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Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass

2016-06-15 Science
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Release : 2016-06-15
Genre : Science
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Book Synopsis Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass by : Jan Kieseler

Download or read book Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass written by Jan Kieseler. This book was released on 2016-06-15. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents the first experimental calibration of the top-quark Monte-Carlo mass. It also provides the top-quark mass-independent and most precise top-quark pair production cross-section measurement to date. The most precise measurements of the top-quark mass obtain the top-quark mass parameter (Monte-Carlo mass) used in simulations, which are partially based on heuristic models. Its interpretation in terms of mass parameters used in theoretical calculations, e.g. a running or a pole mass, has been a long-standing open problem with far-reaching implications beyond particle physics, even affecting conclusions on the stability of the vacuum state of our universe. In this thesis, this problem is solved experimentally in three steps using data obtained with the compact muon solenoid (CMS) detector. The most precise top-quark pair production cross-section measurements to date are performed. The Monte-Carlo mass is determined and a new method for extracting the top-quark mass from theoretical calculations is presented. Lastly, the top-quark production cross-sections are obtained – for the first time – without residual dependence on the top-quark mass, are interpreted using theoretical calculations to determine the top-quark running- and pole mass with unprecedented precision, and are fully consistently compared with the simultaneously obtained top-quark Monte-Carlo mass.

Measurement of Top-quark Pair Production Cross Sections and Calibration of the Top-quark Monte-Carlo Mass Using LHC Run I Proton-proton Collision Data at √s

2015
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Release : 2015
Genre :
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Book Synopsis Measurement of Top-quark Pair Production Cross Sections and Calibration of the Top-quark Monte-Carlo Mass Using LHC Run I Proton-proton Collision Data at √s by : Jan Kieseler

Download or read book Measurement of Top-quark Pair Production Cross Sections and Calibration of the Top-quark Monte-Carlo Mass Using LHC Run I Proton-proton Collision Data at √s written by Jan Kieseler. This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt:

Top Quark Pair Production

2013-10-04 Science
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Release : 2013-10-04
Genre : Science
Kind : eBook
Book Rating : 870/5 ( reviews)

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Book Synopsis Top Quark Pair Production by : Anna Christine Henrichs

Download or read book Top Quark Pair Production written by Anna Christine Henrichs. This book was released on 2013-10-04. 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.

Measurement of the Top Quark Pair Production Cross Section in Proton-proton Collisions at $\sqrt{s}

2015
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Release : 2015
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Book Synopsis Measurement of the Top Quark Pair Production Cross Section in Proton-proton Collisions at $\sqrt{s} by :

Download or read book Measurement of the Top Quark Pair Production Cross Section in Proton-proton Collisions at $\sqrt{s} written by . This book was released on 2015. Available in PDF, EPUB and Kindle. Book excerpt: The top quark pair production cross section is measured for the first time in proton-proton collisions at √s= 13 TeV by theCMS experiment at the CERN LHC, using data corresponding to an integrated luminosity of 42 pb-1. The measurement is performed by analyzing events with at least one electron and one muon of opposite charge, and at least two jets. We then measured the cross section and found that was 769 ± 60 (stat) ± 55 (syst) ± 92 (lumi) pb, in agreement with the expectation from the standard model.

First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrt{s}

2011
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Release : 2011
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Book Synopsis First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrt{s} by :

Download or read book First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrt{s} written by . This book was released on 2011. Available in PDF, EPUB and Kindle. Book excerpt: The first measurement of the cross section for top-quark pair production in pp collisions at the LHC at center-of-mass energy sqrt(s)= 7 TeV has been performed using 3.1 {\pm} 0.3 inverse pb of data recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from Drell-Yan and non-W/Z boson production are estimated from data. Eleven events are observed in the data with 2.1 {\pm} 1.0 events expected from background. The measured cross section is 194 {\pm} 72 (stat.) {\pm} 24 (syst.) {\pm} 21 (lumi.) pb, consistent with next-to-leading order predictions.

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