Download or read book Determination of alpha sub S M sub Z 2 from Hadronic Event Shape Observables in Ee Annihilation written by and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important tasks in high energy physics is the precise determination of the strong coupling [alpha]{sub s}(M{sub Z}2). Not only does measurement of [alpha]{sub s}(M{sub Z}2) in different hard processes and at different hard scales Q provide a fundamental test of the theory of strong interactions, Quantum Chromodynamics (QCD), but it also allows constraints on extensions to the Standard Model of elementary particles. Here, the determination of [alpha]{sub s}(M{sub Z}2) using O([alpha]{sub s}2) calculations of hadronic event shape observables in ee− annihilation is reviewed. The large scatter among [alpha]{sub s}(M{sub Z}2) values determined from different observables may be interpreted as arising from the effect of uncalculated higher-order contributions. The application of optimized perturbation theory and Pade approximants in an attempt to reduce this effect is discussed.

Download or read book Determination Of alpha sub S M sub Z sup 2 from Hadronic Event Shape Observables in E sup e sup minus Annihilation written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most important tasks in high energy physics is the precise determination of the strong coupling[alpha][sub s](M[sub Z][sup 2]). Not only does measurement of[alpha][sub s](M[sub Z][sup 2]) in different hard processes and at different hard scales Q provide a fundamental test of the theory of strong interactions, Quantum Chromodynamics (QCD), but it also allows constraints on extensions to the Standard Model of elementary particles. Here, the determination of[alpha][sub s](M[sub Z][sup 2]) using O([alpha][sub s][sup 2]) calculations of hadronic event shape observables in e[sup+]e[sup[minus]] annihilation is reviewed. The large scatter among[alpha][sub s](M[sub Z][sup 2]) values determined from different observables may be interpreted as arising from the effect of uncalculated higher-order contributions. The application of optimized perturbation theory and Pade approximants in an attempt to reduce this effect is discussed.

Download or read book Measurements of alpha S in E E Annihilation s written by I. Adachi and published by . This book was released on 1989 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Measurement of alpha sub S in Ee Annihilation at E sub Cm written by and published by . This book was released on 1994 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of the strong coupling constant [alpha]{sub s} using the event-shape variable y3 (the differential two-jet rate) in the reaction ee− 2!hadrons is presented. The analysis is based on data from the TPC/Two-Gamma detector at the PEP e+e− storage ring taken between 1984 and 1986 at a center-of-mass energy of E{sub cm} = 29 GeV. A value of [alpha]{sub s}(29 GeV) = 0.160 ± 0.012 is obtained, where the error is the quadratic sum of experimental and theoretical uncertainties. The procedure for determining [alpha]{sub s} is the same as that used by the ALEPH and TOPAZ experiments, which allows for a consistent comparison of the [alpha]{sub s} values obtained at different center-of-mass energies. The observed energy dependence {open_quotes}running{close_quotes} of [alpha]{sub s} is found to be in good agreement with the QCD prediction, and is clearly incompatible with a constant value.

Download or read book Measurement of alpha s from Energy energy Correlations in Ee Annihilation at 29 GeV written by Hsiao-Ying Chao and published by . This book was released on 1990 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of alpha s s and sin2Hw sinw from measurements of the total hadronic cross section in e e ee annihilation written by Deutsches Elektronen-Synchrotron (Hamburg) and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Alpha sub S from Energy energy Correlations in Ee Annihilation at 29 GeV written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied the energy-energy correlation in ee− annihilation into hadrons at .sqrt.s = 29 GeV using the Mark II detector at PEP. We find to O(.cap alpha./sub s/2) that .cap alpha./sub s/ = 0.158 +- 003 +- 008 if hadronization is described by string fragmentation. Independent fragmentation schemes give .cap alpha./sub s/ = .10 - 14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well.

Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995 with total page 802 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Department of Transportation Budget Program Analysis of Fiscal Year 1977 DOT Program by Policy and RD D Management Objectives Program Levels for Fiscal Years 1975 1976 1977 written by and published by . This book was released on 1976 with total page 212 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Prospects for the Precision Measurement of alpha sub S written by and published by . This book was released on 1996 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The prospects for the measurement of the strong coupling constant [alpha]{sub MS}(M{sub Z}) to a relative uncertainty of 1 % are discussed. Particular emphasis is placed on the implications relating to future High Energy Physics facilities.

Download or read book Energy Research Abstracts written by and published by . This book was released on 1989 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 994 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Order alpha s2 s two jet cross section in e e ee annihilation written by Bodo Lampe and published by . This book was released on 1985 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of Alpha written by and published by . This book was released on 1987 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We have studied the energy-energy correlation in ee− annihilation into hadrons at .sqrt.s = 29 GeV using the Mark II detector at PEP. We find to O(.cap alpha./sub s/2) that .cap alpha./sub s/ = 0.158 +- 003 +- 008 if hadronization is described by string fragmentation. Independent fragmentation schemes give .cap alpha./sub s/ = .10 - 14, and give poor agreement with the data. A leading-log shower fragmentation model is found to describe the data well.

Download or read book The Determination of alpha S in E E Annihilation written by G. Wolf and published by . This book was released on 1983 with total page 37 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Determination of alpha subscript S and Sin2 theta w from Measurements of the Total Hadronic Cross Section in E e Annihilation written by CELLO Collaboration and published by . This book was released on 1986 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Accessions of Unlimited Distribution Reports written by and published by . This book was released on 1972-12 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: