Search for New Physics with Top Quark Pairs in the L+jets Channel at Sqrt(s) PDF Download
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Author: Sabrina Groh
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Languages : en
Pages : 0
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Author: Sabrina Groh
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Languages : en
Pages : 0
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Author: Dag Gillberg
Publisher: Springer Science & Business Media
ISBN: 1441977996
Category : Science
Languages : en
Pages : 149
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The top quark is by far the heaviest known fundamental particle with a mass nearing that of a gold atom. Because of this strikingly high mass, the top quark has several unique properties and might play an important role in electroweak symmetry breaking—the mechanism that gives all elementary particles mass. Creating top quarks requires access to very high energy collisions, and at present only the Tevatron collider at Fermilab is capable of reaching these energies. Until now, top quarks have only been observed produced in pairs via the strong interaction. At hadron colliders, it should also be possible to produce single top quarks via the electroweak interaction. Studies of single top quark production provide opportunities to measure the top quark spin, how top quarks mix with other quarks, and to look for new physics beyond the standard model. Because of these interesting properties, scientists have been looking for single top quarks for more than 15 years. This thesis presents the first discovery of single top quark production. It documents one of the flagship measurements of the D0 experiment, a collaboration of more than 600 physicists from around the world. It describes first observation of a physical process known as “single top quark production”, which had been sought for more than 10 years before its eventual discovery in 2009. Further, his thesis describes, in detail, the innovative approach Dr. Gillberg took to this analysis. Through the use of Boosted Decision Trees, a machine-learning technique, he observed the tiny single top signal within an otherwise overwhelming background. This Doctoral Thesis has been accepted by Simon Fraser University, Burnaby, BC, Canada.
Author: Mathis Kolb
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Category :
Languages : en
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Author: Juan Pablo Gómez Cardona
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Category :
Languages : en
Pages :
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The data analyzed correspond to an integrated luminosity of 19.5 fb-1 of proton-proton collisions at sqrt(s) = 8 TeV, collected by the CMS experiment. The topology of the event is defined as the most likely permutation of the objects in the final state corresponding of the Feynman diagram studied. This is accomplished by maximizing likelihood function. An additional discriminant is obtained by finding the matrix elements weight of the most probable permutation by using MADWEIGHT. We define event selection criteria based on correlations of topological and kinematic variables. We show that this technique, based on the topology of the event, competes with the exclusion limits already obtained by previous analyses and has the potential to become a powerful tool for future searches. The document is organized in the following way: First, a brief introduction to the LHC and some of its operation details is given, this is followed by a description of the CMS detector and its sub-detectors. Then the Standard Model is reviewed as well as the reasons why new physics is expected. After this, a brief introduction to SUSY is given, showing the main implications that it has, and some of the solutions given by this theory to the SM limitations. Second, the last, the current status of some SUSY searches is described, their actual limits are shown, and certain strategies used by the CMS experiment to search to SUSY are described. Finally, the analysis performed by us, the results, the conclusions and the future developments are presented.
Author: Roman Anatolievich Ryutin
Publisher: World Scientific
ISBN: 9814578754
Category : Science
Languages : en
Pages : 234
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This unique volume contains the materials of the XXIXth International Workshop on High Energy Physics. The content of the volume is much wider than just high-energy physics and actually concerns all the most fundamental areas of modern physics research: high-energy physics proper, gravitation and cosmology. Presentations embrace both theory and experiment.
Author: Laurie Iain McClymont
Publisher:
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Category :
Languages : en
Pages : 0
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Author: Shota Tsiskaridze
Publisher: Springer
ISBN: 3319634143
Category : Science
Languages : en
Pages : 248
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This PhD thesis focuses on the search for flavor-changing neutral currents in the decay of a top quark to an up-type quark (q = u, c) and the Standard Model Higgs boson, where the Higgs boson decays to bb. Further, the thesis presents the combination of this search for top quark pair events with other ATLAS searches – in the course of which the most restrictive bounds to date on tqH interactions were obtained. Following on from the discovery of the Higgs boson, it is particularly important to measure the Yukawa couplings of the Standard Model fermions; these parameters may provide crucial insights to help solve the flavor puzzle and may help reveal the presence of new physics before it is directly observed in experiments.
Author:
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Category :
Languages : en
Pages : 35
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Author: Cathy Elaine Cretsinger
Publisher:
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Category :
Languages : en
Pages : 294
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Author: Laurie Iain McClymont
Publisher:
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Category :
Languages : en
Pages :
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