Search For Resonant Wz Production In The Fully Leptonic Final State At 13 Tev With The Cms Detector
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| Author | : Andres M. Vargas Hernandez |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2023 |
| Genre | : CMS. |
| ISBN | : |
A search for an electrically charged, narrow-width diboson (WZ) resonance in the fully leptonic final state using 137.65 fb^-1 of data collected by the CMS experiment during the 2016-2018 run period, at the LHC and a center of mass energy of13 TeV is presented. The search focuses on a channel where the resonance decays to a pair of standard model vector bosons: W and Z. The Z boson subsequently decays to a pair of leptons, either electrons (e) or muons (Îơ). While the W boson decays to a lepton and a neutrino (Îư). As Îư escapes undetected, the neutrino is reconstructed from the missing transverse momentum of the event. The analysis is based on a bump-hunt search strategy with background estimation based on stochastically generated simulation events. No significant excess of events is observed above the expected background from the Standard Model and limits are set on the production cross-section of the diboson resonance as a function of the resonance mass at 95% confidence level. Results are interpreted in the context of the Heavy Vector Triplet (HVT) framework.
| Author | : Benjamin Freund |
| Publisher | : |
| Total Pages | : |
| Release | : 2019 |
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| Author | : Roman Kogler |
| Publisher | : Springer Nature |
| Total Pages | : 287 |
| Release | : 2021-05-10 |
| Genre | : Science |
| ISBN | : 3030728587 |
This book introduces the reader to the field of jet substructure, starting from the basic considerations for capturing decays of boosted particles in individual jets, to explaining state-of-the-art techniques. Jet substructure methods have become ubiquitous in data analyses at the LHC, with diverse applications stemming from the abundance of jets in proton-proton collisions, the presence of pileup and multiple interactions, and the need to reconstruct and identify decays of highly-Lorentz boosted particles. The last decade has seen a vast increase in our knowledge of all aspects of the field, with a proliferation of new jet substructure algorithms, calculations and measurements which are presented in this book. Recent developments and algorithms are described and put into the larger experimental context. Their usefulness and application are shown in many demonstrative examples and the phenomenological and experimental effects influencing their performance are discussed. A comprehensive overview is given of measurements and searches for new phenomena performed by the ATLAS and CMS Collaborations. This book shows the impressive versatility of jet substructure methods at the LHC.
| Author | : Roman Pasechnik |
| Publisher | : Frontiers Media SA |
| Total Pages | : 180 |
| Release | : 2020-09-03 |
| Genre | : Science |
| ISBN | : 2889639908 |
This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
| Author | : |
| Publisher | : |
| Total Pages | : 21 |
| Release | : 2014 |
| Genre | : |
| ISBN | : |
A search for resonant WZ production in the l?l'l' (l,l'=e,?) decay channel using 20.3 fb-1 of √s = 8 TeV pp collision data collected by the ATLAS experiment at LHC is presented. No significant deviation from the Standard Model prediction is observed and upper limits on the production cross sections of WZ resonances from an extended gauge model W' and from a simplified model of heavy vector triplets are derived. As a result, a corresponding observed (expected) lower mass limit of 1.52 (1.49) TeV is derived for the W' at the 95% confidence level.
| Author | : |
| Publisher | : |
| Total Pages | : 196 |
| Release | : 2008 |
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In the first part of this work, we present a search for WW and WZ production in charged lepton, neutrino plus jets final states produced in p{bar p} collisions with √s = 1.96 TeV at the Fermilab Tevatron, using 1.2 fb−1 of data accumulated with the CDF II detector. This channel is yet to be observed in hadron colliders due to the large singleWplus jets background. However, this decay mode has a much larger branching fraction than the cleaner fully leptonic mode making it more sensitive to anomalous triple gauge couplings that manifest themselves at higher transverse W momentum. Because the final state is topologically similar to associated production of a Higgs boson with a W, the techniques developed in this analysis are also applicable in that search. An Artificial Neural Network has been used for the event selection optimization. The theoretical prediction for the cross section is [sigma]{sub WW/WZ}{sup theory} x Br(W → l[nu]; W/Z → jj) = 2.09 ± 0.14 pb. They measured N{sub Signal} = 410 ± 212(stat) ± 102(sys) signal events that correspond to a cross section [sigma]{sub WW/WZ} x Br(W → l[nu]; W/Z → jj) = 1.47 ± 0.77(stat) ± 0.38(sys) pb. The 95% CL upper limit to the cross section is estimated to be [sigma] x Br(W → l[nu]; W/Z → jj)
| Author | : |
| Publisher | : |
| Total Pages | : 179 |
| Release | : 2010 |
| Genre | : |
| ISBN | : |
In this Dissertation I present a detailed study of p{bar p} --> WZ production using fully leptonic decays of W and Z bosons with electrons and muons in the final state. Data used for the study were collected by the D0 detector at the Fermilab p{bar p} collider with a center-of-mass energy of (square root)s = 1.96 TeV and correspond to 4.1 fb−1 of integrated luminosity. The most precise measurement of the WZ production cross section is obtained and found to be in a good agreement with the standard model prediction. I also present a search for new phenomena in the WZ production by investigating the coupling between W and Z bosons and by searching for new charged particles that can decay into WZ boson pair. No evidence for new physics is found, and the most stringent limits are set on the anomalous WWZ coupling parameters and masses of charged resonances. This result also sets the stringest limit on one of the possible sources of electroweak symmetry breaking, a low-scale Technicolor with a typical heavy techni-pion hypothesis.
