Download or read book Determination of the Strong Coupling Constant alpha sub S and a Test of Perturbative QCD Using W Jets Processes in the D0 Detector written by and published by . This book was released on 1993 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 experiment has accumulated data for a study of inclusive W production corresponding to a total integrated luminosity of 14.3 ± 1.7 pb−1 during the 1992--1993 Fermilab Tevatron collider run. The total number of W → e + [nu] candidates is 9770. The ratio of the number of W + 1 jet events to that of W + 0 jet events has been measured as a function of jet minimum E{sub T}. Using this ratio the strong coupling constant, [alpha]{sub s} at Q2 = M{sub W}2 is measured to be [alpha]{sub s}(M{sub W}2) = 0.124 ± 0.005(stat) ± 0.006(MC) ± 0.008(theory){sub -0.022}{sup +0.026}(sys) or ({sub -0.025}{sup +0.028} combined) with a jet minimum E{sub T} of 25 GeV. A quantitative test of perturbative QCD has been made by comparing the experimentally measured ratio with the theoretical predictions. The theoretical predictions of the ratio in both the leading order and next-to-leading order are in good agreement with the measured ratio.
Download or read book Determination of the Strong Coupling Constant sub S and a Test of Perturbative QCD Using W Jets Processes in the D0 Detector written by 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 Determination of the Strong Coupling Constant alpha s and a Test of Perturbative QCD Using W Jets Processes in the D Detector written by Jaehoon Yu and published by . This book was released on 1993 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 674 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Tests of Perturbative QCD in W Jets Events Produced in square Root S written by Daniel Patrick Cronin-Hennessy and published by . This book was released on 1997 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiple Parton Interactions at the LHC written by Paolo Bartalini and published by World Scientific Publishing. This book was released on 2018-11-08 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many high-energy collider experiments (including the current Large Hadron Collider at CERN) involve the collision of hadrons. Hadrons are composite particles consisting of partons (quarks and gluons), and this means that in any hadron–hadron collision there will typically be multiple collisions of the constituents — i.e. multiple parton interactions (MPI). Understanding the nature of the MPI is important in terms of searching for new physics in the products of the scatters, and also in its own right to gain a greater understanding of hadron structure. This book aims at providing a pedagogical introduction and a comprehensive review of different research lines linked by an involvement of MPI phenomena. It is written by pioneers as well as young leading scientists, and reviews both experimental findings and theoretical developments, discussing also the remaining open issues.
Download or read book Determination of the Effective Strong Coupling Constant alpha s G 1 Q 2 from CLAS Spin Structure Function Data written by and published by . This book was released on 2008 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a new extraction of the effective strong coupling constant $\alpha_{s, g_1}(Q^2)$. The result agrees with a previous determination and extends the measurement of the low and high $Q^2$ behavior of $\alpha_{s, g_1}(Q^2)$ that was previously deduced from sum rules. In particular, it experimentally verifies the lack of $Q^2$-dependence of $\alpha_{s, g_1}(Q^2)$ in the low $Q^2$ limit. This fact is necessary for application of the AdS/CFT correspondence to QCD calculations. We provide a physics motivated parameterization of $\alpha_{s, g_1}(Q^2)$ that can equivalently be used to parameterize the $Q^2$-dependence of the generalized Gerasimov-Drell-Hearn and Bjorken sums.
Download or read book QCD the DY process written by Andrea L—pez de Recalde and published by Lulu.com. This book was released on 2018-01-03 with total page 258 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent experiments seem to be ready to answer the question whether QCD be the correct theory of strong interactions at all scales, or just an effective high-energy line of a yet undiscovered theory. With the upgraded Large Hadron Collider, a proton-proton collision will reach the Center of Mass (CoM) energy of 14 TeV per colliding pair. Perturbative QCD will then be tested with the highest precision. In this realm, the present book begins reviewing QCD with the aim to focus on the Drell-Yan process and the experiments conceived to validate it. In doing this the approach will be exclusively perturbative. Non perturbative techniques, such as lattice QCD, QCD sum rules, or concepts like the MIT bag model will not be discussed.
