Institution
Brunel University London
Education•London, United Kingdom•
About: Brunel University London is a education organization based out in London, United Kingdom. It is known for research contribution in the topics: Large Hadron Collider & Population. The organization has 10918 authors who have published 29515 publications receiving 893330 citations. The organization is also known as: Brunel & University of Brunel.
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University of Hamburg1, Brunel University London2, University of Liverpool3, Fermilab4, Max Planck Society5, University of Perugia6, University of Glasgow7, Lancaster University8, Spanish National Research Council9, University of Ljubljana10, Ghent University11, King's College London12, Karlsruhe Institute of Technology13, Brookhaven National Laboratory14, STMicroelectronics15, University of California, Berkeley16, CERN17, Imperial College London18, Czech Technical University in Prague19, Université de Montréal20, National Academy of Sciences of Ukraine21, Tel Aviv University22, Kurchatov Institute23, Academy of Sciences of the Czech Republic24, SINTEF25, Royal Institute of Technology26, Micron Technology27, Charles University in Prague28, Technical University of Dortmund29
01 Jul 2001-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this paper, a defect engineering technique was employed resulting in the development of Oxygen enriched FZ silicon (DOFZ), ensuring the necessary O-enrichment of about 2×1017 O/cm3 in the normal detector processing.
Abstract: The RD48 (ROSE) collaboration has succeeded to develop radiation hard silicon detectors, capable to withstand the harsh hadron fluences in the tracking areas of LHC experiments. In order to reach this objective, a defect engineering technique was employed resulting in the development of Oxygen enriched FZ silicon (DOFZ), ensuring the necessary O-enrichment of about 2×1017 O/cm3 in the normal detector processing. Systematic investigations have been carried out on various standard and oxygenated silicon diodes with neutron, proton and pion irradiation up to a fluence of 5×1014 cm−2 (1 MeV neutron equivalent). Major focus is on the changes of the effective doping concentration (depletion voltage). Other aspects (reverse current, charge collection) are covered too and the appreciable benefits obtained with DOFZ silicon in radiation tolerance for charged hadrons are outlined. The results are reliably described by the “Hamburg model”: its application to LHC experimental conditions is shown, demonstrating the superiority of the defect engineered silicon. Microscopic aspects of damage effects are also discussed, including differences due to charged and neutral hadron irradiation.
402 citations
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TL;DR: In this paper, the authors explore the micropolitics of the research process and establish a framework for materialist social inquiry methodology and methods, and discuss the epistemological consequences of adopting a materialist ontology.
Abstract: This paper discusses issues of research design and methods in new materialist social inquiry, an approach that is attracting increasing interest across the social sciences as an alternative to either realist or constructionist ontologies. New materialism de-privileges human agency, focusing instead upon how assemblages of the animate and inanimate together produce the world, with fundamental implications for social inquiry methodology and methods. Key to our exploration is the materialist notion of a ‘research-assemblage’ comprising researcher, data, methods and contexts. We use this understanding first to explore the micropolitics of the research process, and then – along with a review of 30 recent empirical studies – to establish a framework for materialist social inquiry methodology and methods. We discuss the epistemological consequences of adopting a materialist ontology.
402 citations
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TL;DR: Patterns of beta-globin diversity suggest extensive worldwide late Pleistocene gene flow and are not easily reconciled with a unidirectional migration out of Africa 100,000 years ago and total replacement of archaic populations in Asia.
Abstract: A 3-kb region encompassing the beta-globin gene has been analyzed for allelic sequence polymorphism in nine populations from Africa, Asia, and Europe. A unique gene tree was constructed from 326 sequences of 349 in the total sample. New maximum-likelihood methods for analyzing gene trees on the basis of coalescence theory have been used. The most recent common ancestor of the beta-globin gene tree is a sequence found only in Africa and estimated to have arisen approximately 800,000 years ago. There is no evidence for an exponential expansion out of a bottlenecked founding population, and an effective population size of approximately 10,000 has been maintained. Modest differences in levels of beta-globin diversity between Africa and Asia are better explained by greater African effective population size than by greater time depth. There may have been a reduction of Asian effective population size in recent evolutionary history. Characteristically Asian ancestry is estimated to be older than 200,000 years, suggesting that the ancestral hominid population at this time was widely dispersed across Africa and Asia. Patterns of beta-globin diversity suggest extensive worldwide late Pleistocene gene flow and are not easily reconciled with a unidirectional migration out of Africa 100,000 years ago and total replacement of archaic populations in Asia.
