Download or read book A Measurement of the Strong Coupling Constant from Jet Analysis at BaBar written by Kelly E. Ford and published by . This book was released on 2001 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Strong Coupling Constant alpha subscript S from Jet Production in W right Arrow E nu Events written by Michael Allen Lindgren and published by . This book was released on 1990 with total page 290 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Strong Coupling Constant from Inclusive Jet Production at the Tevatron Collider written by Christina Mesropian and published by . This book was released on 2000 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 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.

Download or read book Fundamental Interactions Proceedings Of The Nineteenth Lake Louise Winter Institute written by Alan Astbury and published by World Scientific. This book was released on 2005-04-21 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains pedagogical lectures on particle physics, nuclear astrophysics, relativistic heavy ion interactions and gravitational waves. In addition, numerous contributions provide up-to-date information on new experimental results at colliders, underground laboratories and nuclear astrophysics. This combination of pedagogical talks and topical short talks provide a comprehensive amount of information to the researchers.

Download or read book A Study of the Strong Coupling Constant Using W Jets Processes written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of the Strong Coupling Constant alpha s from Jet Rates in Deep Inelastic Scattering written by Richard Nisius and published by . This book was released on 1994 with total page 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 and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of the Strong Coupling Constant in Jet Production at HERA written by Tancredi Carli and published by . This book was released on 1999 with total page 4 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 Evaluation of the Strong Coupling Constant as Using the ATLAS Inclusive Jet Cross section Data written by B. Malaescu and published by . This book was released on 2012 with total page 14 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 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 Measurement of the Strong Coupling Constant Ga Us from Global Event shap Ecays written by ALEPH. and published by . This book was released on 1991 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Precision Determination of the Strong Coupling Constant written by Riccardo Abbate and published by . This book was released on 2012 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis we study the event shapes variable thrust. Event shape variables are observables that characterize the shape of the distribution of the final state particles of a reaction. We take advantage of the formalism of Soft Collinear Effective Theory (SCET), an effective theory of the strong interactions appropriate for describing energetic jets. We give a factorization theorem for the process e+e- to hadrons, valid in the whole range of thrust values. This factorization theorem resums large logarithms at the N3LL accuracy and contains the full O(a) result for the fixed order cross section. In order to be able to describe the whole range of thrust values, we define the profile functions, which are thrust-dependent factorization scales which smoothly interpolate between regions where resummation of large logarithms is important and where it is not. To determine non perturbative effects, we fit renormalon-free nonperturbative matrix elements of operators defined in field theory, Q1. We perform a global analysis to all available thrust data in the tail region, where a two parameter fit to a,(mz) and the first power correction Q1 suffices. We find cr(mz) = 0.1135 i (0.0002)expt ± (0.0005)hadr ± (0.0009)pert, with X2 /dof(= 485) = 0.91, where the displayed 1-sigma errors are the total experimental error, the hadronization uncertainty, and the perturbative theory uncertainty, respectively. Furthermore, we perform a global analysis to all available data on the first moment of the thrust distribution. This analysis is a partially independent check of the tail fit, in fact it probes different regions of the thrust distribution and the analysis of experimental systematic uncertainties was conducted independently with respect to the data for the distribution. We find a,(mz) = 0.1141 i (0.0004)exp ± (0.0014)hadr ± (0.0007)pert with X2/dof(= 45) = 1.33. We also consider pp collisions, in particular the Drell-Yan process. Here we calculate analytically the beam thrust logarithms of the relevant beam functions and of the coefficient function at O(a2). This is a necessary ingredient for the calculation of the nonsingular terms in resummed predictions.

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: