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Search For The Higgs Boson Decaying To Two Tau Leptons In Pbarp Collisions At A Center Of Mass Energy Of 196 Tev
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Book Synopsis Scalar Boson Decays to Tau Leptons by : Cécile Caillol
Download or read book Scalar Boson Decays to Tau Leptons written by Cécile Caillol and published by Springer. This book was released on 2017-11-15 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a study of the scalar sector in the standard model (SM), as well as various searches for an extended scalar sector in theories beyond the SM (BSM). The first part of the thesis details the search for an SM Higgs boson decaying to taus, and produced by gluon fusion, vector boson fusion, or associated production with a vector boson, leading to evidence for decays of the Higgs boson to taus. In turn, the second part highlights several searches for an extended scalar sector, with scalar boson decays to taus. In all of the analyses presented, at least one scalar boson decays to a pair of taus. The results draw on data collected by the Compact Muon Solenoid (CMS) detector during proton–proton collisions with a center-of-mass energy of 7 or 8 TeV.
Book Synopsis Multiparticle Production by : Rudolph C. Hwa
Download or read book Multiparticle Production written by Rudolph C. Hwa and published by World Scientific Publishing Company. This book was released on 1989 with total page 504 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Charged Higgs Bosons Decaying Into Top and Bottom Quarks with Single-lepton Final States Using Pp Collisions Collected at a Centre-of-mass Energy of 13 TeV by the ATLAS Detector by : Francesco Peri
Download or read book Search for Charged Higgs Bosons Decaying Into Top and Bottom Quarks with Single-lepton Final States Using Pp Collisions Collected at a Centre-of-mass Energy of 13 TeV by the ATLAS Detector written by Francesco Peri and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC by : Cristina Martin Perez
Download or read book Search for the Higgs Boson Produced in Association with Top Quarks with the CMS Detector at the LHC written by Cristina Martin Perez and published by Springer Nature. This book was released on 2022-02-09 with total page 291 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this work, the interaction between the Higgs boson and the top quark is studied with the proton-proton collisions at 13 TeV provided by the LHC at the CMS detector at CERN (Geneva). At the LHC, these particles are produced simultaneously via the associate production of the Higgs boson with one top quark (tH process) or two top quarks (ttH process). Compared to many other possible outcomes of the proton-proton interactions, these processes are very rare, as the top quark and the Higgs boson are the heaviest elementary particles known. Hence, identifying them constitutes a significant experimental challenge. A high particle selection efficiency in the CMS detector is therefore crucial. At the core of this selection stands the Level-1 (L1) trigger system, a system that filters collision events to retain only those with potential interest for physics analysis. The selection of hadronically decaying τ leptons, expected from the Higgs boson decays, is especially demanding due to the large background arising from the QCD interactions. The first part of this thesis presents the optimization of the L1 τ algorithm in Run 2 (2016-2018) and Run 3 (2022-2024) of the LHC. It includes the development of a novel trigger concept for the High-Luminosity LHC, foreseen to start in 2027 and to deliver 5 times the current instantaneous luminosity. To this end, sophisticated algorithms based on machine learning approaches are used, facilitated by the increasingly modern technology and powerful computation of the trigger system. The second part of the work presents the search of the tH and ttH processes with the subsequent decays of the Higgs boson to pairs of τ lepton, W bosons or Z bosons, making use of the data recorded during Run 2. The presence of multiple particles in the final state, along with the low cross section of the processes, makes the search an ideal use case for multivariant discriminants that enhance the selectivity of the signals and reject the overwhelming background contributions. The discriminants presented are built using state-of-the-art machine learning techniques, able to capture the correlations amongst the processes involved, as well as the so-called Matrix Element Method (MEM), which combines the theoretical description of the processes with the detector resolution effects. The level of sophistication of the methods used, along with the unprecedented amount of collision data analyzed, result in the most stringent measurements of the tH and ttH cross sections up to date.
