Many high-energy collider experiments (including the current Large Hadron Collider at CERN) involve the collision of hadrons. Hadrons are composite particles consisting of partons (quarks and gluons), and this means that in any hadron-hadron collision there will typically be multiple collisions of the constituents — i.e. multiple parton interactions (MPI). Understanding the nature of the MPI is important in terms of searching for new physics in the products of the scatters, and also in its own right to gain a greater understanding of hadron structure. This book aims at providing a pedagogical introduction and a comprehensive review of different research lines linked by an involvement of MPI phenomena. It is written by pioneers as well as young leading scientists, and reviews both experimental findings and theoretical developments, discussing also the remaining open issues.
Bicontinuous interfacially jammed emulsion gels, now commonly termed 'bijels', are a class of soft materials, in which interpenetrating, continuous domains of two immiscible fluids are maintained in a rigid arrangement by a jammed layer of colloidal particles at their interface. Such gels have unusual material properties that promise exciting applications across diverse fields from energy materials and catalysis, to food science. This is the first book on the subject and provides the reader with a fundamental introduction. Edited by a recognised authority on bijels, the reader will learn about the bijel and its formation. Bringing together current understanding, this book aims to bring the potential application of bijels to diverse materials challenges closer to fruition. This is a must-have resource for anyone working in soft matter and applied fields.
'Everything about this story is astounding' Bryan Appleyard, Sunday Times "Trinity" was the codename for the test explosion of the atomic bomb in New Mexico on 16 July 1945. Trinity is now also the extraordinary story of the bomb's metaphorical father, Rudolf Peierls; his intellectual son, the atomic spy, Klaus Fuchs, and the ghosts of the security services in Britain, the USA and USSR. Against the background of pre-war Nazi Germany, the Second World War and the following Cold War, the book traces how Peierls brought Fuchs into his family and his laboratory, only to be betrayed. It describes in unprecedented detail how Fuchs became a spy, his motivations and the information he passed to his Soviet contacts, both in the UK and after he went with Peierls to join the Manhattan Project at Los Alamos in 1944. Frank Close is himself a distinguished nuclear physicist: uniquely, the book explains the science as well as the spying. Fuchs returned to Britain in August 1946 still undetected and became central to the UK's independent effort to develop nuclear weapons. Close describes the febrile atmosphere at Harwell, the nuclear physics laboratory near Oxford, where many of the key players were quartered, and the charged relationships which developed there. He uncovers fresh evidence about the role of the crucial VENONA signals decryptions, and shows how, despite mistakes made by both MI5 and the FBI, the net gradually closed around Fuchs, building an intolerable pressure which finally cracked him. The Soviet Union exploded its first nuclear device in August 1949, far earlier than the US or UK expected. In 1951, the US Congressional Committee on Atomic Espionage concluded, 'Fuchs alone has influenced the safety of more people and accomplished greater damage than any other spy not only in the history of the United States, but in the history of nations'. This book is the most comprehensive account yet published of these events, and of the tragic figure at their centre.
The spellbinding stories of the scientists whose eureka! breakthroughs in modern physics reveal science's astonishing predictive power. 'An excellent popular science book.' DARA Ó BRIAIN 'A thoroughly informative and entertaining read.' ANNA BURNS, Booker Prize-winning author of Milkman 'One of the best-written books about phsyics I have ever come across.' POPULAR SCIENCE 'Highly entertaining and accessible.' IRISH TIMES 'Fascinating, life enhancing entertainment.' PROSPECT 'Thoroughly enjoyable . . . Chown has down it again.' BBC SKY AT NIGHT The Magicians takes us on a breathtaking, mind-altering tour of the eureka! moments of modern physics. Charting the spellbinding stories of the scientists who predicted and discovered the existence of unknown planets, black holes, invisible force fields, ripples in the fabric of space-time, unsuspected subatomic particles and even antimatter, Marcus Chown reveals science's greatest mystery: its astonishing predictive power.
Audouin Dollfus Observatoire de Paris, Section de Meudon, 92195 Meudon, FRfu~CE The North Atlantic Treaty Organization (NATO) and, in particular, its Department of Scientific Affairs headed by Dr. C. Sinclair, actively supports new fields of science. The recent exploration of the outer parts of the Solar System by spacecraft focused the attention of a large community of scientists on the problem of ices, which playa major role in the accretionary processes in space except for the close neighborhood of the Sun and of other stars. NATO responded to this new interest by agreeing to sponsor an Advanced Research Workshop "Ices in the Solar System", provided a proper organizing body could be set up. It was a pleasure to organize such a workshop jointly with Profes sor Roman Smoluchowski who had earlier organized similar conferences. I knew from the experience of others who managed such meetings in the past that there would be much work, but the opportunity of cooperating with Smoluchowski was very attractive and convinced me to agree. If well organized, the whole project promised to be more than rewarding for a large community of scientists, both in the short run and in the long run, by clarifying certain outstanding questions in astrophysics. It became clear that a well-organized international conference would attract top scientists and help unravel many fundamental problems.
