42 research outputs found
2nd and 3rd generation couplings with 13 TeV data 15'
No full textThe data taken at and 8\TeV at the LHC significantly constrain many couplings of the newly discovered Higgs-like boson. Up to now all observations are within uncertainties in agreement with the expectations from a Standard Model Higgs boson. Within the Standard Model (SM) this Higgs boson of the measured mass is expected to decay predominantly into a pair of bottom and anti-bottom quarks. However, this decay has not been observed yet, neither its expected coupling to 2nd (and 1st) generation fermions. Presented are the latest results of the ATLAS and CMS collaborations using 13\TeV data with regards to Higgs boson couplings to 2nd and 3rd generation fermions
Toward the discovery of 3rd generation couplings with 13 TeV data
No full textRecent results toward the discovery of 3rd generation fermion couplings to the Higgs boson will be presented. The presentation focuses on 13 TeV data taken at the LHC by ATLAS and CMS in 2016
Track and vertex reconstruction performance of the ATLAS detector
No full textDuring the third data taking period, the Large Hadron Collider provided record-breaking integrated and instantaneous luminosities, resulting in huge amounts of data being provided with numbers of interaction per bunch crossing significantly beyond initial projections. In spite of these challenging conditions, the ATLAS Inner Detector (ID) track reconstruction continued to perform excellently. In this contribution the algorithms used to reconstruct charged particles and primary vertices will be described. The software configuration used for the Run 3 data-taking period and its performance will be presented using data and simulated events. Additional track reconstruction passes, developed to improve the tracking capabilities in dedicated physics scenarios, will be discussed as well
ATLAS and CMS Run-1 results on Higgs and Standard model physics and first 13 TeV measurements with ATLAS
No full textThe wealth of data collected during the LHC Run-1 allowed many SM parameters to be measured and, most notably, lead to the discovery of the Higgs boson. This talk will summarise the most important ATLAS and CMS Run-1 results concerning the SM, including measurements of the properties of the discovered Higgs boson, assumed to be the predicted SM particle. The second part of the talk will focus on ATLAS, and present the improvements of the detector and its performance following the LS1 shutdown. The talk will finish with the first ATLAS Run-2 results at sqrt(s)=13TeV
Realism in Pain: Literary and Social Constructions of Victorian Pain in the Age of Anaesthesia, 1846-1870
No full textIn 1846 and 1847, ether and chloroform were used and celebrated for the first time in Britain and the United States as effective surgical anaesthetics capable of rendering individuals insensible to physical pain. During the same decade, British novels of realism were enjoying increasing cultural authority, dominating readers' attention, and evoking readers' sympathy for numerous social justice issues. This dissertation investigates a previously unanswered question in studies of literature and medicine: how did writers of social realism incorporate realistic descriptions of physical pain, a notoriously difficult sensation to describe, in an era when the very idea of pain's inevitability was challenged by medical developments and when, concurrently, novelists, journalists, and politicians were concerned with humanitarian reforms to recognize traditionally ignored and disadvantaged individuals and groups in pain? By contextualizing the emergence of specific realist novels including works by Elizabeth Gaskell, Charles Reade, William Howard Russell, and Charles Dickens, within larger nonfiction discourses regarding factory reform, prison reform, and war, this dissertation identifies and clarifies how realist authors, who aim to demonstrate general truths about "real life," employed various descriptions of physical pain during this watershed moment in medicine and pain theory, to convince readers of their validity as well as to awaken sympathetic politics among readers. This study analyzes Gaskell's first industrial novel, Mary Barton (1848), Reade's prison-scandal novel, It is Never Too Late to Mend (1856), Russell's Crimean War correspondence (1850s) and only novel, The Adventures of Doctor Brady (1868), and Dickens's second Bildungsroman, Great Expectations (1861), thereby revealing different strategies utilized by each author representing pain - ranging from subtle to graphic, collective to individualized, urgent to remembered, and destructive to productive. This study shows how audience expectations, political timing, authorial authority, and medical theory influence and are influenced by realist authors writing pain, as they contribute to a cultural consensus that the pain of others is unacceptable and requires attention. These realist authors must, in the end, provide fictionalized accounts of pain, asking readers to act as witnesses and to use their imaginations, in order to inspire sympathy.Englis
Modernising ATLAS Software Build Infrastructure
No full textIn the last year ATLAS has radically updated its software development infrastructure hugely reducing the complexity of building releases and greatly improving build speed, flexibility and code testing. The first step in this transition was the adoption of CMake as the software build system over the older CMT. This required the development of an automated translation from the old system to the new, followed by extensive testing and improvements. This resulted in a far more standard build process that was married to the method of building ATLAS software as a series of 12 separate projects from SVN. We then proceeded with a migration of its code base from SVN to git. As the SVN repository had been structured to manage each package more or less independently there was no simple mapping that could be used to manage the migration into git. Instead a specialist set of scripts that captured the software changes across official software releases was developed. With some clean up of the repository and the policy of only migrating packages in production releases, we managed to reduce the repository size from 62GB to 220MB. After moving to git we took the opportunity to introduce continuous integration so that now each code change from developers is built and tested before being approved. With both CMake and git in place we also dramatically simplified the build management of ATLAS software. Many heavyweight homegrown tools were dropped and the build procedure was reduced to a single bootstrap of some external packages, followed by a full build of the rest of the stack. This has reduced the time for a build by a factor of 2. It is now easy to build ATLAS software, freeing developers to test compile intrusive changes or new platform ports with ease. We have also developed a system to build lightweight ATLAS releases, for simulation, analysis or physics derivations which can be built from the same branch
Measurement of the production cross-section of a single top quark in association with a Z boson in proton-proton collisions at 13 TeV with the ATLAS detector
No full textThe production of a top quark in association with a Z boson is investigated. The proton-proton collision data collected by the ATLAS experiment at the LHC in 2015 and 2016 at a centre-of-mass energy of root s = 13 TeV are used, corresponding to an integrated luminosity of 36.1 fb(-1). Events containing three identified leptons (electrons and/or muons) and two jets, one of which is identified as a b-quark jet are selected. The major backgrounds are diboson, tt($)over-bar and Z + jets production. A neural network is used to improve the background rejection and extract the signal. The resulting significance is 4.2 sigma in the data and the expected significance is 5.4 sigma. The measured cross-section for tZq production is 600 +/- 170(stat.)+/- 140(syst.)fb. (C) 2018 The Author(s). Published by Elsevier B.V
Search for single production of a vector-like quark via a heavy gluon in the 4b final state with the ATLAS detector in pp collisions at root s=8 TeV
No full textA search is performed for the process pp -> G* -> B-H(b) over bar/(B) over bar (H)b -> Hb (b) over bar -> b (b) over barb (b) over bar, predicted in composite Higgs scenarios, where G* is a heavy colour octet vector resonance and B-H a vector-like quark of charge -1/3. The data were obtained from pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.5 fb(-1), recorded by the ATLAS detector at the LHC. The largest background, multijet production, is estimated using a data-driven method. No significant excess of events with respect to Standard Model predictions is observed, and upper limits on the production cross section times branching ratio are set. Comparisons to the predictions from a specific benchmark model are made, resulting in lower mass limits in the two-dimensional mass plane of m(G*) vs. m(BH). (c) 2016 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license