Book Synopsis Heavy Neutral Particle Decays to Tau Pairs by : Michail Bachtis
Download or read book Heavy Neutral Particle Decays to Tau Pairs written by Michail Bachtis and published by Springer Science & Business Media. This book was released on 2013-12-13 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work presented in this thesis spans a wide range of experimental particle physics subjects, starting from level-1 trigger electronics to the final results of the search for Higgs boson decay and to tau lepton pairs. The thesis describes an innovative reconstruction algorithm for tau decays and details how it was instrumental in providing a measurement of Z decay to tau lepton pairs. The reliability of the analysis is fully established by this measurement before the Higgs boson decay to tau lepton pairs is considered. The work described here continues to serve as a model for analysing CMS Higgs to tau leptons measurements.
Book Synopsis The Search and Discovery of the Higgs Boson by : Luis Roberto Flores Castillo
Download or read book The Search and Discovery of the Higgs Boson written by Luis Roberto Flores Castillo and published by Morgan & Claypool Publishers. This book was released on 2016-01-01 with total page 76 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a general description of the search for and discovery of the Higgs boson (particle) at CERN’s Large Hadron Collider. The goal is to provide a relatively brief overview of the issues, instruments and techniques relevant for this search; written by a physicist who was directly involved. The Higgs boson mat be the one particle that was studied the most before its discovery and the story from postulation in 1964 to detection in 2012 is a fascinating one. The story is told here while detailing the fundamentals of particle physics.
Book Synopsis Higgs Boson Decays into a Pair of Bottom Quarks by : Cecilia Tosciri
Download or read book Higgs Boson Decays into a Pair of Bottom Quarks written by Cecilia Tosciri and published by Springer Nature. This book was released on 2021-10-22 with total page 171 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery in 2012 of the Higgs boson at the Large Hadron Collider (LHC) represents a milestone for the Standard Model (SM) of particle physics. Most of the SM Higgs production and decay rates have been measured at the LHC with increased precision. However, despite its experimental success, the SM is known to be only an effective manifestation of a more fundamental description of nature. The scientific research at the LHC is strongly focused on extending the SM by searching, directly or indirectly, for indications of New Physics. The extensive physics program requires increasingly advanced computational and algorithmic techniques. In the last decades, Machine Learning (ML) methods have made a prominent appearance in the field of particle physics, and promise to address many challenges faced by the LHC. This thesis presents the analysis that led to the observation of the SM Higgs boson decay into pairs of bottom quarks. The analysis exploits the production of a Higgs boson associated with a vector boson whose signatures enable efficient triggering and powerful background reduction. The main strategy to maximise the signal sensitivity is based on a multivariate approach. The analysis is performed on a dataset corresponding to a luminosity of 79.8/fb collected by the ATLAS experiment during Run-2 at a centre-of-mass energy of 13 TeV. An excess of events over the expected background is found with an observed (expected) significance of 4.9 (4.3) standard deviation. A combination with results from other \Hbb searches provides an observed (expected) significance of 5.4 (5.5). The corresponding ratio between the signal yield and the SM expectation is 1.01 +- 0.12 (stat.)+ 0.16-0.15(syst.). The 'observation' analysis was further extended to provide a finer interpretation of the V H(H → bb) signal measurement. The cross sections for the VH production times the H → bb branching ratio have been measured in exclusive regions of phase space. These measurements are used to search for possible deviations from the SM with an effective field theory approach, based on anomalous couplings of the Higgs boson. The results of the cross-section measurements, as well as the constraining of the operators that affect the couplings of the Higgs boson to the vector boson and the bottom quarks, have been documented and discussed in this thesis. This thesis also describes a novel technique for the fast simulation of the forward calorimeter response, based on similarity search methods. Such techniques constitute a branch of ML and include clustering and indexing methods that enable quick and efficient searches for vectors similar to each other. The new simulation approach provides optimal results in terms of detector resolution response and reduces the computational requirements of a standard particles simulation.