401 citations
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Vardan Khachatryan, Albert M. Sirunyan, Armen Tumasyan, Wolfgang Adam1 +2114 more•Institutions (146)
TL;DR: In this article, the spin-parity and tensor structure of the interactions of the recently discovered Higgs boson is performed using the H to ZZ, Z gamma*, gamma* gamma* to 4 l, H to WW to l nu l nu, and H to gamma gamma decay modes.
Abstract: The study of the spin-parity and tensor structure of the interactions of the recently discovered Higgs boson is performed using the H to ZZ, Z gamma*, gamma* gamma* to 4 l, H to WW to l nu l nu, and H to gamma gamma decay modes. The full dataset recorded by the CMS experiment during the LHC Run 1 is used, corresponding to an integrated luminosity of up to 5.1 inverse femtobarns at a center-of-mass energy of 7 TeV and up to 19.7 inverse femtobarns at 8 TeV. A wide range of spin-two models is excluded at a 99% confidence level or higher, or at a 99.87% confidence level for the minimal gravity-like couplings, regardless of whether assumptions are made on the production mechanism. Any mixed-parity spin-one state is excluded in the ZZ and WW modes at a greater than 99.999% confidence level. Under the hypothesis that the resonance is a spin-zero boson, the tensor structure of the interactions of the Higgs boson with two vector bosons ZZ, Z gamma, gamma gamma, and WW is investigated and limits on eleven anomalous contributions are set. Tighter constraints on anomalous HVV interactions are obtained by combining the HZZ and HWW measurements. All observations are consistent with the expectations for the standard model Higgs boson with the quantum numbers J[PC]=0[++].
399 citations
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TL;DR: In this paper, the Hermiticity condition in quantum mechanics required for the characterization of physical observables and generators of unitary motions can be relaxed into a wider class of operators whose eigenvalues are real and whose Eigenstates are complete.
Abstract: The Hermiticity condition in quantum mechanics required for the characterization of (a) physical observables and (b) generators of unitary motions can be relaxed into a wider class of operators whose eigenvalues are real and whose eigenstates are complete. In this case, the orthogonality of eigenstates is replaced by the notion of biorthogonality that defines the relation between the Hilbert space of states and its dual space. The resulting quantum theory, which might appropriately be called 'biorthogonal quantum mechanics', is developed here in some detail in the case for which the Hilbert-space dimensionality is finite. Specifically, characterizations of probability assignment rules, observable properties, pure and mixed states, spin particles, measurements, combined systems and entanglements, perturbations, and dynamical aspects of the theory are developed. The paper concludes with a brief discussion on infinite-dimensional systems.
398 citations
Authors
Showing all 11074 results
Name | H-index | Papers | Citations |
---|---|---|---|
Yang Yang | 171 | 2644 | 153049 |
Hongfang Liu | 166 | 2356 | 156290 |
Gavin Davies | 159 | 2036 | 149835 |
Marjo-Riitta Järvelin | 156 | 923 | 100939 |
Matt J. Jarvis | 144 | 1064 | 85559 |
Alexander Belyaev | 142 | 1895 | 100796 |
Louis Lyons | 138 | 1747 | 98864 |
Silvano Tosi | 135 | 1712 | 97559 |
John A Coughlan | 135 | 1312 | 96578 |
Kenichi Hatakeyama | 134 | 1731 | 102438 |
Kristian Harder | 134 | 1613 | 96571 |
Peter R Hobson | 133 | 1590 | 94257 |
Christopher Seez | 132 | 1256 | 89943 |
Liliana Teodorescu | 132 | 1471 | 90106 |
Umesh Joshi | 131 | 1249 | 90323 |