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Parity Violation Experiments At Jefferson Laboratory
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Book Synopsis Parity Violation Experiments at Jefferson Laboratory by : Jacques Arvieux
Download or read book Parity Violation Experiments at Jefferson Laboratory written by Jacques Arvieux and published by . This book was released on 2005 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: A short history of parity violation is given, leading to the present use of parity violating electron scattering for studying the nucleon internal structure. The status of the G0 and HAPPEX experiments presently running at Jefferson Lab is discussed. Some preliminary results are shown.
Book Synopsis Parity Violation at 8-12 GeV at Jlab by :
Download or read book Parity Violation at 8-12 GeV at Jlab written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Experiments on parity violation in electron scattering measure the asymmetry A =?{sub R} -?{sub L}/?{sub R} +?{sub L} where?{sub R(L)} is the cross section for Right(Left) handed longitudinally polarized electrons. This asymmetry arises, in first order, from the interference between photon and Z-boson exchange amplitudes. Experiments make two basic uses of the Z-boson as a probe in electron-quark or electron-nucleon scattering. Historically the first usage was to test the electroweak theory in regions of kinematics where the hadronic structure is sufficiently understood. They discuss the application of higher energies at Jefferson Lab to repeat the SLAC e-D deep inelastic parity violation experiment [1] at a level of precision ≈ 0.5% in sin2?{sub W} which would be a useful constrain on extensions of the Standard Model [2]. The second, more recent usage of the Z-boson probe is to assume the Standard Model is correct at about the 1% level and use this as a unique method to address fundamental issues of nucleon structure, such as: (1) are the strange quarks an important component of the nucleon [3]; (2) In deep inelastic scattering, are the high momentum quarks u or d quarks? To address the first question, they discuss the feasibility of extending the HAPPEX experiment to higher Q2. For the second question, they discuss a possible measurement of the ratio of valence quarks d/u in the proton using deep inelastic parity violation.
Book Synopsis Parity Violation Inelastic Scattering Experiments at 6 GeV and 12 GeV Jefferson Lab by :
Download or read book Parity Violation Inelastic Scattering Experiments at 6 GeV and 12 GeV Jefferson Lab written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the measurement of parity-violating asymmetries in the deep inelastic scattering and nucleon resonance regions using inclusive scattering of longitudinally polarized electrons from an unpolarized deuterium target. The effective weak couplings C$_{2q}$ are accessible through the deep-inelastic scattering measurements. Here we report a measurement of the parity-violating asymmetry, which yields a determination of 2C$_{2u}$ - C$_{2d}$ with an improved precision of a factor of five relative to the previous result. This result indicates evidence with 95% confidence that the 2C$_{2u}$ - C$_{2d}$ is non-zero. This experiment also provides the first parity-violation data covering the whole resonance region, which provide constraints on nucleon resonance models. Finally, the program to extend these measurements at Jefferson Lab in the 12 GeV era using the Solenoidal Large Intensity Device was also discussed.
Book Synopsis From Parity Violation to Hadronic Structure and more by : Serge Kox
Download or read book From Parity Violation to Hadronic Structure and more written by Serge Kox and published by Springer Science & Business Media. This book was released on 2007-06-07 with total page 198 pages. Available in PDF, EPUB and Kindle. Book excerpt: Almost 50 years after the proposal of Lee and Young in 1956 to test the hypothesis of parity violation in weak interactions and the subsequent experimental verification of parity violation by C. S. Wu, parity violation has today become a useful property of weak interactions. This is due to the fact that the focus nowadays has changed: parity violation in weak interactions is no more a topic of investigation but is used as a tool in many different fields ranging from nuclear physics to the search for the hidden extra dimensions requested by string theory. For our first workshop which took place June 5-8, 2002, at the Institut fiir Ke- physik of the Johannes Gutenberg-Universitat Mainz, we concentrated on the in vestigation of the strangeness contribution in the nucleon. This book contains the refereed and selected papers of the second workshop "From Parity Violation to Hadron Structure and more (Part II)", which took place June 8-11, in the Labo- toire de Physique Subatomique et de Cosmologie, in Grenoble. These papers appear in EPJAdirect, the electronic-only part of EPJA, and they are accessible without restrictions. They will also appear in printed form and can be ordered through Springer. The excellent presentations show the dramatic and steady progress in the accuracy of measured parity violating asymmetries over the last few years.
Book Synopsis From Parity Violation to Hadronic Structure and more by : K. de Jager
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.