Book Synopsis Literacy as Numbers Teacher's Book by : Mary Hamilton
Download or read book Literacy as Numbers Teacher's Book written by Mary Hamilton and published by Cambridge University Press. This book was released on 2015-03-05 with total page 263 pages. Available in PDF, EPUB and Kindle. Book excerpt: A collaborative series with the University of Cambridge Faculty of Education highlighting leading-edge research across Teacher Education, International Education Reform and Language Education.
Book Synopsis A Beauty-ful Boson by : Giulia Di Gregorio
Download or read book A Beauty-ful Boson written by Giulia Di Gregorio and published by Springer Nature. This book was released on 2023-01-01 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Book Synopsis Culture and International Economic Law by : Valentina Vadi
Download or read book Culture and International Economic Law written by Valentina Vadi and published by Routledge. This book was released on 2015-02-11 with total page 307 pages. Available in PDF, EPUB and Kindle. Book excerpt: Globalization and international economic governance offer unprecedented opportunities for cultural exchange. Foreign direct investments can promote cultural diversity and provide the funds needed to locate, recover and preserve cultural heritage. Nonetheless, globalization and international economic governance can also jeopardize cultural diversity and determine the erosion of the cultural wealth of nations. Has an international economic culture emerged that emphasizes productivity and economic development at the expense of the common wealth? This book explores the ‘clash of cultures’ between international law and international cultural law, and asks whether States can promote economic development without infringing their cultural wealth. The book contains original chapters by experts in the field. Key issues include how international courts and tribunals are adjudicating culture–related cases; the interplay between indigenous peoples' rights and economic globalization; and the relationships between culture, human rights, and economic activities. The book will be of great interest and use to researchers and students of international trade law, cultural heritage law, and public international law.
Download or read book Catalyst written by Simon Guy and published by . This book was released on 2015-06 with total page 215 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Diasporas of the Modern Middle East by : Anthony Gorman
Download or read book Diasporas of the Modern Middle East written by Anthony Gorman and published by Edinburgh University Press. This book was released on 2015-05-29 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: Approaching the Middle East through the lens of Diaspora Studies, the 11 detailed case studies in this volume explore the experiences of different diasporic groups in and of the region, and look at the changing conceptions and practice of diaspora in the
Book Synopsis Conservatism and Ideology by : Matthew Johnson
Download or read book Conservatism and Ideology written by Matthew Johnson and published by Routledge. This book was released on 2017-10-02 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: Michael Oakshott described conservatism as a non-ideological preference for the familiar, tried, actual, limited, near, sufficient, convenient and present. Historically, conservatives have been associated with attempts to sustain social harmony between classes and groups within an organic, hierarchical order grounded in collective history and cultural values. Yet, in recent decades, conservatism throughout the English-speaking world has been associated with radical social and economic policy, often championing free-market models which substitute the free movement of labour and forms of competition and social mobility for organic hierarchy and noblesse oblige. The radical changes associated with such policies call into question the extent to which contemporary conservatism is conservative, rather than ideological. This book seeks to explore contemporary conservative political thought with regard to such topics as, ‘One Nation’ politics and Big Society, sovereignty, multiculturalism and international blocs, paternalism and negative liberty with regard to narcotics, pornography and education, regional and international development, and public faith, establishment and religious diversity. This book will be published as a special issue of Global Discourse.
Book Synopsis International Law and Post-Conflict Reconstruction Policy by : Matthew Saul
Download or read book International Law and Post-Conflict Reconstruction Policy written by Matthew Saul and published by Routledge. This book was released on 2015-05-15 with total page 355 pages. Available in PDF, EPUB and Kindle. Book excerpt: The trend for international engagement in post-conflict reconstruction has produced a host of best-practice postulates on topics such as local involvement in decision-making, accountability for past atrocities, sensitivity to context, and the construction of democratic institutions of governance. International law has potential relevance for many of these themes, yet the question of how the implementation of best-practice policy recommendations might be affected by international law remains under-examined. This book offers a fuller understanding of the role of international law in the practice of post-conflict reconstruction. It explores how international legal issues that arise in the post-conflict period relate to a number of strands of the policy debate, including government creation, constitution-making, gender policy, provision of security, justice for past atrocities, rule of law development, economic recovery, returning displaced persons, and responsibilities of international actors. The chapters of the book work to reveal the extent to which international law figures in the policy of internationally enabled post-conflict reconstruction across a range of sectors. They also highlight the scope for international law to be harnessed in a more effective manner from the perspective of the transition to peace and stability. The book lays out a basis for future policy making on post-conflict reconstruction; one that is informed about the international legal parameters, and more aware of how international law can be utilized to promote key objectives.
