Sökning: "tevatron"

Visar resultat 6 - 10 av 13 avhandlingar innehållade ordet tevatron.

1. 6. Merging Parton Showers and Matrix Elements

   Författare :Nils Lavesson; Teoretisk partikelfysik - Geonomgår omorganisation; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Parton Model; QCD Phenomenology; Phenomenological Models; QCD; Jets;

   Sammanfattning : This thesis considers models for describing high energy particle collisions. Existing phenomonological models are modified and new implementations made in order to achive a better description of states with several hard jets. To predict final state hadrons, parton showers are used together with pheonomenological hadronization models. LÄS MER

3. 7. Quantum chromodynamics and colour singlet exchange in high energy interactions

   Författare :Rikard Enberg; Gunnar Ingelman; W. James Stirling; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik; Physics; Fysik; Fysik; Physics;

   Sammanfattning : Quantum chromodynamics (QCD) is the fundamental theory in elementary particle physics that describes the strong interaction in terms of exchanges of force-carrying, colour-charged particles known as gluons. Although well-established through experimental verifications, there are fundamental unsolved problems in the theory. LÄS MER

4. 8. Studies of Heavy Baryons in DELPHI and Radiation Monitoring in DØ

   Författare :Lisa Berntzon; Barbro Åsman; Torbjörn Moa; Hans-Åke Gustafsson; Stockholms universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; high energy physics; baryons; Physics; Fysik;

   Sammanfattning : Between the years 1992 and 1995 about 3.5 million hadronic Z decays were collected by the DELPHI detector at CERN. This data has been used to measure the production and lifetime of the beauty strange baryon Ξb,in the inclusive decay channel Ξb →Ξ-ℓ- X. LÄS MER

5. 9. First determination of the electric charge of the top quark

   Författare :Per Hansson; Bengt Lund-Jensen; Peter Hansen; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; Fysik;

   Sammanfattning : In this thesis, the first determination of the electric charge of the top quark is presented using 370pb-1 of data recorded by the DØ detector at the Fermilab Tevatron accelerator. ttbar events are selected with one isolated electron or muon and at least four jets out of which two are b-tagged by reconstruction of a secondary decay vertex (SVT). LÄS MER

7. 10. Improving Parton Showers with Fixed Order Matrix Elements

   Författare :Stefan Prestel; Teoretisk partikelfysik - Geonomgår omorganisation; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Matrix Element Merging; Parton Shower; QCD; Phenomenology; Fysicumarkivet A:2013:Prestel;

   Sammanfattning : This thesis considers numerical simulations of high energy particle collisions, and improvements in the description of multiple collimated jets of hadrons in collision events in particular. In the event simulation software called event generators, the structure of multi-jet events is determined through an interplay of the input calculation, parton showers and phenomenological hadronisation models. LÄS MER