Book Synopsis Parity Violation in Deep Inelastic Scattering at JLab 6 GeV. by : Xiaochao Zheng
Download or read book Parity Violation in Deep Inelastic Scattering at JLab 6 GeV. written by Xiaochao Zheng and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The parity-violating asymmetry in e-$^2$H deep inelastic scattering (DIS) can be used to extract the weak neutral-current coupling constants $C_{2q}$. A measurement of this asymmetry at two $Q^2$ values is planned at Jefferson Lab. Results from this experiment will provide a value of $2C_{2u}-C_{2d}$ to a precision of $\pm 0.03$, a factor of eight improvement over our current knowledge. If all hadronic effects can be understood, this results will provide information on possible extensions of the Standard Model, complementary to other experiments dedicated to new physics searches. Presented here are the physics motivation, experimental setup, potential hadronic effects and their implications, and the future of PV DIS at Jefferson Lab.
Download or read book Res-Parity written by and published by . This book was released on 2006 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Parity violating electron scattering has become a well established tool which has been used, for example, to probe the Standard Model and the strange-quark contribution to the nucleon. While much of this work has focused on elastic scattering, the RES-Parity experiment, which has been proposed to take place at Jefferson Laboratory, would focus on inelastic scattering in the low-Q2, low-W domain. RES-Parity would search for evidence of quark-hadron duality and resonance structure with parity violation in the resonance region. In terms of parity violation, this region is essentially unexplored, but the interpretation of other high-precision electron scattering experiments will rely on a reasonable understanding of scattering at lower energy and low-W through the effects of radiative corrections. RES-Parity would also study nuclear effects with the weak current. Because of the intrinsic broad band energy spectrum of neutrino beams, neutrino experiments are necessarily dependent on an untested, implicit assumption that these effects are identical to electromagnetic nuclear effects. RES-Parity is a relatively straight forward experiment. With a large expected asymmetry (~ 0.5 x 10-4) these studies may be completed with in a relatively brief period.
Download or read book Gramineæ written by and published by . This book was released on 1880 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Status of the Jefferson Lab Polarized Beam Physics Program and Preparations for Upcoming Parity Experiments by :
Download or read book Status of the Jefferson Lab Polarized Beam Physics Program and Preparations for Upcoming Parity Experiments written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: An ambitious nuclear physics research program continues at Jefferson Lab with Users at three experiment halls receiving reliable, highly polarized electrons at currents to 100 [micro]A. The polarized photoguns and drive lasers that contribute to Jefferson Lab's success will be described as well as significant events since PES2000. Typical of conditions at accelerators worldwide, success brings new challenges. Beam quality specifications continue to become more demanding as Users conduct more challenging experiments. In the months that follow this workshop, two parity violation experiments will begin at Jefferson Lab, G0 and HAPPEx2. The photogun requirements for these experiments will be discussed as well as our plans to eliminate/minimize systematic errors. Recent efforts to construct high power Ti-Sapphire drive lasers for these experiments also will be discussed.
Book Synopsis The HAPPEX Experiment at Jefferson Laboratory by :
Download or read book The HAPPEX Experiment at Jefferson Laboratory written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A new experimental program is under way at Jefferson Laboratory to probe the strange structure of the nucleon via parity violating electron scattering, HAPPEX is the first experiment from this program to run Jefferson Laboratory. We describe the physics motivation, provide an experimental overview and report on the results from the first data run. The asymmetry for the elastic scattering of 3.3 GeV electrons off target protons at a scattering angle of 12.5 degrees was measured to a precision of 15% of itself. The contribution from strange quark form factors was found to be zero within the experimental and theoretical uncertainties.
Book Synopsis Parity Violation In Atoms And In Polarized Electron Scattering by : Marie-anne Bouchiat
Download or read book Parity Violation In Atoms And In Polarized Electron Scattering written by Marie-anne Bouchiat and published by World Scientific. This book was released on 1999-07-13 with total page 550 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the last few years there has been considerable progress in improving the accuracy of parity violation experiments in electron scattering at high energy and in atomic physics. Recent results are a challenge to the standard electroweak theory and our understanding of hadron structure. This book is an extensive review of the advances in this field. The theoretical framework is presented at a pedagogical level, experiments and future projects are reviewed, and the results and their interpretation are discussed in depth.
Book Synopsis The Qweak^p Experiment at Jefferson Laboratory by :
Download or read book The Qweak^p Experiment at Jefferson Laboratory written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A major new experiment is being prepared at Jefferson Laboratory to measure the proton's weak charge via the parity violating asymmetry in elastic electron-proton scattering at very low momentum transfer. The Standard Model makes a firm prediction of the protonâ s weak charge, Q_w^p = 1 - 4 sin2thetaW, based on the running of the weak mixing angle sin2thetaW from the Z^0 pole down to low energies, corresponding to a 10sigma effect in our experiment. Our ultimate goal is to determine the protonâ s weak charge with 4% combined statistical and systematic errors, which in turn leads to a 0.3% measurement of sin2 thetaW. The experiment is currently under construction; installation in Hall C at Jefferson Lab followed by data taking is planned for 2009.