Book Synopsis Negotiating Spaces for Literacy Learning by : Mary Hamilton
Download or read book Negotiating Spaces for Literacy Learning written by Mary Hamilton and published by Bloomsbury Publishing. This book was released on 2015-05-21 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: Negotiating Spaces for Literacy Learning addresses two paradoxical currents that are sweeping through the contemporary educational field. The first is the opening up of possibilities for multimodal communication as a result of developments in digital technologies and the sensitivity to multiliteracies. The second is the increasing pressure from standardised testing, accountability and performance measurement which pull curricular and pedagogical practices out of alignment with the everyday informal practices and interests of teachers and learners and narrow opportunities for diverse expressions of literacy. Bringing together an international team of scholars to examine the tensions and struggles that result from the current educational climate, the book provides a much-needed discussion of the intersection of technologies of literacies, education and self. It does so through diverse approaches, including philosophical, theoretical and methodological treatments of multimodality and governmentality, and a range of literacies - early years, primary school, workplace, digital, middle school, secondary school, indigenous, adult and place. With examples taken from all stages of education and in several countries, the book allows readers to explore a range of multimodal practices and the ways in which governmentality plays out across them.
Book Synopsis Advancing Methodology and Practice by : Alison Mackey
Download or read book Advancing Methodology and Practice written by Alison Mackey and published by Routledge. This book was released on 2015-11-19 with total page 281 pages. Available in PDF, EPUB and Kindle. Book excerpt: Instruments for Research into Second Languages is an accessible introduction to understanding and evaluating existing and emerging methodologies in L2 research. The book provides an introduction to the data collection materials available in the IRIS database. IRIS is an open access, searchable repository of instruments used to elicit data for research into second and foreign language learning and teaching. The book is aimed at graduate students, researchers and educators in the fields of Applied Linguistics and Second Language Acquisition. Featuring contributions from top scholars in the field, this dynamic volume includes empirical research carried out using innovative instruments held in IRIS, offering insights into their basic mechanics, how and why they are used, as well as the challenges they can present. The chapters describe the kinds of data (evidence about knowledge, processing, interaction, learning, and motivation) that result from these methods, and they discuss conditions that lead to reliable and valid data collection and analysis. This unique collection provides researchers, professionals, and students with up-to-date responses to practical and theoretical questions about how second language learning and teaching can be investigated using the IRIS database of instruments. IRIS was funded by the Economic and Social Research Council and is a long term British Academy Research Project.
Book Synopsis Handbook of Qualitative Research Techniques and Analysis in Entrepreneurship by : Helle Neergaard
Download or read book Handbook of Qualitative Research Techniques and Analysis in Entrepreneurship written by Helle Neergaard and published by Edward Elgar Publishing. This book was released on 2015-10-30 with total page 463 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most challenging tasks in the research design process is choosing the most appropriate data collection and analysis technique. This Handbook provides a detailed introduction to five qualitative data collection and analysis techniques pertinent to exploring entrepreneurial phenomena. Techniques for collecting and analysing data are rarely addressed in detail in published articles. In addition, the constant development of new tools and refinement of existing ones has meant that researchers often face a confusing range from which to choose. The experienced and expert group of contributors to this book provide detailed, practical accounts of how to conduct research employing focus groups, critical incident technique, repertory grids, metaphors, the constant comparative method and grounded theory. This Handbook will become the starting point for any research project. Scholars new to entrepreneurship and doctoral students as well as established academics keen to extend their research scope will find this book an invaluable and timely resource.
