Download or read book Nucleon Structure from Stochastic Estimators written by Johannes Siegfried Samir Najjar and published by Universitatsverlag Regensburg. This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure of the proton and neutron, parameterized by moments of generalized parton distribution functions (GPDs), can be accessed from first principle through the computation of baryon three-point functions with lattice QCD. The numerical effort involved in such computations is quite high and thus an efficient algorithm that extracts most information at given cost is highly desirable. In this work we demonstrate that stochastic estimation techniques can efficiently increase the information/cost ratio. We examine the available results at $N_f=2$ for the nucleon axial coupling $g_A$ and iso-vector quark momentum fraction $\langle x \rangle _{u-d}$ from various collaborations and compare them to the experimental values. The tension between them is attributed to excited state contributions (ESC). We furthermore study the impact of this ESC in moments of GPDs through a model fit. This model also deals with the effects of the choice of parameters used in the computation, like the source-sink separation $t_{\mathrm{sink}}$. We demonstrate that the choice of $t_{\mathrm{sink}}$ by the Regensburg group in previous studies was reasonable and cannot account for discrepancies with the experiment. To reduce the excited state contributions in two-point functions, and consequently three-point functions, we suggest a non-Gaussian quark smearing. This is a linear combination of two Gaussian smearings with one free parameter, which can be tuned to an optimal choice with a fit.
Download or read book Nucleon structure proceedings written by International Conference on Nucleon Structure, Stanford, Calif., 1963 and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleon Structure in the Static Theory written by George Salzman and published by . This book was released on 1956 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Computational Stochastic Mechanics written by P.D. Spanos and published by CRC Press. This book was released on 1999-11-09 with total page 628 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proceedings of the June, 1998 conference. Seventy contributions discuss Monte Carlo and signal processing methods, random vibrations, safety and reliability, control/optimization and modeling of nonlinearity, earthquake engineering, random processes and fields, damage/fatigue materials, applied prob
Download or read book The Spin Structure Of The Nucleon written by Bernard Frois and published by World Scientific. This book was released on 1998-02-24 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Download or read book Lattice 92 written by Jan Smit and published by . This book was released on 1993 with total page 992 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Lattice written by and published by . This book was released on 1998 with total page 1062 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Statistical Models for Nucleon Structure Function written by Carlos Alberto Mirez Tarrillo and published by Cambridge Scholars Publishing. This book was released on 2024-01-22 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt: The structure function describes how energy/momentum is distributed among the quarks/gluon inside a nucleon. This is estimated from the deep inelastic scattering of electrons or muon with the nucleon, or even with nucleon-nucleon scattering. This book reviews several statistic/thermodynamic models for both polarized and unpolarized structure function, with additional applications, such as the study of the EMC effect. It will appeal to both researchers and students of hadronic and nuclear/particle physics.
Download or read book Contemporary Topics in Medium Energy Physics written by K. Goeke and published by Springer Science & Business Media. This book was released on 2013-06-29 with total page 357 pages. Available in PDF, EPUB and Kindle. Book excerpt: The primary objective of the book on "Contemporary Topics in Medium Energy Physics" is to help the reader in exploring important frontier research, as of the year of 1992, in the area of medium energy physics. The book is the result of the multi-pronged efforts by the authors who were invited to speak at the Second German Chinese Symposium on "Medium Energy Physics" (September 7-10, 1992, Bochum, Germany). The premise of the meeting is to investigate primarily how quantum chromo dynamics (QCD), the candidate theory of strong interactions, manifests itself in high energy and nuclear physics. This book is divided into four parts: (i) field-theoretic treatments in QCD; (ii) effective chirally symmetric models and QCD; (iii) electroweak physics in general; and (iv) topological solutions. The focus is more on exposition of new ideas, rather than a comprehensive review of the current status, concerning these subjects, as of the year of 1992. As there are many distinctly different research areas in contemporary intermediate energy physics, we could only choose a few topics of current interest, especially those which are related, directly or indirectly, to the structural studies of the nucleon (proton or neutron). Fortunately, there are in recent years merging trends in these studies: There is a call for an alternative, and more efficient, method to handle problems related to strong interactions (as described by QCD). This is the focus of the papers included in Part I.
Download or read book Nucleon Structure from Lattice QCD written by Simon Dinter and published by . This book was released on 2012 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Abstract Bulletin written by and published by . This book was released on with total page 776 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Aspects of Nucleon Structure written by Johan Linde and published by . This book was released on 1994 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 702 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleon Structure Functions written by Franz Eisele and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Nucleon Structure in a Semirelativistic Constituent Quark Model written by Joowon Cho and published by . This book was released on 1998 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Overview of Nucleon Structure Studies written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A brief overview of the recent activity in the measurement of the elastic electromagnetic proton and neutron form factors is presented. It is discussed how the quality of the data has been greatly improved by performing double polarization experiments, and the role of two-photon exchange processes will be highlighted. The spatial information on the quark charge distribibutions in the nucleon resulting from the form factors measurements will be discussed, as well as the steady rate of improvements made in the lattice QCD calculations. It is discussed how generalized parton distributions have emerged as a unifying theme in hadron physics linking the spatial densities extracted from form factors with the quark momentum distribution information residing in quark structure functions. The recent progress in the electromagnetic excitation of the $\Delta(1232)$ resonance will also briefly be discussed.
Download or read book Nucleon structure function at small x written by Evgenij M. Levin and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