Download or read book Determination of the Strong Coupling Constant Up to Complete Second Order in QCD written by Ren-yuan Zhu and published by . This book was released on 1983 with total page 242 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book QCD at D0 and CDF written by and published by . This book was released on 1995 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Selected recent Quantum Chromodynamics (QCD) results from the D0 and CDF experiments at the Fermilab Tevatron are presented and discussed. The inclusive jet and inclusive triple differential dijet cross sections are compared to next-to-leading order QCD calculations. The sensitivity of the dijet cross section to parton distribution functions (for hadron momentum fractions (approximately) 0.01 to (approximately) 0.4) will constrain the gluon distribution of the proton. Two analyses of dijet production at large rapidity separation are presented. The first analysis tests the contributions of higher order processes to dijet production and can be considered a test of BFKL or GLAP parton evolution. The second analysis yields a strong rapidity gap signal consistent with colorless exchange between the scattered partons. The prompt photon inclusive cross section is consistent with next-to-leading order QCD only at the highest transverse momenta. The discrepancy at lower momenta may be indicative of higher order processes impacting a transverse momentum or ''k{sub T}'' to the partonic interaction. The first measurement of the strong coupling constant from the Tevatron is also presented. The coupling constant can be determined from the ratio of W + 1jet to W + 0jet cross sections and a next-to-leading order QCD calculation.
Download or read book A Short History of Measuring the Strong Coupling Constant alpha s to Complete Second Order of QCD written by Min Chen and published by . This book was released on 1985 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of the QCD Coupling s alpha S written by Siegfried Bethke and published by . This book was released on 2000 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Introduction to High Energy Physics written by Donald H. Perkins and published by Cambridge University Press. This book was released on 2000-04-13 with total page 454 pages. Available in PDF, EPUB and Kindle. Book excerpt: This highly-regarded text provides a comprehensive introduction to modern particle physics. Extensively rewritten and updated, this 4th edition includes developments in elementary particle physics, as well as its connections with cosmology and astrophysics. As in previous editions, the balance between experiment and theory is continually emphasised. The stress is on the phenomenological approach and basic theoretical concepts rather than rigorous mathematical detail. Short descriptions are given of some of the key experiments in the field, and how they have influenced our thinking. Although most of the material is presented in the context of the Standard Model of quarks and leptons, the shortcomings of this model and new physics beyond its compass (such as supersymmetry, neutrino mass and oscillations, GUTs and superstrings) are also discussed. The text includes many problems and a detailed and annotated further reading list.
Download or read book Measuring the QCD Coupling Constant alpha s Inside a Nucleus written by Pervez Hoodbhoy and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book DETERMINATION OF ALPHA S USING ENERGY ENERGY CORRELATION ASYMMETRY AND JET MASS DIFFERENCE AT MARK II SLC STRONG COUPLING CONSTANT ALPHA S written by MOKHTAR ABDALLAH CHMEISSANI and published by . This book was released on 1991 with total page 123 pages. Available in PDF, EPUB and Kindle. Book excerpt: The determination of the strong coupling constant $\alpha\sb s$, using Energy-Energy Correlation Asymmetry and jet mass difference with Mark II data at SLC (91 GeV) is presented.
Download or read book Measurement Of Cap Alpha sub S Strong Fine Structure Constant written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We point out that a number of QCD tests, relatively free of obvious nonperturbative corrections and other theoretical problems, are now available in ee− annihilation. By focusing on these tests, one can see the beginning of a confirmation of the running of the strong-coupling constant predicted by the renormalization group.
Download or read book Foundations of Perturbative QCD written by John Collins and published by Cambridge University Press. This book was released on 2011-04-28 with total page 637 pages. Available in PDF, EPUB and Kindle. Book excerpt: Giving an accurate account of the concepts, theorems and their justification, this book is a systematic treatment of perturbative QCD. It relates the concepts to experimental data, giving strong motivations for the methods. Ideal for graduate students starting their work in high-energy physics, it will also interest experienced researchers.
