Sökning: "String fragmentation"

Visar resultat 6 - 10 av 10 avhandlingar innehållade orden String fragmentation.

  1. 6. Modelling of drill string buckling and tool indentation in rock drilling and fragmentation

    Författare :Xiangchun Tan; Luleå tekniska universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Mining and Rock Engineering; Gruv- och Berganläggningsteknik;

    Sammanfattning : In rock drilling, quality of drill hole and efficiency of drilling are two important aspects of great concern to drill operators and manufacturers. The first part of the thesis deals with the deviation of blast holes. LÄS MER

  3. 7. Properties of Hadronization in e+e- -Annihilation

    Författare :Jari Häkkinen; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; högenergi; colour interferences; strong interactions; QCD; heavy quark fragmentation; MC programs; Kosmisk strålning; cosmic rays; hadronization; High energy interactions; e e- -annihilation; Fysicumarkivet A:1996:Häkkinen;

    Sammanfattning : Possible effects from colour interferences in strong interactions are discussed and investigated, and possible experimental signals in e+e- --> hadrons and e+e- --> W+W- --> hadrons are suggested. The observability of the signals depend on the relative probabilities of the occurrence of interferences, and can provide a measurement of the probabilities. LÄS MER

  4. 8. Developing the Angantyr model and extending colour reconnection for heavy-ion collisions in Pythia

    Författare :Harsh Shah; Partikel- och kärnfysik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; heavy-ion collisions; hadronization; QCD Phenomenology; Colour Reconnection; Fysicumarkivet A:2023:Shah;

    Sammanfattning : This thesis is composed of four papers, the first two show the attempts made to extend the Pythia event generator to simulate heavy-ion collision events. The other two papers show methods to improve the hadronization mechanism in the Pythia model for a bettter agreement with the experimental data of pp and heavy-ion collisions. LÄS MER

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

    Författare :Sandipan Mohanty; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  7. 10. Phenomenological Studies on Supersymmetry and the Strong Force

    Författare :Peter Skands; Teoretisk partikelfysik - Geonomgår omorganisation; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; R-parity violation; Physics; beam remnants; hadronisation; parton showers; underlying event; Supersymmetry; Fysik; QCD; Fysicumarkivet A:2004:Skands;

    Sammanfattning : In this thesis, we first consider the phenomenology of R-parity violating supersymmetric extensions of the Standard Model. Specifically, a large number of Lepton and Baryon Number violating decays of sparticles to particles are implemented in the Pythia event generator. LÄS MER