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 On the Model Dependence of the Determination of the Strong Coupling Constant in Second Order QCD from E e annihilation Into Hadrons written by CELLO Collaboration and published by . This book was released on 1983 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book On the model dependence of the determination of the strong coupling constant in second order QCD form e 1hn e 1hn ee annihilation into hadrons written by and published by . This book was released on 1983 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Experimental Determination of the Effective Strong Coupling Constant written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We extract an effective strong coupling constant from low Q2 data on the Bjorken sum. Using sum rules, we establish its Q2-behavior over the complete Q2-range. The result is compared to effective coupling constants extracted from different processes and to calculations based on Schwinger-Dyson equations, hadron spectroscopy or lattice QCD. Although the connection between the experimentally extracted effective coupling constant and the calculations is not clear, the results agree surprisingly well.

Download or read book Experimental Determination of an Effective Coupling Constant written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quantum chromodynamics (QCD), the theory of the strong force, describes the interactions of two basic building blocks of matter: quarks and gluons. High precision data taken at the Jefferson Lab electron accelerator provide a solid basis for the detailed study of many aspects of QCD. The accelerator's beam energy permits investigations of the transition between the short distance and long distance regimes of the strong force. Understanding how the descriptions of these regimes are related is essential in comprehending the structure of ordinary matter. Using new data from polarized electron - nucleon scattering, we extract the scale dependence of an effective strong coupling constant, $\alpha_{\rm{s}}^{\rm{eff}}$. Our result shows that this effective charge freezes, i.e. loses its scale dependence, at long (nucleon-size) distances. This finite behavior allows us to obtain a physical coupling constant for the strong interaction that is relevant at all scales.

Download or read book The Strong Coupling Constant of QCD with Four Flavors written by Fatih Tekin and published by . This book was released on 2010 with total page 127 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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 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 A Measurement of the Strong Coupling Constant alpha s to Complete Second Order written by B. Adeva and published by . This book was released on 1986 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book A Measurement of Strong Coupling Constant alpha s to Second Order for 14 less Than Or Equal To square Root S less Than Or Equal To 46 78 GeV written by B. Adeva and published by . This book was released on 1984 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of the Strong Coupling Constant s mZ in Next to next to leading Order QCD Using H1 Jet Cross Section Measurements written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 Comparison of e annihilation with QCD and determination of the strong coupling constant written by and published by . This book was released on 1980 with total page 3 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of Strong coupling Constant alpha s to Second Order for 22 less Than Or Equal To square Root S less Than Or Equal To 46 78 GeV written by B. Adeva and published by . This book was released on 1985 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of the Strong Coupling Constant from Multi jet Production with the ATLAS Detector written by Marc-André Dufour and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The strong coupling constant alpha_S is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV using 38 pb -1 of data recorded by the ATLAS detector. An inclusive jet production ratio distribution is used to reduce parton distribution functions dependence and measure the coupling strength at energy scales between 100 GeV and 1.5 TeV. The value of the strong coupling constant alpha_S(MZ) is measured to be 0.111 +0.016_-0.012, in agreement with similar measurements performed at hadron colliders and the world average value. Results are also consistent with the running of the coupling as predicted by Quantum Chromodynamics, tested for the first time at energy scales greater than 209 GeV.