
Release Date : 2020
Observation Of Higgs Boson Production In Association With A Top Quark Antiquark Pair In The Diphoton Decay Channel written by Samuel James May 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.
This dissertation presents the first observation of Higgs boson production in association with a top quark-antiquark pair in the diphoton decay channel, with a significance of 6.6 standard deviations. The measurement is performed with a dataset of 13 TeV proton-proton collisions recorded by the Compact Muon Solenoid (CMS) detector at the CERN Large Hadron Collider (LHC), corresponding to an integrated luminosity of 137 fb−1.
Search For A Higgs Boson In The Mass Range From 145 To 1000 Gev Decaying To A Pair Of W Or Z Bosons
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Author :
language : en
Publisher:
Release Date : 2015
Search For A Higgs Boson In The Mass Range From 145 To 1000 Gev Decaying To A Pair Of W Or Z Bosons 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 a heavy Higgs boson in the H 2!WW and H 2!ZZ decay channels is reported. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at [arrow]" = 7 TeV and up to 19.7fb-1 at [arrow]" = 8 TeV, recorded by the CMS experiment at the CERN LHC. Several final states of the H 2!WW and H 2!ZZ decays are analyzed. The combined upper limit at the 95% confidence level on the product of the cross section and branching fraction exclude a Higgs boson with standard model-like couplings and decays in the range 145
Seeing A Single Top Quark
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Author : Harish Potti
language : en
Publisher:
Release Date : 2020
Seeing A Single Top Quark written by Harish Potti 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.
The top quark is the heaviest known elementary particle. With a coupling to the Higgs boson close to unity, the top quark plays a special role in electroweak symmetry breaking as well as in physics beyond the Standard Model. An accurate measurement of its properties can provide key information for understanding the physics at the TeV scale. In this dissertation, two measurements of the top quark properties are presented. The first part of this dissertation presents the first-ever ATLAS search for the associated production of a single top quark and a photon. This analysis is performed with 139 fb−1 of pp collision data collected by the ATLAS detector at the LHC at [square root symbol] s = 13 TeV. Only final states with exactly one lepton and at least one photon are considered in this analysis. In the second part, results from the combination of ATLAS searches for flavor changing neutral currents (FCNC) in t->Hq decays are presented. Four FCNC analyses, probing different Higgs decay modes, performed with 36.1 fb−1 of proton-proton collision data collected by the ATLAS detector in 2015-2016 are considered in the combination. They search for top-quark pair events in which one top quark decays into Wb and the other top quark decay into Hq
Search For Higgs Boson Production In Association With A Top Quark Pair In The Boosted Regime With The Cms Experiment
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Author : Shawn Darrell Williamson
language : en
Publisher:
Release Date : 2016
Search For Higgs Boson Production In Association With A Top Quark Pair In The Boosted Regime With The Cms Experiment written by Shawn Darrell Williamson 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.
Observation Of The Associated Production Of The Higgs Boson With A Top Quark Pair With The Atlas Experiment At The Lhc
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Author : Emma Winkels
language : en
Publisher:
Release Date : 2019
Observation Of The Associated Production Of The Higgs Boson With A Top Quark Pair With The Atlas Experiment At The Lhc written by Emma Winkels and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with categories.
Search For The Production Of A Higgs Boson Decaying Into A Pair Of Bottom Quarks In Association With A Pair Of Top Quarks At 13 Tev With The Atlas Detector
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Author : Filip Nechansky
language : en
Publisher:
Release Date : 2021*
Search For The Production Of A Higgs Boson Decaying Into A Pair Of Bottom Quarks In Association With A Pair Of Top Quarks At 13 Tev With The Atlas Detector written by Filip Nechansky and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021* with categories.