Two-Photon Physics at e+ e- Storage Rings PDF Download

Author: H. Kolanoski
Publisher: Springer
ISBN: 3540390332
Category : Science
Languages : en
Pages : 196

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Author: David J Miller
Publisher: World Scientific
ISBN: 9814548456
Category :
Languages : en
Pages : 526

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Book Description
The proceedings report results on all aspects of high energy photon interactions on photon, proton and Pomeron targets. There are significant contributions from the LEP experiments, from ZEUS and H1, from CLEO II and from the TRISTAN experiments in Japan, accompanied by extensive theoretical discussion and predictions for future gamma-gamma colliders.

Author: John Robert Thompson
Publisher:
ISBN:
Category : Electron paramagnetic resonance
Languages : en
Pages : 332

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Author: D O Caldwell
Publisher: World Scientific
ISBN: 981455460X
Category :
Languages : en
Pages : 532

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Book Description
The proceedings blend current and future two-photon physics. Developments since the last Photon-Photon Workshop four years ago are summarized, and the future of the field is projected, not only at existing accelerators, but also at heavy-ion colliders B-factories, and especially linear colliders with back-scattered laser beams.

Author: Toichiro Kinoshita
Publisher: World Scientific
ISBN: 9789810202149
Category : Science
Languages : en
Pages : 1024

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Quantum electrodynamics is an essential building block and an integral part of the gauge theory of unified electromagnetic, weak, and strong interactions, the so-called standard model. Its failure or breakdown at some level would have a most profound impact on the theoretical foundations of elementary particle physics as a whole. Thus the validity of QED has been the subject of intense experimental tests over more than 40 years of its history. This volume presents an up-to-date review of high precision experimental tests of QED together with comprehensive discussion of required theoretical work.

Author: Hermann Kolanoski
Publisher: Springer
ISBN:
Category : Science
Languages : en
Pages : 208

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Author: Ahmed Ali
Publisher: World Scientific
ISBN: 9789971502607
Category : Science
Languages : en
Pages : 896

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With the termination of the physics program at PETRA, and with the start of TRISTAN and the SLC and later LEP, an era of e+e- physics has come to an end and a new one begins. The field is changing from a field of few specialists, to becoming one of the mainstream efforts of the high energy community. It seems appropriate at this moment to summarize what has been learned over the past years, in a way most useful to any high energy physicists, in particular to newcomers in the e+e- field. This is the purpose of the book. This book should be used as a reference for future workers in the field of e+e- interactions. It includes the most relevant data, parametrizations, theoretical background, and a chapter on detectors.

Author:
Publisher:
ISBN:
Category : Power resources
Languages : en
Pages : 780

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Author: Cecilia Tosciri
Publisher: Springer Nature
ISBN: 3030879380
Category : Science
Languages : en
Pages : 171

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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.

Author: J. Thanh Van Tran
Publisher: Atlantica Séguier Frontières
ISBN: 9782863320655
Category : Technology & Engineering
Languages : en
Pages : 630

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