Download or read book Tests of QCD with Polarized Electrons written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present three measurements that exploit the highly-polarized incident electrons of the SLC facility to probe QCD and the hadronization process. We observe preliminary evidence for leading particle production in hadronic decays of the Zo to light-quark pairs. In a high-purity sample of quark jets, the momentum spectra of p, A0, and K( - ) are harder than those of p(bar), A(bar)0, and K(+), supporting the hypothesis that faster particles in jets are more likely to carry the primary quark or antiquark of the jet. Second, we present an improved limit on jet handedness, which seeks to measure the transport of quark spin through the hadronization process. Finally, we search for a correlation of the three jet event orientation with the Zo spin direction, which would indicate new physics beyond the Standard model.

Download or read book Testing Qcd Through Spin Observables In Nuclear Targets written by Jian-ping Chen and published by World Scientific. This book was released on 2003-01-16 with total page 338 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the invited talks and contributed papers presented at the workshop on “Testing QCD Through Spin Observables in Nuclear Targets”, held at the University of Virginia in April 2002.The workshop was proposed in the context of the large number of experiments that have used polarized deuterons or polarized 3He to extract information about the spin parameters of the neutron. The motivation for this workshop was to study the effects of the nuclear medium on the spin properties of the bound nucleon and to explore issues in QCD that might be resolved through spin observables in nuclear targets: What is the effect of the nuclear medium on the measured asymmetries? How have the latest results on the spin structure of the nucleon and the nucleon form factors changed our thinking? What advances are anticipated in the development of polarized targets?

Download or read book QCD Tests with Polarized Beams written by and published by . This book was released on 1996 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present three QCD studies performed by the SLD experiment at SLAC, utilizing the highly polarized SLC electron beam. They examined particle production differences in light quark and antiquark hemispheres, and observed more high momentum baryons and K−'s than antibaryons and K's in quark hemispheres, consistent with the leading particle hypothesis. They performed a search for jet handedness in light q- and {anti q}-jets. Assuming Standard Model values of quark polarization in Z° decays, they have set an improved upper limit on the analyzing power of the handedness method. They studied the correlation between the Z° spin and the event-plane orientation in polarized Z° decays into three jets.

Download or read book QCD Tests in Electron positron Scattering written by and published by . This book was released on 1995 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent results on QCD tests at the Z{sup o} resonance are described. Measurements of Color factor ratios, and studies of final state photon radiation are performed by the LEP experiments. QCD tests using a longitudinally polarized beam are reported by the SLD experiment.

Download or read book Deep Inelastic Polarized Electron proton Scattering in QCD microform written by Guy C. Marleau and published by National Library of Canada. This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "We compute the anomalous dimension (gamma)(n) and (gamma)(, ns)(n) needed in the evaluation of the polarized structure function G(,1)(q('2)) in electron-proton scattering, up to and including the order g('4) contributions in the minimal subtraction scheme in perturbative QCD. Both the analytic expression and the numerical result for (gamma)(n) and (gamma)(, ns)(n) with n = 2, 4, 6 ..., 20 are obtained. We also evaluate the second moment of flavor singlet and the flavor non-singlet part of G(,1)(q('2)) in QCD, with 4 and 6 flavors with the Wilson coefficients left as unknowns."--

Download or read book Physics Results with Polarized Electrons at SLAC written by and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: Polarized electron beams can play an important role in the dynamics of interactions at high energies. Polarized electron beams at SLAC have been an important part of the physics program since 1970, when they were first proposed for use in testing the spin structure of the proton. Since 1992, the SLAC linear accelerator and the SLC have operated solely with polarized electrons, providing data for tests of QCD in studies of the spin structure of the nucleon and tests of the electroweak sector of the Standard Model. In the following sections, the performance of the source is summarized, and some of the recent results using the polarized beams are discussed.

Download or read book Basics of Perturbative QCD written by Yuri Dokshitzer and published by Atlantica Séguier Frontières. This book was released on 1991 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Physics With A High Luminosity Polarized Electron Ion Collider Proceedings Of The Workshop On High Energy Nuclear Physics Epic 99 written by Leslie C Bland and published by World Scientific. This book was released on 2000-02-28 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the proceedings of the Workshop on Physics with an Electron-Polarized Ion Collider (EPIC-99), jointly sponsored by the Indiana University Cyclotron Facility and Nuclear Theory Center, and the Institute for Nuclear Theory, University of Washington. It was held in Bloomington, Indiana, April 8-11, 1999. The purpose was to discuss important new physics phenomena which could be investigated with a high-luminosity asymmetric collider consisting of a beam of polarized electrons (with energy roughly 5 GeV), and a beam of polarized protons or other light ions of approximately 40 GeV energy. The Workshop brought together experts in the field who highlighted the unique potential for such a facility, and compared the prospects and challenges for this collider with present and proposed facilities around the world.The proceedings of this Workshop summarize our currently available knowledge on the physics potential for a polarized asymmetric collider. It provides a unique collection of information on the opportunities which such a facility would provide.

