MEASUREMENTS of the strong coupling constant and the QCDcColour factors using four-jet observables from hadronic Z decays PDF Download
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Author: A. HEISTER
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Languages : en
Pages : 0
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Author: A. HEISTER
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Category :
Languages : en
Pages : 0
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Author: Sílvia Bravo i Gallart
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Category :
Languages : en
Pages : 135
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Author: Sílvia Bravo i Gallart
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ISBN: 9788469980934
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Languages : en
Pages :
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![Determination of the Strong Coupling Constant ([alpha][sub S] and a Test of Perturbative QCD Using W + Jets Processes in the D0 Detector PDF](https://books.google.com/books/content/images/frontcover/TJeIDAEACAAJ?fife=w80-h100)
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Languages : en
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The D0 experiment has accumulated data for a study of inclusive W production corresponding to a total integrated luminosity of 14.3 [plus-minus] 1.7 pb[sup [minus]1] during the 1992--1993 Fermilab Tevatron collider run. The total number of W [yields] 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 Q[sup 2] = M[sub W][sup 2] is measured to be [alpha][sub s](M[sub W][sup 2]) = 0.124 [plus-minus] 0.005(stat) [plus-minus] 0.006(MC) [plus-minus] 0.008(theory)[sub [minus]0.022][sup +0.026](sys) or ([sub [minus]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.
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Languages : en
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Author:
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ISBN:
Category :
Languages : en
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The ratio of the number of W+ 1 jet to W+ 0 jet events is measured with the D0 detector using data from, the 1992--93 Tevatron Collider run. For the W[yields] e[nu] channel with a minimum jet E[sub T] cutoff of 25 GeV, the experimental ratio is 0.065[+-] 0.003(stat)[+-] 0.007(sys). Next-to-Leading order QCD predictions for various parton distributions agree well with each other and are all over one standard deviation below the measurement. Varying the strong coupling constant[alpha][sub s] in both the parton distributions and the partonic cross sections simultaneously does not remove this discrepancy.
![Determination of the Strong Coupling Constant ([alpha]s) and a Test of Perturbative QCD Using W+ Jets Processes in the DØ Detector PDF](https://books.google.com/books/content/images/frontcover/OKpINwAACAAJ?fife=w80-h100)
Author: Jaehoon Yu
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ISBN:
Category : Coupling constants
Languages : en
Pages : 238
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