Download or read book Measurement of the Ratio GEP GMP to Large Q2 written by Vina Punjabi and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In two experiments at Jefferson Lab the ratio of the electromagnetic form factors of the proton, GEp=GMp, was obtained in the four-momentum transfer squared range of 0.5 to 5.6 GeV2 with a polarization transfer technique, by measuring Pt and Pl, the transverse and longitudinal recoil proton polarization in ep --> e'p reaction. In one-photon approximation GEp=GMp is proportional to Pt=Pl; the great strength of this method is the tight control of systematics it affords. The ratio mu GEp=GMp was found to decrease linearly with Q2, down to 0.29 at Q2=5.6 GeV2; revealing a definite difference between the spatial distributions of charge and magnetization at short distances. The combined results of the two JLab experiments were surprising as they appeared to contradict the consensus based on Rosenbluth separation results for (GEp)2 and (GMp)2: the ratio mu pGEp=GMp obtained with the Rosenbluth method is {approx}1 up to 5 GeV2. This unbridgeable difference between cross section and polarization experiments has been reinforced with two recent JLab Rosenbluth experiments; it appears increasingly difficult to explain it away by methodological or systematic errors. We are currently preparing a third experiment at JLab, this time in Hall C, to extend the Q2-range to 9 GeV2.

Download or read book Measurements of GEp GMp to High Q2 and Search for 2 gamma Contribution in Elastic Ep at Jefferson Lab written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The ratio, [mu]pGEp/GMp, where [mu]p is the proton magnetic moment, has been measured extensively over the last decade at the Jefferson Laboratory, using the polarization transfer method. This ratio is extracted directly from the measured ratio of transverse to longitudinal polarizations components of the recoiling proton in elastic electron-proton scattering. The polarization transfer results are of unprecedented high precision and accuracy, due in large part to the small systematic uncertainties associated with the experimental technique. Prior to these measurements, the form factors were empirically observed to exhibit dipole forms, such that [mu]pGEp/GMp ≈ 1 over all regions of momentum transfer studied. With the Hall A results confirming that the ratio [mu]pGEp/GMp shows a steady decrease below unity as a function of Q2, beginning around Q2 ≈ 1 GeV2, discussions revolving around the implication of this deviation from dipole behavior for the structure of the proton have been accompanied by renewed experimental interest in these elastic form factors. Starting in the fall of 2007, two new experiments, GEp-III and GEp-2[gamma] in Hall C at JLab, measured the form factor ratio, GEp/GMp; the GEp-III experiment pushed the highest Q2 limit from 5.6 to 8.49 GeV2, with intermediate points at 5.2 and 6.8 GeV2, and the GEp-2[gamma] experiment measured the ratio in three different kinematics at the constant value Q2=2.5 GeV2, by changing beam energy and detector angles. Preliminary results from both experiments are reported.

Download or read book Exclusive Reactions at High Momentum Transfer written by A. V. Radyushkin and published by World Scientific. This book was released on 2008 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exclusive reactions are becoming one of the major sources of information about the deep structure of nucleons and other hadrons. The 2007 International Workshop held at Jefferson Lab in Newport News, Virginia, USA - the world's leading facility performing research on nuclear, hadronic and quark-gluon structure of matter - focused on the application of a variety of exclusive reactions at high momentum transfer, utilizing unpolarized and polarized beams and targets, to obtain information about nucleon ground-state and excited-state structure at short distances. This is a subject which is central to the programs of current accelerators and especially planned future facilities. This proceedings volume contains, in concentrated form, information about the newest developments, both theoretical and experimental, in the study of hard exclusive reactions.

