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Author : Stephan A. Sandvoss
Publisher :
ISBN 13 : 9783832289430
Total Pages : 162 pages
Book Rating : 4.2/5 (894 download)
Download or read book Topics in the Measurement of Top Quark Events with ATLAS written by Stephan A. Sandvoss and published by . This book was released on 2010 with total page 162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Anna Christine Henrichs
Publisher : Springer Science & Business Media
ISBN 13 : 3319014870
Total Pages : 231 pages
Book Rating : 4.3/5 (19 download)
Download or read book Top Quark Pair Production written by Anna Christine Henrichs and published by Springer Science & Business Media. This book was released on 2013-10-04 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Before any kind of new physics discovery could be made at the LHC, a precise understanding and measurement of the Standard Model of particle physics' processes was necessary. The book provides an introduction to top quark production in the context of the Standard Model and presents two such precise measurements of the production of top quark pairs in proton-proton collisions at a center-of-mass energy of 7 TeV that were observed with the ATLAS Experiment at the LHC. The presented measurements focus on events with one charged lepton, missing transverse energy and jets. Using novel and advanced analysis techniques as well as a good understanding of the detector, they constitute the most precise measurements of the quantity at that time.
Download or read book Prospects for Top Quark Mass Measurement Through the Fully Hadronic Decay of Top-antitop Events with the ATLAS Detector written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis outlines the prospects for top quark mass measurement through the Fully Hadronic decay of top-antitop events with the ATLAS detector. Methods with and without b-tagging were explored. Without b-tagging the signal was hidden beneath the QCD multi-jet background and prospects for a mass measurement do not appear to be good. A standard and a pessimistic b-tagging likelihood significance value were explored. The standard value gives a S/B of 0.88 and the more pessimistic value gives a S/B of 0.79. For 1 fb−1 a significance of 36.8 and 32.0 can be obtained for the standard and pessimistic scenarios respectively. A selection efficiency of 1.4% and 1.1% can be achieved for the standard and pessimistic values respectively. Assuming a top mass of 174 GeV, a mass peak can clearly be seen for both b-tagging values. For the standard scenario, a top mass of 168.94 GeV with a statistical error of 0.33 GeV can be extracted. With the pessimistic scenario, the extracted mass is 169.11 GeV with a statistical error of 0.36 GeV. This is the first attempt with fully simulated events and therefore there are possibilities for improvement. This analysis did not include b-jet energy scale correction.
Author : Keith Edmonds
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (858 download)
Download or read book Prospects for Top Quark Mass Measurement Through the Fully Hadronic Decay of Top-antitop Events with the ATLAS Detector written by Keith Edmonds and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis outlines the prospects for top quark mass measurement through theFully Hadronic decay of top-antitop events with the ATLAS detector. Methods withand without b-tagging were explored. Without b-tagging the signal was hidden beneaththe QCD multi-jet background and prospects for a mass measurement do notappear to be good. A standard and a pessimistic b-tagging likelihood significancevalue were explored. The standard value gives a S/B of 0.88 and the more pessimisticvalue gives a S/B of 0.79. For 1 fb?1 a significance of 36.8 and 32.0 can be obtainedfor the standard and pessimistic scenarios respectively. A selection efficiency of 1.4%and 1.1% can be achieved for the standard and pessimistic values respectively. Assuminga top mass of 174 GeV, a mass peak can clearly be seen for both b-taggingvalues. For the standard scenario, a top mass of 168.94 GeV with a statistical errorof 0.33 GeV can be extracted. With the pessimistic scenario, the extracted mass is169.11 GeV with a statistical error of 0.36 GeV. This is the first attempt with fullysimulated events and therefore there are possibilities for improvement. This analysisdid not include b-jet energy scale correction.
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Author : [Study Group] ATLAS Collaboration CERN
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (137 download)
Download or read book Measurements of Differential Cross-sections in Top-quark Pair Events with a High Transverse Momentum Top Quark and Limits on Beyond the Standard Model Contributions to Top-quark Pair Production with the ATLAS Detector at [square Root]s written by [Study Group] ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Sebastian Mergelmeyer
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (974 download)
Download or read book Measurement of the Associated Production of a Single Top Quark and a W Boson in Single-lepton Events with the ATLAS Detector written by Sebastian Mergelmeyer and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Daiki Yamaguchi
Publisher : Springer Nature
ISBN 13 : 9811509328
Total Pages : 279 pages
Book Rating : 4.8/5 (115 download)
Download or read book Search for New Phenomena in Top-Antitop Quarks Final States with Additional Heavy-Flavour Jets with the ATLAS Detector written by Daiki Yamaguchi and published by Springer Nature. This book was released on 2019-10-30 with total page 279 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book reports on the search for a new heavy particle, the Vector-Like Top quark (VLT), in the Large Hadron Collider (LHC) at CERN. The signal process is the pair production of VLT decaying into a Higgs boson and top quark (TT→Ht+X, X=Ht, Wb, Zt). The signal events result in top–antitop quarks final states with additional heavy flavour jets. The book summarises the analysis of the data collected with the ATLAS detector in 2015 and 2016. In order to better differentiate between signals and backgrounds, exclusive taggers of top quark and Higgs boson were developed and optimised for VLT signals. These efforts improved the sensitivity by roughly 30%, compared to the previous analysis. The analysis outcomes yield the strongest constraints on parameter space in various BSM theoretical models. In addition, the book addresses detector operation and the evaluation of tracking performance. These efforts are essential to properly collecting dense events and improving the accuracy of the reconstructed objects that are used for particle identification. As such, they represent a valuable contribution to data analysis in extremely dense environments.
