Download or read book Proton Structure Functions at Small X written by and published by . This book was released on 2015 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Proton structure functions are measured in electron-proton collision through inelastic scattering of virtual photons with virtuality Q on protons; x denotes the momentum fraction carried by the struck parton. Proton structure functions are currently described with excellent accuracy in terms of scale dependent parton distribution functions, defined in terms of collinear factorization and DGLAP evolution in Q. With decreasing x however, parton densities increase and are ultimately expected to saturate. In this regime DGLAP evolution will finally break down and non-linear evolution equations w.r.t x are expected to take over. In the first part of the talk we present recent result on an implementation of physical DGLAP evolution. Unlike the conventional description in terms of parton distribution functions, the former describes directly the Q dependence of the measured structure functions. It is therefore physical insensitive to factorization scheme and scale ambiguities. It therefore provides a more stringent test of DGLAP evolution and eases the manifestation of (non-linear) small x effects. It however requires a precise measurement of both structure functions F2 and FL, which will be only possible at future facilities, such as an Electron Ion Collider. In the second part we present a recent analysis of the small x region of the combined HERA data on the structure function F2. We demonstrate that (linear) next-to-leading order BFKL evolution describes the effective Pomeron intercept, determined from the combined HERA data, once a resummation of collinear enhanced terms is included and the renormalization scale is fixed using the BLM optimal scale setting procedure. We also provide a detailed description of the Q and x dependence of the full structure functions F2 in the small x region, as measured at HERA. As a result, predictions for the structure function FL are found to be in agreement with the existing HERA data.
Download or read book Small X Behavior of Deep Inelastic Structure Functions in QCD written by A. Ali and published by Elsevier. This book was released on 2016-06-03 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: Small-x Behavior of Deep Inelastic Structure Functions in QCD covers the proceedings of the DESY topical meeting entitled ""Small-x Behavior of Deep Inelastic Structure Functions in QCD"", held in DESY, Hamburg, Germany on May 14-16, 1990. The book focuses on Quantum Chromo Dynamics (QCD) structure function technology, including structure function measurements, photon structure, multi-parton interactions, and hadronic collisions. The selection first offers information on structure function measurements at Hera and pomeron and odderon in QCD and a two-dimensional conformal field theory. Topics include nucleon structure function measurements, handles on the gluon distribution, and photon structure. The book also examines Regge poles in asymptotic free theories; QCD phenomenology of parton distribution functions at small x; and possible parametrization of parton distributions. The text elaborates on low x structure function and saturation of the parton density and photon diffractive dissociation in deep inelastic scattering. The publication also considers multi-parton interactions in high energy hadronic collisions and bound-state quark and gluon contributions to structure functions in QCD. Discussions focus on bound valence-quark distributions, intrinsic gluon distribution of protons, and intrinsic charm-quark distributions. The selection is a dependable reference for readers interested in small-x behavior of deep inelastic structure functions in QCD.
Download or read book Scaling violations of the proton structure function F2 at small x written by H1 Collaboration and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Spin Structure of the Proton written by Steven D. Bass and published by World Scientific. This book was released on 2008 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the main challenges in nuclear and particle physics in the last 20 years has been to understand how the proton''s spin is built up from its quark and gluon constituents. Quark models generally predict that about 60% of the proton''s spin should be carried by the spin of the quarks inside, whereas high energy scattering experiments have shown that the quark spin contribution is small OCo only about 30%. This result has been the underlying motivation for about 1000 theoretical papers and a global program of dedicated spin experiments at BNL, CERN, DESY and Jefferson Laboratory to map the individual quark and gluon angular momentum contributions to the proton''s spin, which are now yielding exciting results. This book gives an overview of the present status of the field: what is new in the data and what can be expected in the next few years. The emphasis is on the main physical ideas and the interpretation of spin data. The interface between QCD spin physics and the famous axial U(1) problem of QCD (eta and etaprime meson physics) is also highlighted. Sample Chapter(s). Chapter 1: Introduction (159 KB). Contents: Spin Experiments and Data; Dispersion Relations and Spin Sum Rules; g 1 Spin Sum Rules; Fixed Poles; The Axial Anomaly, Gluon topology and g (0) A; Chiral Symmetry and Axial U(1) Dynamics; QCD Inspired Models of the Proton Spin Problem; The Spin-Flavour Structure of the Proton; QCD Fits to g 1 Data; Polarized Quark Distributions; Polarized Glue o g(x, Q 2 ); Transversity; Deeply Virtual Compton Scattering and Exclusive Processes; Polarized Photon Structure Functions; Conclusions and Open Questions: How Does the Proton Spin?. Readership: Academics, as well as physicists working on particle and nuclear physics at the interface of theory and experiment.
Download or read book Proton Structure Function at Small Q 2 written by A. Donnachie and published by . This book was released on 1993 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Structure of the Proton written by R. G. Roberts and published by Cambridge University Press. This book was released on 1993-11-26 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt: This graduate/research level book describes our present knowledge of protons and neutrons, the particles which make up the nucleus of the atom. Experiments using high energy electrons, muons and neutrinos reveal the proton as being made up of point-like constituents, quarks. The strong forces which bind the quarks together are described in terms of the modern theory of quantum chromodynamics (QCD), the â€~glue' binding the quarks being mediated by new constituents called gluons. Larger and new particle accelerators probe the interactions between quarks and gluons at shorter distances. The understanding of this detailed substructure and of the fundamental forces responsible is one of the keys to unravelling the physics of the structure of matter. This book will be of interest to all theoretical and experimental particle physicists.
Download or read book Measurement of the Proton Structure Function F2 at HERA written by Mikihiko Nakao and published by . This book was released on 1994 with total page 150 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the proton structure functions F 2 x Q 2 and F L x Q 2 with the H1 detector at HERA written by Alexandre Alimovich Glazov and published by . This book was released on 1998 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proton and Deuteron F2 Structure Function at Low Q2 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Measurements of the proton and deuteron F2 structure functions are presented. The data, taken at Jefferson Lab Hall C, span the four-momentum transfer range 0.06Qsup2/sup2.8GeVsup2/sup and Bjorken x values from 0.009 to 0.45, thus extending the knowledge of Fsub2/sub to low values of Qsup2/sup at low x. Next-to-next-to-leading-order calculations using recent parton distribution functions start to deviate from the data for Qsup2/sup2 GeVsup2/sup at the low and high x values. Down to the lowest value of Qsup2/sup, the structure function is in good agreement with a parametrization of Fsub2/sub based on data that have been taken at much higher values of Qsub2/sub or much lower values of x, and which are constrained by data at the photon point. The ratio of the deuteron and proton structure functions at low x remains well described by a logarithmic dependence on Qsup2
Download or read book Measurement of the Proton Structure Function FL x Q2 at Low X written by and published by . This book was released on 2008 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proton Structure Functions at Low Q 2 written by James Tickner and published by . This book was released on 1997 with total page 234 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the proton structure functions F2 x Q2 and FL x Q2 with the H1 detector at HERA written by Aleksandre Glazov and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Moments of the Proton Structure Functions written by Gong Ping Yeh and published by . This book was released on 1975 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Proton Structure Functions F 2 x Q 2 an F L x Q 2 with the H1 Detector at HERA written by Alexandre Alimovich Glazov and published by . This book was released on 1998 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proton Structure Functions at Low Q2 written by James Tickner and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Proton Structure Function F2 at Low Bjorken X at the H1 Experiment written by Katharina Müller and published by . This book was released on 1994 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Longitudinal Structure Function and the Small X Gluon Density of the Proton written by A. M. Cooper-Sarkar and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
