Determination of the Strong Coupling [alpha]s̳ from Jet Production Rates in Ee− Annihilation at TRISTAN Energies PDF Download
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![Determination of the Strong Coupling [alpha]s̳ from Jet Production Rates in Ee− Annihilation at TRISTAN Energies PDF](https://books.google.com/books/content/images/frontcover/8DbFHgAACAAJ?fife=w150-h200)
Author: YueKuan Li
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Category :
Languages : en
Pages : 250
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![Determination of the Strong Coupling [alpha]s̳ from Jet Production Rates in Ee− Annihilation at TRISTAN Energies PDF](https://books.google.com/books/content/images/frontcover/8DbFHgAACAAJ?fife=w80-h100)
Author: YueKuan Li
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ISBN:
Category :
Languages : en
Pages : 250
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Author:
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Languages : en
Pages :
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The energy dependence of the relative production rate of 3-jet events is studied in hadronic ee− annihilation events at centre of mass energies between 22 and 56 GeV, using the data of the JADE, MARK-II and AMY collaborations at PETRA, PEP and TRISTAN. Three jet events are defined by a jet finding algorithm which is closely related to the definition of resolvable jets used in O(.cap alpha./sub s/2) perturbative QCD calculations, where the relative production rate of 3-jet events is roughly proportional to the strong coupling strength, .cap alpha./sub s/. The observed production rates of 3-jet events decreases significantly with increasing centre of mass energy. The results, which are independent of fragmentation model calculations, can be directly compared to theoretically calculated jet production rates and are in good agreement with the QCD expectations of a running coupling strength, while the hypothesis of an energy independent coupling constant can be excluded with a significance of 5 standard deviations. Based on these results, the presented jet analysis also provides the possibility to detect first signs of the production of new and heavy particles in the early stage of data taking at SLC and LEP.
![Measurement of the Strong Coupling Constant [alpha][subscript S] from Jet Production in W [right Arrow] E[nu] Events PDF](https://books.google.com/books/content/images/frontcover/i7T40bXDgfsC?fife=w80-h100)
Author: Michael Allen Lindgren
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ISBN:
Category : Coupling constants
Languages : en
Pages : 290
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Author: MOKHTAR ABDALLAH CHMEISSANI
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Category :
Languages : en
Pages : 123
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The determination of the strong coupling constant $\alpha\sb s$, using Energy-Energy Correlation Asymmetry and jet mass difference with Mark II data at SLC (91 GeV) is presented.
Author: Marc-André Dufour
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Category :
Languages : en
Pages :
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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.
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Category : Particles (Nuclear physics)
Languages : en
Pages : 570
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Author: Stephan Eisenhardt
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Category :
Languages : en
Pages : 191
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Category :
Languages : en
Pages : 7
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We determine the strong coupling constant [alpha]{sub s} and its energy dependence from the p{sub T} dependence of the inclusive jet cross section in p{bar p} collisions at √s = 1.96 TeV. The strong coupling constant is determined over the transverse momentum range 50
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Languages : en
Pages :
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In this work, a measurement of the strong coupling constant [alpha][sub s] in e[sup +]e[sup [minus]] annihilation at a center-of-mass energy of 91.6 GeV is presented. The measurement was performed with the SLD at the Stanford Linear Collider facility located at the Stanford Linear Accelerator Center in California. The procedure used consisted of measuring the rate of hard gluon radiation from the primary quarks in a sample of 9,878 hadronic events. After defining the asymptotic manifestation of partons as 'jets', various phenomenological models were used to correct for the hadronization process. A value for the QCD scale parameter [Lambda][sub bar MS], defined in the [sub bar MS] renormalization convention with 5 active quark flavors, was then obtained by a direct fit to O([alpha][sub s][sup 2]) calculations. The value of [alpha][sub s] obtained was [alpha][sub s](M[sub z0]) = 0.122 [plus-minus] 0.004 [sub [minus]0.007] [sup +0.008] where the uncertainties are experimental (combined statistical and systematic) and theoretical (systematic) respectively. Equivalently, [Lambda][sub bar MS] = 0.28 [sub [minus]0.10][sup +0.16] GeV where the experimental and theoretical uncertainties have been combined.
![Measurement of the strong coupling constant [alpha tief] s from jet rates in deep inelastic scattering PDF](https://books.google.com/books/content/images/frontcover/HdQVHAAACAAJ?fife=w80-h100)
Author: Richard Nisius
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ISBN:
Category :
Languages : de
Pages : 123
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