| Author | : Ketino Kaadze |
| Publisher | : |
| Total Pages | : |
| Release | : 2010 |
| Genre | : |
| ISBN | : |
In this Dissertation I present a detailed study of ppbar->WZ production using fully leptonic decays of W and Z bosons with electrons and muons in the final state. Data used for the study were collected by the D0 detector at the Fermilab proton-antiproton collider with a center-of-mass energy of 1.96 TeV and correspond to 4.1 fb[surepscript]-1 of integrated luminosity. The most precise measurement of the WZ production cross section is obtained and found to be in a good agreement with the standard model prediction. I also present a search for new phenomena in the WZ production by investigating the coupling between W and Z bosons and by searching for new charged particles that can decay into WZ boson pair. No evidence for new physics is found, and the most stringent limits are set on the anomalous WWZ coupling parameters and masses of charged resonances. This result also sets the stringest limit on one of the possible sources of electroweak symmetry breaking, a low-scale Technicolor with a typical heavy techni-pion hypothesis.
| Author | : Nils-Arne Rosien |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2017 |
| Genre | : |
| ISBN | : |
A measurement of the production cross section for a top quark pair in association with a Z boson (ttZ) is presented in this PhD thesis. Final states with exactly three charged leptons (electrons or muons) are used, taking into account the decay of the top quark pair in the lepton+jets channel and the decay of the Z boson into two charged leptons. The dataset used for this analysis corresponds to 36.1 fb^-1 of proton-proton collisions at a centre-of-mass energy of 13 TeV, recorded during 2015 and 2016 by the ATLAS detector at the Large Hadron Collider. The result of a profile likelihood fit ...
| Author | : Simone Marzani |
| Publisher | : Springer |
| Total Pages | : 205 |
| Release | : 2019-05-11 |
| Genre | : Science |
| ISBN | : 3030157091 |
This concise primer reviews the latest developments in the field of jets. Jets are collinear sprays of hadrons produced in very high-energy collisions, e.g. at the LHC or at a future hadron collider. They are essential to and ubiquitous in experimental analyses, making their study crucial. At present LHC energies and beyond, massive particles around the electroweak scale are frequently produced with transverse momenta that are much larger than their mass, i.e., boosted. The decay products of such boosted massive objects tend to occupy only a relatively small and confined area of the detector and are observed as a single jet. Jets hence arise from many different sources and it is important to be able to distinguish the rare events with boosted resonances from the large backgrounds originating from Quantum Chromodynamics (QCD). This requires familiarity with the internal properties of jets, such as their different radiation patterns, a field broadly known as jet substructure. This set of notes begins by providing a phenomenological motivation, explaining why the study of jets and their substructure is of particular importance for the current and future program of the LHC, followed by a brief but insightful introduction to QCD and to hadron-collider phenomenology. The next section introduces jets as complex objects constructed from a sequential recombination algorithm. In this context some experimental aspects are also reviewed. Since jet substructure calculations are multi-scale problems that call for all-order treatments (resummations), the bases of such calculations are discussed for simple jet quantities. With these QCD and jet physics ingredients in hand, readers can then dig into jet substructure itself. Accordingly, these notes first highlight the main concepts behind substructure techniques and introduce a list of the main jet substructure tools that have been used over the past decade. Analytic calculations are then provided for several families of tools, the goal being to identify their key characteristics. In closing, the book provides an overview of LHC searches and measurements where jet substructure techniques are used, reviews the main take-home messages, and outlines future perspectives.