Download or read book Few body Problems in Physics written by Yupeng Yan and published by World Scientific. This book was released on 2007 with total page 425 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Asia-Pacific Conferences on Few-Body Problems in Physics tackle cover the various aspects of few-body systems in physics, with high caliber contributions from internationally renowned researchers. Readers will gain a clear picture of the latest developments in the field in both the theoretical and experimental sectors.The scope of these proceedings covers research in the following areas: three-body forces and few-nucleon dynamics, hadron structure and QCD; exotic hadrons and atoms; effective field theory in few-body physics; electromagnetic and weak processes in few-body systems; few-body dynamics in atoms, molecules, Bose-Einstein condensates and quantum dots; few-body approaches to unstable nuclei, nuclear astrophysics and nuclear clustering aspects; and hypernuclear physics.

Download or read book Relativistic Nuclear Physics And Quantum Chromodynamics Proceedings Of Xth International Seminar On High Energy Physics Problems written by V V Burov and published by World Scientific. This book was released on 1991-10-16 with total page 669 pages. Available in PDF, EPUB and Kindle. Book excerpt: The volume of proceedings of the Xth International Seminar on High Energy Physics, Relativistic Nuclear Physics and Quantum Chromodynamics brings together reports from the major experimental collaborations at JINR, Fermilab, Brookhaven, SATURNE, Orsay, GSI Darmstadt, Riken Cyclotron Lab. KEK, SLAC, Novosibirsk, MIT Bates, IHEP USSR and summaries of the major theoretical and experimental advances made in relativistic and nuclear physics over the last two years. The focus of the volume is upon relativistic nuclear physics, but the coverage of topics is sufficiently comprehensive to include many important results of cumulative reactions, polarization phenomena in nuclear physics, non nucleon degrees of freedom in nuclei.

Download or read book Exclusive Processes at High Momentum Transfer written by A. V. Radyushkin and published by World Scientific. This book was released on 2002 with total page 416 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focuses on the physics of exclusive processes at high momentum transfer and their description in terms of generalized parton distributions, perturbative QCD, and relativistic quark models. It covers recent developments in the field, both theoretical and experimental.

Download or read book From Parity Violation to Hadronic Structure and more written by K. de Jager and published by Springer Science & Business Media. This book was released on 2008-06-21 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book contains the proceedings of the third international workshop on From Parity Violation to Hadronic Structure and More. The many applications of parity violation are way beyond the scope of what Lee and Yang could have imagined fifty years after their proposal. For the physics topics discussed during this workshop, the application of parity violation has become a standard work horse allowing for the extraction of many physics topics in different experiments.

Download or read book Advances in Nuclear Physics written by J.W. Negele and published by Springer Science & Business Media. This book was released on 1996-03-31 with total page 323 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume of Advances in Nuclear Physics addresses two very different frontiers of contemporary nuclear physics — one highly theoretical and the other solidly phenomenological. The first article by Matthias Burkardt provides a pedagogical overview of the timely topic of light front quantization. Although introduced decades ago by Dirac, light front quantization has been a central focus in theoretical - clear and particle physics in recent years for two majorreasons. The first, as discussed in detail by Burkardt, is that light-cone coordinates are the natural coordinates for describing high-energy scattering. The wealth of data in recent years on nucleon and nucleus structure functions from high-energy lepton and hadron scattering thus provides a strong impetus for understanding QCD on the light cone. Second, as theorists have explored light front quantization, a host of deep and intriguing theoretical questions have arisen associated with the triviality of the vacuum, the role of zero modes, rotational invariance, and renormalization. These issues are so compelling that they are now intensively investigated on their own merit, independent of the particular application to high-energy scattering. This article provides an excellent introduction and overview of the motivation from high-energy scattering, an accessible - scription of the basic ideas, an insightful discussion of the open problems, and a helpful guide to the specialized literature. It is an ideal opportunity for those with a spectator’s acquaintance to develop a deeper understanding of this important field.

Download or read book Nuclear Physics in the 21st Century written by International Union of Pure and Applied Physics and published by American Institute of Physics. This book was released on 2002-04-09 with total page 1136 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains papers based on all the oral presentations delivered at the INPC 2001. Topics include: nuclear structure, neutrino physics, nuclear astrophysics, nuclear reaction dynamics, high energy nuclear physics, and applications of nuclear science.

