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![Gamma* Gamma --] Pi Pi at Large Q2 PDF](https://books.google.com/books/content/images/frontcover/XpBjAQAACAAJ?fife=w150-h200)
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Languages : en
Pages : 5
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The QCD analysis of the process [gamma]*[gamma] → [pi][pi] at large Q2 and small center-of-mass energy allows one to access a new hadronic observable describing the exclusive transition from a q {bar q} or gg state to a pair of mesons. A fruitful study may be envisaged at existing machines.
![Gamma* Gamma --] Pi Pi at Large Q2 PDF](https://books.google.com/books/content/images/frontcover/XpBjAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 5
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Book Description
The QCD analysis of the process [gamma]*[gamma] → [pi][pi] at large Q2 and small center-of-mass energy allows one to access a new hadronic observable describing the exclusive transition from a q {bar q} or gg state to a pair of mesons. A fruitful study may be envisaged at existing machines.
![On the Physical Relevance of the Study of Gamma* Gamma -] Pi Pi at Small T and Large Q2 PDF](https://books.google.com/books/content/images/frontcover/SaeMAQAACAAJ?fife=w80-h100)
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Languages : en
Pages : 7
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We discuss the relevance of a dedicated measurement of exclusive production of a pair of neutral pions in a hard [gamma]*[gamma] scattering at small momentum transfer. In this case, the virtuality of one photon provides us with a hard scale in the process, enabling us to perform a QCD calculation of this reaction rate using the concept of Transition Distribution Amplitudes (TDA). Those are related by sum rules to the pion axial form factor F{sub A}{sup [pi]} and, as a direct consequence, a cross-section measurement of this process at intense beam electron-positron colliders such as CLEO, KEK-B and PEP-II, or Super-B would provide us with a unique measurement of the neutral pion axial form factor F{sub A}{sup [pi]0} at small scale. We believe that our models for the photon to meson transition distribution amplitudes are sufficiently constrained to give reasonable orders of magnitude for the estimated cross sections. Cross sections are large enough for quantitative studies to be performed at high luminosity ee− colliders. After verifying the scaling and the [phi] independence of the cross section, one should be able to measure these new hadronic matrix elements, and thus open a new gate to the understanding of the hadronic structure. In particular, we argued here that the study of [gamma]*[gamma] 2![pi]°{pi}° in the TDA regime could provide with a unique experimental measurement of the {pi}° axial form factor.
![Gamma* Gamma --] Pi Pi at Large Q[sup 2]. PDF](https://books.google.com/books/content/images/frontcover/S7MiDQEACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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The QCD analysis of the process[gamma]*[gamma][yields][pi][pi] at large Q[sup 2] and small center-of-mass energy allows one to access a new hadronic observable describing the exclusive transition from a q[bar q] or gg state to a pair of mesons. A fruitful study may be envisaged at existing machines.
![Measurement of the Two-photon Reaction [gamma Gamma] --> [pi+ Pi- Pi+ Pi-] at Large Values of Q2 PDF](https://books.google.com/books/content/images/frontcover/LeDJHAAACAAJ?fife=w80-h100)
Author: TASSO Collaboration
Publisher:
ISBN:
Category :
Languages : en
Pages : 8
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Author: Friedrich Jegerlehner
Publisher: Springer
ISBN: 3540726349
Category : Science
Languages : en
Pages : 433
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This book reviews the present state of knowledge of the anomalous magnetic moment a=(g-2)/2 of the muon. The muon anomalous magnetic moment is one of the most precisely measured quantities in elementary particle physics and provides one of the most stringent tests of relativistic quantum field theory as a fundamental theoretical framework. It allows for an extremely precise check of the standard model of elementary particles and of its limitations.
Author: Ian J.R. Aitchison
Publisher: CRC Press
ISBN: 1466591129
Category : Science
Languages : en
Pages : 979
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Book Description
The fourth edition of this well-established, highly regarded two-volume set continues to provide a fundamental introduction to advanced particle physics while incorporating substantial new experimental results, especially in the areas of CP violation and neutrino oscillations. It offers an accessible and practical introduction to the three gauge theories included in the Standard Model of particle physics: quantum electrodynamics (QED), quantum chromodynamics (QCD), and the Glashow-Salam-Weinberg (GSW) electroweak theory. In the first volume, a new chapter on Lorentz transformations and discrete symmetries presents a simple treatment of Lorentz transformations of Dirac spinors. Along with updating experimental results, this edition also introduces Majorana fermions at an early stage, making the material suitable for a first course in relativistic quantum mechanics. Covering much of the experimental progress made in the last ten years, the second volume remains focused on the two non-Abelian quantum gauge field theories of the Standard Model: QCD and the GSW electroweak theory. A new chapter on CP violation and oscillation phenomena describes CP violation in B-meson decays as well as the main experiments that have led to our current knowledge of mass-squared differences and mixing angles for neutrinos. Exploring a new era in particle physics, this edition discusses the exciting discovery of a boson with properties consistent with those of the Standard Model Higgs boson. It also updates many other topics, including jet algorithms, lattice QCD, effective Lagrangians, and three-generation quark mixing and the CKM matrix. This revised and updated edition provides a self-contained pedagogical treatment of the subject, from relativistic quantum mechanics to the frontiers of the Standard Model. For each theory, the authors discuss the main conceptual points, detail many practical calculations of physical quantities from first principles, and compare these quantitative predictions with experimental results, helping readers improve both their calculation skills and physical insight.
Author: Marco M. Peloso
Publisher: World Scientific
ISBN: 9814304026
Category : Science
Languages : en
Pages : 565
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Book Description
"This volume contains the proceedings of the workshop "Crossing the Boundaries: Gauge Dynamics at Strong Coupling", hosted by the William I. Fine Theoretical Physics Institute at the University of Minnesota, May 14 - 17, 2009. The workshop honored the 60th birthday of Professor Misha Shifman and his outstanding achievements in the field of gauge dynamics. The meeting attracted a fascinating group of researchers working on the cutting edge of dynamics of gauge theories, including supersymmetric and stringtheories. Their talks covered a wide area of recent developments in the field."--Publisher's website.
Author: University of Rochester. Dept. of Physics and Astronomy
Publisher:
ISBN:
Category :
Languages : en
Pages : 35
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Author: Ian J R Aitchison
Publisher: CRC Press
ISBN: 1466513020
Category : Science
Languages : en
Pages : 438
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Book Description
Volume 1 of this revised and updated edition provides an accessible and practical introduction to the first gauge theory included in the Standard Model of particle physics: quantum electrodynamics (QED).The book includes self-contained presentations of electromagnetism as a gauge theory as well as relativistic quantum mechanics. It provides a uniqu
Author: Bernard Frois
Publisher: World Scientific
ISBN: 9814545406
Category :
Languages : en
Pages : 702
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Book Description
From its early beginnings at SLAC in the 1970's, the study of nucleon spin structure using polarized lepton beams and polarized nucleon targets has become increasingly important in nuclear and particle physics, with current experiments at several of the world's high energy and nuclear physics laboratories (CERN, DESY, SLAC and Jefferson Lab) and with enormous related theoretical studies. The understanding of the fascinating but complicated problem of nucleon spin structure has progressed substantially, but fundamental questions remain and it can be confidently predicted that future activity will be high.The Erice Course on The Spin Structure of the Nucleon covered both the experimental and theoretical aspects of the subject, and this volume includes the lectures given at the School. In many cases the lecture material has been extended and updated by the authors. In addition, several recent publications on experimental work have been added in an appendix.