Author : Patrick Rieck
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (962 download)
Download or read book Measurement of S-channel Single Top-quark Production with the ATLAS Detector Using Total Event Likelihoods written by Patrick Rieck and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Alexander Grohsjean
Publisher : Springer Science & Business Media
ISBN 13 : 364214070X
Total Pages : 155 pages
Book Rating : 4.6/5 (421 download)
Download or read book Measurement of the Top Quark Mass in the Dilepton Final State Using the Matrix Element Method written by Alexander Grohsjean and published by Springer Science & Business Media. This book was released on 2010-10-01 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main pacemakers of scienti?c research are curiosity, ingenuity, and a pinch of persistence. Equipped with these characteristics a young researcher will be s- cessful in pushing scienti?c discoveries. And there is still a lot to discover and to understand. In the course of understanding the origin and structure of matter it is now known that all matter is made up of six types of quarks. Each of these carry a different mass. But neither are the particular mass values understood nor is it known why elementary particles carry mass at all. One could perhaps accept some small generic mass value for every quark, but nature has decided differently. Two quarks are extremely light, three more have a somewhat typical mass value, but one quark is extremely massive. It is the top quark, the heaviest quark and even the heaviest elementary particle that we know, carrying a mass as large as the mass of three iron nuclei. Even though there exists no explanation of why different particle types carry certain masses, the internal consistency of the currently best theory—the standard model of particle physics—yields a relation between the masses of the top quark, the so-called W boson, and the yet unobserved Higgs particle. Therefore, when one assumes validity of the model, it is even possible to take precise measurements of the top quark mass to predict the mass of the Higgs (and potentially other yet unobserved) particles.
Author : Tomas Dado
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (113 download)
Download or read book Direct Measurement of the Top-quark Decay Width with the ATLAS Detector written by Tomas Dado and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark is the heaviest known elementary particle. Due to its large mass, the top quark decays before it forms bound states. This makes the top quark a unique particle in the Standard Model. Precise measurements of its properties could be used as tests of the consistency of the Standard Model and potential deviations could point to physics Beyond the Standard Model. This thesis deals with the direct measurement of the top-quark decay width using data collected in proton-proton collisions at centre-of-mass energies of 8 and 13 TeV with the ATLAS detector at the Large Hadron Collider. T...
Author : Shota Tsiskaridze
Publisher : Springer
ISBN 13 : 3319634143
Total Pages : 248 pages
Book Rating : 4.3/5 (196 download)
Download or read book Search for Flavor-Changing Neutral Current Top Quark Decays t → Hq, with H → bb̅ , in pp Collisions at √s = 8 TeV with the ATLAS Detector written by Shota Tsiskaridze and published by Springer. This book was released on 2017-08-02 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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 : Kenneth Wraight
Publisher :
ISBN 13 :
Total Pages : 189 pages
Book Rating : 4.:/5 (744 download)
Download or read book From the Sublime to the Ridiculous written by Kenneth Wraight and published by . This book was released on 2011 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Jonathan Jamieson
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (132 download)
Download or read book Aiming for the Top Corner written by Jonathan Jamieson and published by . This book was released on 2022 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Liza Mijović
Publisher :
ISBN 13 :
Total Pages : 214 pages
Book Rating : 4.:/5 (781 download)
Download or read book Top Quark Mass Measurement with the Atlas Detector written by Liza Mijović and published by . This book was released on 2010 with total page 214 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harish Potti
Publisher :
ISBN 13 :
Total Pages : 300 pages
Book Rating : 4.:/5 (123 download)
Download or read book Seeing a Single Top Quark written by Harish Potti and published by . This book was released on 2020 with total page 300 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
Download or read book Properties of the Top Quark written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent measurements of top-quark properties at the LHC and the Tevatron are presented. Most recent measurements of the top quark mass have been carried out by CMS using $19.7/$fb of $\sqrt{s} = 8$ TeV data including the study of the dependence on event kinematics. ATLAS uses the full Run I data at $\sqrt{s} = 7$ TeV for a "3D" measurement that significantly reduces systematic uncertainties. D0 employs the full Run II data using the matrix element method to measure the top quark mass with significantly reduced systematic uncertainties. Many different measurements of the top quark exist to date and the most precise ones per decay channel per experiment have been combined into the first world combination with a relative precision of 0.44%. Latest updates of measurements of production asymmetries include the measurement of the \ttbar production asymmetry by D0 employing the full Run II data set, by CMS and ATLAS (including the polarization of the top quark) employing both the full data set at $\sqrt{s} = 7$ TeV. CMS uses the full $\sqrt{s} = 8$ TeV data to measure the top quark polarization in single top production, the ratio ${\cal R}$ of the branching fractions ${\cal B}(t \rightarrow Wb) / {\cal B}(t \rightarrow Wq)$ and to search for flavor changing neutral currents. The results from all these measurements agree well with their respective Standard Model expectation.
Author : Roland Härtel
Publisher :
ISBN 13 :
Total Pages : 123 pages
Book Rating : 4.:/5 (455 download)
Download or read book Studies on an Initial Top Quark Mass Measurement at ATLAS in the Lepton+jets Tt̄ Decay Channel and Alignment of the Pixel and SCT Subdetectors written by Roland Härtel and published by . This book was released on 2009 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