Download or read book Physics Division Annual Report written by Argonne National Laboratory. Physics Division and published by . This book was released on 2001 with total page 312 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Spin Structure of the Nucleon written by Erhard Steffens and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 273 pages. Available in PDF, EPUB and Kindle. Book excerpt: A comprehensive survey of the most recent results from the field of quark-gluon structure of the nucleon, in particular how the spin of the nucleon is shared by its constituents. After very intriguing results from CERN and SLAC at the end of the 1980s, the last decade has seen a set of second-generation experiments at high energy accelerators that have yielded precise information on the solution of the 'Spin Crisis' - as well as opening up new questions. The articles are written by experts from the leading collaboration and theory groups as well as providing an expert summary of the state of the art, the book points the way to future research directions. Its main focus is on semi-inclusive and exclusive measurements of deep inelastic lepton scattering, which enables for the first time the determination of the flavor-separated quark spin distributions. Future developments on generalized parton distributions and their interpretation as well as the transverse spin structure are also covered. An indispensable volume for all working in hadronic physics.

Download or read book Nuclear Science Abstracts written by and published by . This book was released on 1973 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Proceedings of the 1967 International Symposium on Electron and Photon Interactions at High Energies written by and published by . This book was released on 1968 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Exclusive Reactions At High Momentum Transfer Proceedings Of The International Workshop written by Anatoly Radyushkin and published by World Scientific. This book was released on 2008-03-13 with total page 453 pages. Available in PDF, EPUB and Kindle. Book excerpt: Exclusive reactions are becoming one of the major sources of information about the deep structure of nucleons and other hadrons. The 2007 International Workshop held at Jefferson Lab in Newport News, Virginia, USA — the world's leading facility performing research on nuclear, hadronic and quark-gluon structure of matter — focused on the application of a variety of exclusive reactions at high momentum transfer, utilizing unpolarized and polarized beams and targets, to obtain information about nucleon ground-state and excited-state structure at short distances. This is a subject which is central to the programs of current accelerators and especially planned future facilities.This proceedings volume contains, in concentrated form, information about the newest developments, both theoretical and experimental, in the study of hard exclusive reactions.

Download or read book Photon hadron Interactions written by Richard P. Feynman and published by Addison-Wesley Longman. This book was released on 1989-01-21 with total page 314 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analyzes the theoretical questions related to electron and photon interactions at high energies.

Download or read book Perspectives in Hadronic Physics written by Sigfrido Boffi and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 287 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the invited and contributed papers presented at the Fourth International Conference on Perspectives in Hadronic Physics and sent to the Editors within the deadline. The Conference was held at the Abdus Salam International Centre for Theoretical Physics (ICTP), Trieste, Italy, from May 12th to 16th, 2003, and was attended by about 100 scientists from 20 countries. The series ofConferences on Perspectives on Hadronic Physics takes place every two years since 1997 and follows the seven Workshops on Perspectives in Nuclear Physics at Intermediate Energies, organized every two years at ICTP since 1983. The aim of these Conferences is to discuss the status-of-the-art concerning the experimental and theoretical investigations of hadronic systems, from nucleons to nuclei and dense nuclear matter, in terms of the relevant underlying degrees of freedom. For such a reason the Fourth Conference has been focused on those experimental and theoretical topics which have been in the last few years the object of intensive investigations, viz. the various approaches employed to describe the structure of hadrons in terms of QCD and QCD inspired models, the recent developments in the treatment of the properties and propagations of hadronic states in the medium, the relevant progress done in the solution of the few- and many- hadron problems, the recent results in the experimental investigation of dense hadronic matter and, last but not least, the physics programs of existing Laboratories and the suggested projects for new Facilities.

Download or read book Intersections Between Particle and Nuclear Physics written by W. T. H. Van Oers and published by . This book was released on 1992 with total page 1192 pages. Available in PDF, EPUB and Kindle. Book excerpt: