Cross Section Measurements Of Top Quark Pair Production In Association With A Hard Photon At 13 Tev With The Atlas Detector PDF Download
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Author | : Knut Zoch |
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Total Pages | : 0 |
Release | : 2020 |
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Download Cross-section Measurements of Top-quark Pair Production in Association with a Hard Photon at 13 TeV with the ATLAS Detector Book in PDF, ePub and Kindle
25 years after the top quark's discovery, the Large Hadron Collider at CERN produces proton-proton collision data on unprecedented scales at unprecedented energies - and has heralded an era of top-quark precision measurements. The production of a top-quark pair in association with a photon ($t bar{t} gamma$) gives access to the electromagnetic top-photon coupling, one of the fundamental properties of the top quark. Various extensions of the Standard Model predict modifications of the coupling strength or structure, and deviations from the Standard Model prediction of the $t bar{t} gamma$ pr...
Author | : Anna Christine Henrichs |
Publisher | : Springer Science & Business Media |
Total Pages | : 231 |
Release | : 2013-10-04 |
Genre | : Science |
ISBN | : 3319014870 |
Download Top Quark Pair Production Book in PDF, ePub and Kindle
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.
Author | : Joshua Wyatt Smith |
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Release | : 2018 |
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Download Fiducial Cross-section Measurements of the Production of a Prompt Photon in Association with a Top-quark Pair at √s Book in PDF, ePub and Kindle
The cross sections for top-quark pair production in association with a photon are measured in a fiducial volume with the ATLAS detector at a centre-of-mass energy of 13 TeV. Results are presented using proton-proton collision data collected by the LHC during 2015 and 2016, amounting to a total of 36.1 fb$^{-1}$. This also presents the first $t\bar{t}\gamma$ cross-section measurements performed in the dilepton channels. Exactly one photon is required to have $p_{\text{T}} > 20$ GeV and be isolated based on track and calorimeter information. At least two (four) jets are required in the dilept...
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Release | : 2015 |
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Download Observation of Top-quark Pair Production in Association with a Photon and Measurement of the Tt{u00AF}? Production Cross Section in pp Collisions at {u221A}s Book in PDF, ePub and Kindle
A search is performed for top-quark pairs (tt¯) produced together with a photon (?) with transverse energy greater than 20 GeV using a sample of tt¯ candidate events in final states with jets, missing transverse momentum, and one isolated electron or muon. The data set used corresponds to an integrated luminosity of 4.59 fb−1 of proton-proton collisions at a center-of-mass energy of 7 TeV recorded by the ATLAS detector at the CERN Large Hadron Collider. In total, 140 and 222 tt¯? candidate events are observed in the electron and muon channels, to be compared to the expectation of 79 ± 26 and 120 ± 39 non-tt¯? background events, respectively. The production of tt¯? events is observed with a significance of 5.3 standard deviations away from the null hypothesis. The tt¯? production cross section times the branching ratio (BR) of the single-lepton decay channel is measured in a fiducial kinematic region within the ATLAS acceptance. The measured value is ?fidtt¯? × BR = 63 ± 8(stat)+17–13(syst) ± 1(lumi) fb per lepton flavor, in good agreement with the leading-order theoretical calculation normalized to the next-to-leading-order theoretical prediction of 48 ± 10 fb.
Author | : Jan Kieseler |
Publisher | : Springer |
Total Pages | : 172 |
Release | : 2016-06-15 |
Genre | : Science |
ISBN | : 3319400053 |
Download Top-Quark Pair Production Cross Sections and Calibration of the Top-Quark Monte-Carlo Mass Book in PDF, ePub and Kindle
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.
Author | : [Study Group] ATLAS Collaboration CERN |
Publisher | : |
Total Pages | : 0 |
Release | : 2022 |
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Download 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 Book in PDF, ePub and Kindle
Author | : Florian Christoph Maria Fischer |
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Total Pages | : |
Release | : 2020 |
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Download Measurement of the Production Cross Section of a Top-antitop Quark Pair in Association with a Z Boson at Root from S Equals 13 TeV with the ATLAS Detector Book in PDF, ePub and Kindle
Author | : Universitat de València. Facultat de Física |
Publisher | : |
Total Pages | : 184 |
Release | : 2014 |
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Download Measurement of the Top Quark Pair Production Cross Section in Proton-proton Collisions at Center -o-mass-energies of 7 TeV in Final States with a [tau] Lepton with the ATLAS Detector Book in PDF, ePub and Kindle
Author | : Babak Abi |
Publisher | : |
Total Pages | : 154 |
Release | : 2012 |
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Download Measurement of the Top Quark Pair Production Cross Section with ATLAS Detector Book in PDF, ePub and Kindle
Author | : Bin Guo |
Publisher | : |
Total Pages | : 234 |
Release | : 2011 |
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ISBN | : 9780494782064 |
Download Measurement of the Top Quark Pair Production Cross Section and an In-situ B-tagging Efficiency Calibration with ATLAS in Proton-proton Collisions at Center of Mass Energy Book in PDF, ePub and Kindle
We present a measurement of the top anti-top quark (tt ̄ ) production cross section in the dilepton final states from proton-proton collisions at a center of mass energy at 7 TeV at the LHC. A b-tagging algorithm based on tracks displaced from the event interaction vertex is applied to identify bottom quark jets from top quark decay and reject background events. Given the relatively pure sample of bottom quark jets in tt ̄ dilepton final states, a new technique to measure in-situ the b-tagging efficiency is introduced that uses the distribution of the number of observed b-tagged jets. We present results with data collected at the ATLAS detector in 2010 with an integrated luminosity of 35 pb -1. The measured tt ̄ cross section is 176+22-21stat. +20-20 (syst.) +/- 6 (lum.) pb in the dilepton channel. We will also discuss the future prospects of this measurement.