Download or read book Tests of QCD in High Energy Spin Reactions written by and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Spin physics in the quark model is discussed, starting with the prediction of the ratio of the proton and neutron magnetic moments. Other experimental tests of the spin-isospin structure of baryon wave functions are considered, including interactions of pions on polarized protons involving spin flip. Also considered are polarization experiments in nucleon-nucleon scattering to test the different mechanisms suggested by QCD for high transverse momentum transfer in hadron-hadron scattering. (LEW).

Download or read book Physics With Polarized Beams On Polarized Targets Proceedings Of The Conference written by J Sowinski and published by World Scientific. This book was released on 1990-08-06 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings presents articles exploring the wide range of physics with can be addressed with measurements using both polarized beams and polarized targets. The conference concentrated on the physics to be done using polarized beams on polarized targets and include selected highlights on advances in the technology. Topics covered include studies of nuclear structure and few-body reactions to test fundamental symmetries, measurements of electromagnetic form factors and of the internal spin structure of nucleons, and tests of QCD.

Download or read book The Development of Perturbative QCD written by G. Altarelli and published by World Scientific. This book was released on 1994 with total page 372 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book consists of a collection of carefully selected review papers and lecture notes written by the author on Perturbative Quantum Chromodynamics (PQCD) and its experimental tests. A leading authority who has contributed significantly to the development of PQCD for more than 20 years, the author has selected articles on the basis of their present interest. These articles cover different aspects of the subject without unnecessary duplication and are accompanied by commentaries. Also, original material, specially written for this book, has been added to integrate and update the results and their presentation. Hence, more than providing a historical perspective on the subject, this volume also serves well as an authoritative guidebook on Perturbative QCD.

Download or read book An Assessment of U S Based Electron Ion Collider Science written by National Academies of Sciences, Engineering, and Medicine and published by National Academies Press. This book was released on 2018-10-13 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Understanding of protons and neutrons, or "nucleons"â€"the building blocks of atomic nucleiâ€"has advanced dramatically, both theoretically and experimentally, in the past half century. A central goal of modern nuclear physics is to understand the structure of the proton and neutron directly from the dynamics of their quarks and gluons governed by the theory of their interactions, quantum chromodynamics (QCD), and how nuclear interactions between protons and neutrons emerge from these dynamics. With deeper understanding of the quark-gluon structure of matter, scientists are poised to reach a deeper picture of these building blocks, and atomic nuclei themselves, as collective many-body systems with new emergent behavior. The development of a U.S. domestic electron-ion collider (EIC) facility has the potential to answer questions that are central to completing an understanding of atoms and integral to the agenda of nuclear physics today. This study assesses the merits and significance of the science that could be addressed by an EIC, and its importance to nuclear physics in particular and to the physical sciences in general. It evaluates the significance of the science that would be enabled by the construction of an EIC, its benefits to U.S. leadership in nuclear physics, and the benefits to other fields of science of a U.S.-based EIC.

Download or read book QCD Tests with SLD and Polarized Beams written by and published by . This book was released on 2003 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the strong coupling a{sub s} derived from multijet rates using data collected by the SLD experiment at SLAC and find that a{sub s}(M{sub Z}2) = 0.118 " 0.002(stat.) " 0.003(syst.) " 0.010(theory). The authors present tests of the flavor independence of strong interactions via preliminary measurements of the ratios a{sub s}(b)/a{sub s}(udse) and a{sub s}(uds)/a{sub s}(bc). In addition, the authors have measured the difference in charged particle multiplicity between Z° --> b{bar b} and Z° --> u{bar u}, d{bar d}, s{bar s} events, and find that it supports the prediction of perturbative QCD that the multiplicity difference be independent of center-of-mass energy. Finally, they have made a preliminary study of jet polarization using the jet handedness technique.

Download or read book Lepton photon Interactions Proceedings Of The Xvii International Symposium written by Zhi Peng Zheng and published by World Scientific. This book was released on 1996-07-26 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt: The is the most important conference on high energy physics in 1995. The speakers and the list of topics discussed are as follows:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Download or read book QCD Tests with Polarized Beams at CBA written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches for parity violating effects of quark substructure and tests of spin dependence predicted by QCD are discussed.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1985 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: