Download or read book A Systematic Study of QCD Coupling Constant from Deep Inelastic Measurements written by V. G. Krivochižin and published by . This book was released on 2001 with total page 54 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Study of the Q2 Dependence of the QCD Coupling Constant from the Transverse Momentum of Jets in Deep Inelastic Muon Scattering written by Janet Marie Conrad and published by . This book was released on 1992 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Strong Coupling Constant from Multi jet Events in Deep Inelastic Scattering at HERA written by Kyung Kwang Joo and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the determination of the strong coupling constant $\alpha\sb{s}$ from measurements of multi-jet rates in deep inelastic electron-proton scattering at HERA by the ZEUS collaboration for values of the squared four-momentum transfer $Q\sp2$ between 120 and 3600 GeV$\sp2.$ A total integrated luminosity of 3.2 pb$\sp{-1},$ collected during 1994, was used for the measurement. Jets are identified with the JADE algorithm. The jet rates were fitted to a next-to-leading order $O\ (\alpha\sbsp{s}{2})$ perturbative QCD calculation with $\alpha\sb{s}$ left as a free parameter. Using the fitted value for $\alpha\sb{s}$ the perturbative calculation describes well the measured rates and kinematic properties of multi-jet events. A cut on the angular distribution of parton emission in the $\gamma\sp{\*}$-parton center of mass is introduced to remove forward going jets. The value of $\alpha\sb{s}$ is measured in three $Q\sp2$ regions and finally combined over the full kinematic range. The $\alpha\sb{s}$ value decreases for increasing $Q\sp2,$ consistent with the running of the strong coupling constant, as expected by QCD. The determined value is $\alpha\sb{s}\ (M\sb{Z\sp0})=0.117\pm0.005\ (stat)\ \pm\ \sbsp{0.005}{0.004}(syst\sb{exp})\ \pm\ 0.007\ (syst\sb{theory}).$

Download or read book I A dernai a fizika written by and published by . This book was released on 2005 with total page 564 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On QCD Corrections to Jet Functions and Deep Inelastic Scattering written by Avanish Prashan Basdew-Sharma and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: "This thesis consists of two different studies in the field of precision calculations for elementary particle interactions in QCD. In the first study we developed an automated algorithm to calculate one-loop jet functions. The algorithm has been implemented in the Mathematica package GOJet. By using the geometric subtraction scheme, we regulate the soft and collinear singularities in order to render jet functions finite. The package allows one to calculate jet functions for generic IR-safe observables at one-loop order in QCD. In the second study we calculated, for the first time ever, the doubly fermionic nf2 non-singlet coefficient functions C2 and CL for inclusive Deep Inelastic Scattering (DIS) at order N4LO in the strong coupling constant [alpha]s. By using the optical theorem, the integration-by-parts technique and the method of differential equations, we were able to recursively compute a sufficiently large number of Mellin moments (N = 1500), which allowed us to reconstruct full analytic expressions in both Mellin-N space and Bjorken-x space, in terms of harmonic sums and harmonic polylogarithms respectively. We verified the CFnf3 leading large-nf contributions to the coefficient functions CL(4)(x) and C2(4)(x). On top of what we agree with the coefficients of the large-x plus-distribution in C2 and with the resummations of log(x) and log(1 − x). As a byproduct we verified the N3LO nf2 non-singlet splitting function Pns(3)+(x). Furthermore, the no-[pi]2 theorem allowed us to predict the [zeta]4-terms of the 5-loop non-singlet splitting function at order CFCAnf3 and order CF2nf3."--

Download or read book QCD at HERA written by Michael Kuhlen and published by Springer. This book was released on 2014-03-12 with total page 176 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book provides a review of the hadronic final state measurements at HERA in deep inelastic scattering. It covers general event properties, particle spectra, heavy flavours, jets, event shape measurements, QCD instantons and small-x physics. The emphasis is on experimental results, providing quick access to the data (complete up to fall 1997) for reference. The results are discussed in the context of QCD.

