Search for dissertations about: "PARTON"

Showing result 1 - 5 of 26 swedish dissertations containing the word PARTON.

  2. 1. Merging Parton Showers and Matrix Elements

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

    Abstract : 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. READ MORE

  4. 2. Multiplet bases, recursion relations and full color parton showers

    Author : Johan Thorén; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; QCD; Multiplet Bases; SU Nc ; SU N ; Recursion Relations; BCFW; Nc=3 Parton Showers; Parton Showers;

    Abstract : The papers in this thesis all concern the treatment of colors in perturbative QCD, both in the context of hard scattering cross sections and for parton showers. The complexity of the color structure of QCD increases quickly with the number of external partons. READ MORE

  5. 3. Multiparton Interaction Models and Parton Shower Studies

    Author : Richard Corke; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Multiparton Interactions; Parton Showers; Phenomenological Models; QCD Phenomenology;

    Abstract : This thesis involves phenomenological models for describing high energy particle collisions. One class of these models, multiparton interactions (MPI), deals with the fact that when colliding two hadrons, it is possible for more than one pair of their constituents to interact. READ MORE

  6. 4. Improving Parton Showers with Fixed Order Matrix Elements

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

    Abstract : 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. READ MORE

  7. 5. Parton Cascades and Hadronisation in High Energy Processes

    Author : Sandipan Mohanty; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; small invariant mass hadronic systems; hadronisation; parton cascades; Elementary particle physics; Elementarpartikelfysik; kvantfältteori; quantum field theory; Bose-Einstein correlations; Fysicumarkivet A:2003:Mohanty;

    Abstract : The Lund string fagmentation model was reformulated as a process along the boundary curve of the string called the directrix, in order to treat multigluon strings according to the Lund model area law. It was found that the hadrons in the final state could be collected into several groups, in such a way that the energy-momenta of the hadrons in a group lie in a plane in the Minkowski space within small transverse fluctuations. READ MORE