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Search For The Standard Model Higgs Boson Produced In Association With Top Quarks In The Fully Hadronic Final State At The Cms Experiment
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Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Fully Hadronic Final State at the CMS Experiment by : Daniel N. Salerno
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Fully Hadronic Final State at the CMS Experiment written by Daniel N. Salerno and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Higgs Boson Produced With Top Quarks in Fully Hadronic Signatures by : Daniel Salerno
Download or read book The Higgs Boson Produced With Top Quarks in Fully Hadronic Signatures written by Daniel Salerno and published by Springer Nature. This book was released on 2019-10-25 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this PhD dissertation is the first search at CMS for Higgs bosons produced in association with top quarks (ttH) in a final state consisting of only jets. The results presented in this book uncover a new class of ttH events that will help us elucidate our understanding of the Yukawa sector interactions between the Higgs boson and the top quark. Despite this being the most common decay signature for ttH, a large contamination of SM backgrounds makes it the most challenging for extracting a signal from data. The PhD thesis presents many sophisticated tools and techniques that were developed in order to overcome these challenges. These tools pave the way for future analyses to investigate other standard model and beyond-standard model physics.
Book Synopsis Search for the Standard Higgs Boson Produced in Association with a Pair of Top Quark in the Multi-leptons Channel in the CMS Experiment by : Xavier Coubez
Download or read book Search for the Standard Higgs Boson Produced in Association with a Pair of Top Quark in the Multi-leptons Channel in the CMS Experiment written by Xavier Coubez and published by . This book was released on 2017 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the last elementary particle predicted by the Standard Model, the Higgs boson, has opened a new era in particle physics. One of the objectives now is to probe the coupling of the Higgs boson to other particles in order to confirm the validity of the model. The work of this thesis focused initially on the identification of jets coming from b quark at trigger level. The goal is to allow for the selection of one thousand events among the forty million produced every second at the LHC, by identifiying objects present in the final states of interesting physics processes such as the associated production of a Higgs boson decaying in a pair of b quark with a Z boson decaying into undetected neutrinos. The work then moved to the study of the coupling of the Higgs boson to the quark top, most massive particle in the Standard Model. After a study of one of the important background of the associated production of the Higgs boson and a top quark pair, a new method called matrix element method has been used to improve the discrimination between signal and background. This analysis has led to the first experimental evidence of coupling between the Higgs boson and the top quark.
Book Synopsis Search for a Standard Model Higgs Boson Produced in Association with a Top-quark Pair and Decaying to Bottom Quarks Using a Matrix Element Method by :
Download or read book Search for a Standard Model Higgs Boson Produced in Association with a Top-quark Pair and Decaying to Bottom Quarks Using a Matrix Element Method written by and published by . This book was released on 2015 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton + Jets Channel at CMS by : Geoffrey N. Smith
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton + Jets Channel at CMS written by Geoffrey N. Smith and published by . This book was released on 2014 with total page 140 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton Plus Jets Channel by : Sean C. Flowers
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks in the Lepton Plus Jets Channel written by Sean C. Flowers and published by . This book was released on 2017 with total page 109 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results for the search of a Higgs boson decaying to a bottom quark-antiquark pair produced with a top quark-antiquark pair (t ̄tH) in the lepton plus jets channel in proton-proton collisions at a center-of-mass energy of √ s = 13 TeV are presented. The data used corresponds to an integrated luminosity of 12.9 fb−1 recorded with the CMS experiment in 2016. To increase the sensitivity of the search, selected events are categorized by number of jets and number of b-tagged jets resulting in different expected signal and background rates. For each category two multivariate techniques are combined to separate the signal and background events. A machine learning process called a boosted decision tree (BDT) is trained on the two types of classes of events and then split into high and low purity based on the output. The physics motivated matrix element method (MEM) is applied to the BDT output to obtain the final two dimensional discriminator. The result is presented in terms of the t ̄tH signal strength modifier μ, the ratio of the observed t ̄tH production cross section relative to the expected cross section based on a 125 GeV Standard Model Higgs boson. A combined fit of the final discriminant in all categories of the lepton plus jets channel results an observed (expected) upper limit of μ
Book Synopsis Search for the Higgs Boson in the All-Hadronic Final State Using the CDF II Detector by :
