Download or read book A Study of Jet Rates and Measurement of sub S at the Z Resonance written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Jet Rates and Measurement of Alpha Sub S at the Z Sup 0 Resonance written by Jan A. Lauber and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Study of Jet Rates and Measurement of alpha sub S at the Z sup 0 Resonance written by and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment was performed with the SLD detector at the Stanford Linear Accelerator Center. Only charged tracks measured in the central drift chamber were used for the measurement of the jet production rates. The value of the strong coupling [alpha][sub s](M[sub Z][sup o]) is determined from the production rates of jets in hadronic Z[sup 0] decays in e[sup +] e[sup [minus]] annihilations. The relative jet rates are obtained using the JADE-type algorithms. The results are compared with the jet rates obtained from a new jet algorithm proposed by N. Brown et al. called the Durham'' algorithm. The data can be well described by O([alpha][sub s][sup 2]) QCD calculations and by QCD shower model calculations. A fit of the theoretical predictions to the data taken with the SLD yields a value, [alpha][sub s](M[sub Z][sup o]) = 0.120 [plus minus] 0.002(stat.) [plus minus] 0.003(exp.)[sub [minus]0.009][sup +0.011](theor.). The error is dominated by the theoretical uncertainties. The measurement is compared with results from other experiments and it is shown that the value obtained for [alpha][sub s] agrees well with these results and furthermore supports the evidence for the running of the strong coupling, consistent with the non-Abelian nature of QCD. The Stanford Linear Collider (SLC) can deliver partially longitudinally polarized electrons to the interaction point. Jet production rates and values for [alpha][sub s] are calculated both for right-handed and left-handed initial state electrons. All results are consistent with the unpolarized result, as predicted by the Standard Model.
Download or read book A Study of Jet Rates and Measurement Of sub S at the Z Resonance written by and published by . This book was released on 1993 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This experiment was performed with the SLD detector at the Stanford Linear Accelerator Center. Only charged tracks measured in the central drift chamber were used for the measurement of the jet production rates. The value of the strong coupling?{sub s}(M{sub Z}{sup o}) is determined from the production rates of jets in hadronic Z° decays in e e− annihilations. The relative jet rates are obtained using the JADE-type algorithms. The results are compared with the jet rates obtained from a new jet algorithm proposed by N. Brown et al. called the D̀̀urham ̀̀algorithm. The data can be well described by O(?{sub s}2) QCD calculations and by QCD shower model calculations. A fit of the theoretical predictions to the data taken with the SLD yields a value,?{sub s}(M{sub Z}{sup o}) = 0.120 ± 0.002(stat.) ± 0.003(exp.){sub -0.009}{sup +0.011}(theor.). The error is dominated by the theoretical uncertainties. The measurement is compared with results from other experiments and it is shown that the value obtained for?{sub s} agrees well with these results and furthermore supports the evidence for the running of the strong coupling, consistent with the non-Abelian nature of QCD. The Stanford Linear Collider (SLC) can deliver partially longitudinally polarized electrons to the interaction point. Jet production rates and values for?{sub s} are calculated both for right-handed and left-handed initial state electrons. All results are consistent with the unpolarized result, as predicted by the Standard Model.
Download or read book A Study of Jet Rates and Measurement of alpha sub S at the Z Resonance written by and published by . This book was released on 1992 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present jet rates in hadronic decays of Z° bosons measured by the SLD experiment at SLAC. The data are analyzed in terms of the JADE and recently proposed Durham algorithms, and are found to be in agreement with similar measurements by the LEP experiments, and also with the predictions of perturbative QCD and fragmentation Monte Carlo models of hadron production. After correction for hadronization effects the 2, 3 and 4-jet rates are well described by [Omicron]([alpha]{sub s}2) perturbative QCD calculations. From fits to the differential 2-jet distribution the strong coupling [alpha]{sub s}(M{sub Z}) is measured to be [alpha]{sub s}(M{sub Z}) = 0.119 ± 0.002(stat.) ± 0.003(exp.syst.) ± 0.014(theory) (preliminary). The largest contribution to the error arises from the theoretical uncertainty in choosing the QCD renormalization scale.