Current Trends in Biomanufacturing focuses on cutting-edge research regarding the design, fabrication, assembly, and measurement of bio-elements into structures, devices, and systems. The field of biomaterial and biomanufacturing is growing exponentially in order to meet the increasing demands of for artificial joints, organs and bone-fixation devices. Rapid advances in the biological sciences and engineering are leading to newer and viable resources, methods and techniques that may providing better quality of life and more affordable health care services. The book covers the broad aspects of biomanufacturing, including: synthesis of biomaterials; implant coating techniques; spark plasma sintering; microwave processing; and cladding, powder metallurgy and electrospinning. The contributors illustrate the recent trends of biomanufacturing, highlighting the important aspects of biomaterial synthesis, and their use as feedstock of fabrication technologies and their characterization, along with their clinical practices. Current Trends in Biomanufacturing updates researchers and scientists the novelties and techniques of the field, as it summarises numerous aspects of biomanufacturing, including synthesis of biomaterials, fabrication of biomedical structures, their in-vivo/ in-vitro, mechanical analysis and associated ISO standards.
Based on the proceedings of the 6th and 7th INFN ELOISATRON project workshops, held at the Centro di Cultura Scientifica Ettore Majorana CCSEM, Erice Trapani, Sicily, Italy, during. June, 1988. Topics were heavy flavor physics experimental results and theoretical interpretations; and high energy physics with 1-100 TeV proton beams experimental re
The predictions of the Standard Model (SM) of particle physics have been probed with remarkable accuracy, so far. The Large Hadron Collider (LHC) at CERN has significantly contributed to this quest. A remarkable achievement of the ATLAS and CMS experiments at the LHC was the discovery of the Higgs boson in 2012, the last missing piece of the SM. With the increasing amount of proton-proton collisions delivered by the LHC, more precise measurements of the Higgs boson are now possible, while rare processes are accessible as well. A property of the Higgs boson that is of particular importance is its coupling to the top quark, which is expected to be the strongest in the SM due to the high mass of the top quark. Therefore, its precise measurement is a stringent test of the SM. A direct measurement of the top-quark Yukawa coupling can be assessed through the Higgs-boson production in association with a pair of top quarks (ttH). This thesis presents the measurement of the ttH process with a subsequent Higgs-boson decay to a pair of b-quarks (H -> bb), the decay mode with the largest branching ratio. The measurement is performed with data collected by the ATLAS detector, corresponding to an integrated luminosity of 139 fb^-1 at a center-of-mass energy of 13 TeV. Events with one or two charged leptons from the tt decay in the final state are considered to the measurement. The main challenge of the ttH(H -> bb) channel emerges from the large SM backgrounds from the production of top-quark pairs with additional jets (tt+jets). Also the many jets coming from b-hadrons (b-jets) in the final state cause combinatorial ambiguities. Thus, the identification of such jets is decisive in order to determine the signal and reject many background processes. The ttH events are split into exclusive analysis regions, based on the number of leptons, jets, and jets tagged as b-jets, providing regions enhanced in signal, or in the main background components. Specifically in the single-lepton channel, a boosted category is defined by selecting events in which the Higgs boson and possibly also the hadronically decaying top quark are produced with high transverse momentum (pT), with their decay products being collimated in large-radius jets. The single-lepton boosted channel targets events with Higgs-boson candidate pT >= 300 GeV and is the main scope of this thesis. To identify the reconstructed objects with the underlying particles and to maximise the discrimination of the ttH signal from the overwhelming tt+jets background events in the signal-enriched regions, machine-learning algorithms are employed. The background is dominated by a tt process with an additional gluon in the final state which further splits into a pair of b-quarks (tt+bb). Besides, a large number of heavy-flavour jets in the final state is not well modelled, thus many systematic uncertainties have to be considered, decreasing the sensitivity of the measurement. All the defined analysis regions are analysed together in a combined profile likelihood fit to test for the presence of signal. The fit simultaneously determines the event yields for the signal and the most important background component, while constraining the overall background model within the assigned systematic uncertainties. Eventually, the ratio of the measured ttH cross section to the SM expectation in the inclusive cross-section measurement is found to be 0.35 +0.36,-0.34}, corresponding to an observed (expected) significance of 1.0 (2.7) standard deviations. A ttH signal strength larger than the SM prediction is excluded at 95% confidence level. The measurement uncertainty is dominated by systematic uncertainties, mainly regarding the theoretical knowledge of the tt +>= 1b background process. Finally, to further test the SM, the cross-section is measured differentially as a function of the generator-level Higgs-boson pT, taking advantage of the reconstruction of the Higgs-boson kinematics.