Download or read book Search for the Higgs Boson in the All-Hadronic Final State Using the CDF II Detector written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis reports the result of a search for the Standard Model Higgs boson in events containing four reconstructed jets associated with quarks. For masses below 135 GeV/c2, the Higgs boson decays to bottom-antibottom quark pairs are dominant and result primarily in two hadronic jets. An additional two jets can be produced in the hadronic decay of a W or Z boson produced in association with the Higgs boson, or from the incoming quarks that produced the Higgs boson through the vector boson fusion process. The search is performed using a sample of s = sqrt(1.96) TeV proton-antiproton collisions corresponding to an integrated luminosity of 9.45 fb-1 recorded by the CDF II detector. The data are in agreement with the background model and 95% credibility level upper limits on Higgs boson production are set as a function of the Higgs boson mass. The median expected (observed) limit for a 125 GeV/c2 Higgs boson is 11.0 (9.0) times the predicted standard model rate.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with a Standard W Or a Z Boson and Decaying to Bottom Quarks by :
Download or read book Search for the Standard Model Higgs Boson Produced in Association with a Standard W Or a Z Boson and Decaying to Bottom Quarks written by and published by . This book was released on 2014 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson (H) decaying to b b-bar when produced in association with a weak vector boson (V) is reported for the following channels: W(mu nu)H, W(e nu)H, W(tau nu)H, Z(mu mu)H, Z(e e)H, and Z(nu nu)H. The search is performed in data samples corresponding to integrated luminosities of up to 5.1 inverse femtobarns at sqrt(s) = 7 TeV and up to 18.9 inverse femtobarns at sqrt(s) = 8 TeV, recorded by the CMS experiment at the LHC. An excess of events is observed above the expected background with a local significance of 2.1 standard deviations for a Higgs boson mass of 125 GeV, consistent with the expectation from the production of the standard model Higgs boson. The signal strength corresponding to this excess, relative to that of the standard model Higgs boson, is 1.0 +/- 0.5./abstract
Book Synopsis Search for the Standard Model Higgs Boson Produced Via Vector Boson Fusion and Decaying to Bottom Quarks with the CMS Detector at the Large Hadron Collider by : Sara Alderweireldt
Download or read book Search for the Standard Model Higgs Boson Produced Via Vector Boson Fusion and Decaying to Bottom Quarks with the CMS Detector at the Large Hadron Collider written by Sara Alderweireldt and published by . This book was released on 2016 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Standard Theory of Particle Physics by : Luciano Maiani
Download or read book The Standard Theory of Particle Physics written by Luciano Maiani and published by World Scientific Publishing Company. This book was released on 2016-08-25 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a quite complete and up-to-date picture of the Standard Theory with an historical perspective, with a collection of articles written by some of the protagonists of present particle physics. The theoretical developments are described together with the most up-to-date experimental tests, including the discovery of the Higgs Boson and the measurement of its mass as well as the most precise measurements of the top mass, giving the reader a complete description of our present understanding of particle physics.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with a Z Boson in the Electron-muon Final State and the Higgs Boson Decaying Into Bottom Quarks by : Rachel A. Bartek
Download or read book Search for the Standard Model Higgs Boson Produced in Association with a Z Boson in the Electron-muon Final State and the Higgs Boson Decaying Into Bottom Quarks written by Rachel A. Bartek and published by . This book was released on 2013 with total page 145 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson is presented in the associated production channel Z ([Pi]) H (bb ) where each tau decays leptonically, one to an electron, the other to a muon and associated neutrinos. A data sample comprising of 5.0 fb[superscript -1] and 19.0 fb[superscript -1] from the 2011 and 2012 proton collision running periods at a center of mass of 7 and 8TeV, respectively, has been analyzed and 95% C.L. upper limits derived for Higgs masses of 110-135 GeV. vi
Book Synopsis Particle Physics Reference Library by : Herwig Schopper
Download or read book Particle Physics Reference Library written by Herwig Schopper and published by Springer Nature. This book was released on 2020 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: This first open access volume of the handbook series contains articles on the standard model of particle physics, both from the theoretical and experimental perspective. It also covers related topics, such as heavy-ion physics, neutrino physics and searches for new physics beyond the standard model. A joint CERN-Springer initiative, the "Particle Physics Reference Library" provides revised and updated contributions based on previously published material in the well-known Landolt-Boernstein series on particle physics, accelerators and detectors (volumes 21A, B1,B2,C), which took stock of the field approximately one decade ago. Central to this new initiative is publication under full open access
Book Synopsis A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks by : Jonathan S. Wilson
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quarks written by Jonathan S. Wilson and published by . This book was released on 2012 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: We have performed a search for the Standard Model Higgs boson produced in association with top quarks in the lepton plus jets channel. We impose no constraints on the decay of the Higgs boson. We employ ensembles of neural networks to discriminate events containing a Higgs boson from the dominant di-top background, and set upper bounds on the Higgs production cross section. At a Higgs boson mass mH = 120 GeV/c2, we expect to exclude a cross section 12.7 times the Standard Model prediction, and we observe an exclusion 27.4 times the Standard Model prediction with 95% confidence.