Book Synopsis Outlook of an Improved Measurement of Parity Violation in Moeller Scattering at JLab (e2ePV). by :
Download or read book Outlook of an Improved Measurement of Parity Violation in Moeller Scattering at JLab (e2ePV). written by and published by . This book was released on 2008 with total page 15202 pages. Available in PDF, EPUB and Kindle. Book excerpt: Jefferson Laboratory has the potential to make a dramatically improved measurement of parity violation in Moeller scattering (e + e â e + e). In the context of the Standard Model, the measurement would yield the best determination of sin2  W at low energy ( sin2  W = ±0.00025), and one of the best at any energy scale. As a new physics search via the running of the weak mixing angle, the experiment would have unparalleled sensitivity to new parity-violating e? e interactions, probing electron substructure to 29 TeV (95% CL). In terms of specific models, pulls of 6A are allowed in R-parity violating SUSY, about 5A in E6 Z2, and almost 3A in R-parity conserving SUSY. The latter makes an improved Moeller measurement complementary to searches for SUSY loop-induced Electric Dipole Moments. Interpretability limits are well below the projected experimental error. A conceptual design for a 12 GeV JLab experiment is presented.
Book Synopsis The G0 Experiment At Jefferson Lab by :
Download or read book The G0 Experiment At Jefferson Lab written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The electron-proton parity-violation G0 experiment at Jefferson Lab aims to make a determination of the 'strange' quark currents in the proton. Two new proton ground state matrix elements will be measured which are sensitive to point-like 'strange' quarks and hence to the quark-antiquark sea in the proton. The matrix elements of interest are the elastic-scattering vector weak neutral-current 'charge' and 'magnetic' form factors, GZE and GZM, respectively. By measuring the very small parity-violating asymmetries in elastic electron-proton scattering at momentum transfers between 0.1 and 1.0 GeV2, and combining these asymmetries with previously measured electromagnetic form factors, new information about the proton weak form factors can be obtained. This new high precision experiment is presently in the installation and commissioning phase.
Book Synopsis Unfolding the Matter of Nuclei by : Società italiana di fisica
Download or read book Unfolding the Matter of Nuclei written by Società italiana di fisica and published by IOS Press. This book was released on 1998 with total page 544 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nucleus and its constituents are a challenging problem. The lectures collected in this book present a broad and comprehensive review of the current knowledge about nuclei.They cover topics such as searching for signatures of the quarks in nuclei with electromagnetic probes and, at much higher energies, for signatures of the quark-gluon plasma in ultrarelativistic nuclear collisions. The attempts to obtain new nuclei in the laboratory are also discussed, as well as the central role played by nuclear physics in the development of weak interactions. Progress in all these areas rests on a deeper theoretical handling of the nuclear and nucleon’s structure. The latter can also be addressed by relying on numerical solutions of QCD on a discrete space-time lattice. The advancement of computational capabilities has spurred a growing interest in this approach. Finally, the book deals with different paths toward solving non-perturbative QCD.
Download or read book Chiral Dynamics written by Jos L. Goity and published by World Scientific. This book was released on 2001 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides an authoritative, up to date, overview of the field of chiral dynamics, and also provides an excellent introduction to the field. The workshop is known for the interplay of theory and experiment and as a meeting place for most of the leading researchers in the field.
Book Synopsis Hadron Physics 98, Topics On The Structure And Interaction Of Hadronic Systems by : Sidney Dos Santos Avancini
Download or read book Hadron Physics 98, Topics On The Structure And Interaction Of Hadronic Systems written by Sidney Dos Santos Avancini and published by World Scientific. This book was released on 1999-07-05 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: The study of QCD in the confinement regime poses some of the most difficult problems of fundamental physics at present. The mechanism of confinement itself is not described formally, and it is hard to investigate the properties of the fundamental theory in the determination of the structures and interactions of hadronic systems. The strong coupling and the extreme non-linearity of the theory severely limit the applicability and the extension and generalization of models and methods. The area of particle/nuclear physics called Hadron Physics deals with the phenomena determined by the confinement regime of QCD.The International Workshop on Hadron Physics 98 aimed to provide a framework for the comparative evaluation of different approaches to the difficult problems of QCD, and gathered together experts who have been leading developments in hadronic physics in recent years. As a central feature of the workshop program, there were four sets of lectures: (1) “An Introduction to Effective Field Theory” (J F Donoghue); (2) “Non-perturbative QCD” (A Di Giacomo); (3) “Diffraction: Past, Present and Future” (E Predazzi); “QCD at High Temperature and Density” (T Hatsuda). These courses provided a pedagogical and updated account of the recent developments that gave support to the discussion of frontier research problems. The lecturers did very useful work in the review and description of important lines of research.The lectures are reproduced in this book, together with invited talks and contributed papers dealing with specific research problems, for the use and appreciation of a wider audience.