Download or read book Measurement of the strong coupling constant alpha tief s from jet rates in deep inelastic scattering written by Richard Nisius 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 Recent QCD Results in nu N Deep inelastic scattering at CCFR NUTEV written by and published by . This book was released on 1998 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present recent QCD results in [nu]-N scattering at the Fermilab CCFR/NuTeV experiments. We present the latest Next-to-Next-Leading order strong coupling constant, [alpha]{sub s}, extracted from Gross-Llewellyn-Smith sum rule. The value of [alpha]{sub s} from this measurement, at the mass of Z boson, is [alpha]{sub s}{sup NNLO}(M{sub Z}2)=0.114{sub -0.012}{sup +0.009}. We also present a preliminary result of the CCFR F2 at large-x. This measurement of F2 is compared to other experiments and various models that provide nuclear effects. We discuss the previous strange sea quark measurement from the CCFR experiment and the prospects for improvements of the measurement in the NuTeV experiment.

Download or read book The Standard Theory of Particle Physics written by Luciano Maiani and published by World Scientific Publishing Company. This book was released on 2016-08-25 with total page 483 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book gives a quite complete and up-to-date picture of the Standard Theory with an historical perspective, with a collection of articles written by some of the protagonists of present particle physics. The theoretical developments are described together with the most up-to-date experimental tests, including the discovery of the Higgs Boson and the measurement of its mass as well as the most precise measurements of the top mass, giving the reader a complete description of our present understanding of particle physics.

Download or read book Determination of the Strong Coupling Constant from Dijet Production in Deep Inelastic Scattering at HERA written by Mathieu Plamondon and published by . This book was released on 2005 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt: "In the present analysis, the constant alphas of Quantum Chromodynamics (QCD) is determined from dijets production in the regime of neutral current deep inelastic scattering (NC DIS) with high momentum transfer Q2. This measurement uses the data collected between the years 1998 to 2000 by the ZEUS detector located on the HERA ring collider in Hamburg, Germany. Corresponding to an integrated luminosity of 82.7 pb-1, the data were produced by the interactions between 27.5 GeV electrons (or positrons) and 920 GeV protons. Defined in a phase space reducing the theoretical and systematic uncertainties, the dijet production is observed as well as the total inclusive DIS cross-section. The resulting observable, the ratio of dijets over the number of DIS events, is then compared to the NLO predictions provided by the program DISENT. From a QCD fit performed on four bins in Q2, we obtain a value consistent with the world average: alpha s(MZ) = 0.1157 +/- 0.0017( stat.) +0.0054-0.00 59 (syst.) +0.0075-0.00 65 (th.)." --

Download or read book Qcd Perturbative Or Nonperturbative Proceedings Of The Xvii Autumn School written by Lidia S Ferreira and published by World Scientific. This book was released on 2000-11-24 with total page 510 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume presents a selection of current developments in quantum chromodynamics, with some emphasis on the borderline between the perturbative and the nonperturbative regime. The topics include: effective QCD, sum rules, vacuum structure, confinement, bound states, quark masses, lattice QCD, deconfinement, deep inelastic scattering and structure functions, strong coupling constant, radiative corrections.

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 Qcd 20 Years Later In 2 Volumes written by H A Kastrup and published by World Scientific. This book was released on 1993-06-30 with total page 895 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings provide a general summary of the theoretical and experimental results which have established QCD as the theory of the strong interactions in the past 20 years. The experimental status of this theory in e⁺e⁻ annihilation, deep inelastic lepton-nucleon scattering and hadron-hadron collisions is reviewed and the theoretical implications are critically discussed. In addition, our knowledge on the non-perturbative sector of QCD, based on lattice and sum rule approaches, is summarized.

Download or read book QCD and Collider Physics written by R. K. Ellis and published by Cambridge University Press. This book was released on 2003-12-04 with total page 462 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed overview of the physics of high-energy colliders emphasising the role of QCD.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 782 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hadron Collider Physics Proceedings Of The Xi Symposium written by D Bisello and published by World Scientific. This book was released on 1997-06-01 with total page 814 pages. Available in PDF, EPUB and Kindle. Book excerpt: The proceedings of this series of annual symposia represent an extensive summary of the experimental and theoretical status of high energy physics at hadron colliders. This volume discusses the latest results on top and beauty physics, QCD, electroweak physics and searches for new particles. The prospects of this field for LHC, Tevatron and Hera machines are also reported.

Download or read book Experimental Apparatus For High Energy Particle Physics And Astrophysics Proceedings Of The 4th San Miniato Topical Seminar written by Francesco Luigi Navarria and published by World Scientific. This book was released on 1991-07-22 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Proceedings discusses the present state of the art in detector development and design for high energy particle physics and astrophysics, both for the next generation experiments and for apparatus upgrade.