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks by :
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for the Standard Model Higgs Boson Produced in Association with Top Quark Pairs in the Leptons + Jets Final State at CDF II by : Jake Connors
Download or read book A Search for the Standard Model Higgs Boson Produced in Association with Top Quark Pairs in the Leptons + Jets Final State at CDF II written by Jake Connors and published by . This book was released on 2011 with total page 84 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: In nature we have observed that the weak force is inherently short ranged, and thus must be mediated via heavy gauge bosons. Explicitly adding mass terms for these particles to the Standard Model Lagrangian, however, breaks the gauge symmetry upon which the theory is constructed. In 1964, the so-called "Higgs Mechanism" was independently proposed by Robert Brout, Francois Englert and Peter Higgs, which spontaneously gives rise to the masses of the gauge bosons as well as the fermions. In the Higgs mechanism, a new complex scalar $SU(2)$ doublet field is added to the SM Lagrangian which below a critical temperature acquires a vacuum expectation value through spontaneous electroweak symmetry breaking. When this field is re-expanded around its new minimum, the mediating gauge fields of the electroweak interaction are mixed to produce three heavy gauge bosons $\left(W^+, W^-, Z^0\right)$ and one massless boson, the photon. The quanta of this new field has come to be called the Higgs boson and verifying its existence remains to be one of the last important tests of the Standard Model. The mass of this new particle, however, cannot be directly calculated due to the unknown self-coupling parameter of the Higgs field. Presented within is a search for the SM Higgs boson produced in association with a top quark pair at the CDF II detector at the Tevatron in \SI{6.3}{\per\femto\barn} of data. We consider events which have 1 or more identified charged leptons, an imbalance in transverse momentum and at least 5 jets, where at least two of these jets are consistent with originating from the decay of a $B$ hadron. Using a neural network ensemble technique, we place 95\% confidence level upper limits on the $t\bar{t}H$ production cross section for several Higgs boson masses ranging from \SI{100}{\giga\eV\per c^2} to \SI{150}{\giga\eV\per c^2}. For a mass of \SI{120}{\giga\eV\per c^2} the expected limit is $16.3$ times the standard model predicted cross section.
Book Synopsis Search for Standard Model Higgs Boson Produced in Association with a Top Anti-top Quark Pair in 1.96 TeV Proton - Anti-proton Collisions by :
Download or read book Search for Standard Model Higgs Boson Produced in Association with a Top Anti-top Quark Pair in 1.96 TeV Proton - Anti-proton Collisions written by and published by . This book was released on 2006 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Standard Model Higgs Boson Produced in Association with Top Quarks and Decaying Into a B ̄ B Pair in P P Collisions at √ S by : Felix Bührer
Download or read book Search for the Standard Model Higgs Boson Produced in Association with Top Quarks and Decaying Into a B ̄ B Pair in P P Collisions at √ S written by Felix Bührer and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
