Sökning: "elementary particle"

Visar resultat 31 - 35 av 99 avhandlingar innehållade orden elementary particle.

1. 31. Quark Distributions and Charged Higgs Boson Production : Studies of Proton Structure and New Physics

   Författare :Johan Alwall; Gunnar Ingelman; Johan Rathsman; Dieter Zeppenfeld; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Physics; quark distributions; parton density functions; proton structure; strange quark; intrinsic charm; charged Higgs boson; supersymmetry; NuTeV; LHC; parton showers; matrix element; elementary particle physics; Fysik; Physics; Fysik;

   Sammanfattning : The Standard Model describes all elementary particles known today, but at larger energies it will have to be complemented with new particles and interactions. To be able to distinguish new physics at proton colliders such as LHC at CERN, it is essential to have an appropriate description of the colliding protons and their interactions. LÄS MER

3. 32. Phenomenology of Charged Higgs Bosons and B-meson Decays

   Författare :David Eriksson; Johan Rathsman; Gunnar Ingelman; Fabio Maltoni; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Supersymmetry; Beyond Standard Model; B-Physics; Charged Higgs Boson; LHC; QCD; Spin Correlations; CMSSM; NUHM; Elementary particle physics; Elementarpartikelfysik;

   Sammanfattning : For more than 30 years the Standard Model has been the theoretical foundation for particle physics. The theory has been verified successfully by experimental tests. Its biggest shortcoming is the non-discovery of the Higgs boson,responsible for giving the other particles masses. LÄS MER

4. 33. 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

5. 34. Measurement of the Reaction pp→ppπ+π-π0 with CELSIUS/WASA at 1.36 GeV

   Författare :Marek Jacewicz; Sven Kullander; Hans Ströher; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Elementary particle physics; Elementarpartikelfysik; Elementary particle physics; Elementarpartikelfysik;

   Sammanfattning : A versatile detector setup prepared by the CELSIUS/WASA collaboration for exclusive studies of rare processes produced in proton and deuteron collisions with hydrogen and deuterium pellet targets is presented. For the near-threshold production of light mesons, π0 and η, the scattered beam and target particles are measured in the forward detector, while the products of the decaying mesons are registered in a central detector covering close-to-4π sr. LÄS MER

7. 35. Multiparticle Production in Strong Interactions

   Författare :Fredrik Söderberg; Centrum för miljö- och klimatvetenskap (CEC); []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Hadronisation; QCD; Bose-Einstein correlations; Elementary particle physics; Elementarpartikelfysik; quantum field theory; String fragmentation; kvantfältteori; Fysicumarkivet A:2003:Söderberg;

   Sammanfattning : An alternative formulation of the Lund fragmentation model for string states without gluons is presented. It is shown that the fragmentation process can be factorised into a product of transition operators with well-defined eigenfunctions and corresponding eigenvalues. LÄS MER