Download or read book A Study of Jet Rates and Measurement of s at the Z0 Resonance written by Jan A. Lauber and published by . This book was released on 1993 with total page 312 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 376 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Download or read book Measurement of A sub B at the Z Resonance Using a Jet charge Technique written by and published by . This book was released on 1997 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a new preliminary measurement of the parity-violation parameter A{sub b} using a self-calibrating jet-charge technique. In the SLD experiment they observe hadronic decays of Z° bosons produced in collisions between longitudinally polarized electrons and unpolarized positrons a the SLAC Linear Collider. A sample of b{anti b} events is selected using the topologically reconstructed mass of B hadrons. From the 1997--1998 data sample of approximately 200,000 hadronic Z° decays, they obtain A{sub b} = 0.824 " 0.031(stat) " 0.032(syst). Together with the previous 1993--1995 result, it yields a preliminary combined SLD jet-charge measurement of: A{sub b} = 0.849 " 0.026(stat) " 0.031(syst).
Download or read book Proceedings of the 1982 DPF Summer Study on Elementary Particle Physics and Future Facilities written by Rene Donaldson and published by . This book was released on 1982 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of alpha sub S from Hadronic Event Observables at the Z Resonance written by and published by . This book was released on 1994 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have measured the strong coupling [alpha]{sub s} using hadronic decays of Z° bosons collected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O([alpha]{sub s}2), and including resummed analytic formulae based on the leading and next-to-leading logarithm approximation. The study includes event shapes, jet rates, and particle correlations. They checked the consistency between [alpha]{sub s} extracted from these different measures and found the dominant uncertainty on [alpha]{sub s} to be from uncalculated higher order contributions.
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1995-07 with total page 708 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Government reports annual index written by and published by . This book was released on 199? with total page 1828 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of alpha sub S from Hadronic Event Observables at the Z sup 0 Resonance written by and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors have measured the strong coupling [alpha][sub s] using hadronic decays of Z[sup 0] bosons collected by the SLD experiment at SLAC. The data were compared with QCD predictions both at fixed order, O([alpha][sub s][sup 2]), and including resummed analytic formulae based on the leading and next-to-leading logarithm approximation. The study includes event shapes, jet rates, and particle correlations. They checked the consistency between [alpha][sub s] extracted from these different measures and found the dominant uncertainty on [alpha][sub s] to be from uncalculated higher order contributions.
Download or read book Eps High Energy Physics 95 Proceedings Of The International Europhysics Conference written by Catherine Vander Velde and published by World Scientific. This book was released on 1996-05-28 with total page 1042 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book TeV Physics written by Tao Huang and published by CRC Press. This book was released on 1991 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: TeV physics is one of the most interesting and rapidly developing areas of particle physics. This volume highlights current progress at CERN and Fermilab, future programs for the SSC and theoretical developments on WZ physics, as well as the nature of symmetry-breaking forces. A forecast is also ventured on the progress of particle physics in the early part of the next century. Annotation copyrighted by Book News, Inc., Portland, OR
Download or read book High Energy Physics Proceedings Of The 25th International Conference In 2 Volumes written by Kok Khoo Phua and published by World Scientific. This book was released on 1991-07-15 with total page 1583 pages. Available in PDF, EPUB and Kindle. Book excerpt: This proceedings contains the talks delivered at the plenary and parallel sessions. Topics covered include e⁺e⁻ Physics at Z0, String Theory and Theory of Extended Objects, High Energy pp Physics, Non-Accelerator Particle Physics, Conformal Field Theory, e⁺e⁻ Physics below Z⁰, Structure Functions and Deep Inelastic Scattering, Neutrino Physics, Recent Developments in 2-Dimensional Gravity, Lattice Gauge Theory and Computer Simulations, CP Violation , Accelerator Physics, Cosmology and Particle Physics, Interface Between Particle and Condensed Matter Physics, Detector R&D, and Astroparticle Physics.
