Dissertation at Uppsala University to be publicly examined in Polhemsalen, �ngstr�m Laboratory, Friday, September 23, 2005 at 13:15 for the Degree of Doctor of Philosophy. The examination will be conducted in English.

The thesis consists of the collection of papers listed below, and a summary describing the scientific context of the thesis.

Official page including abstract and publication information

The summary (in pdf format with links and cross-references, 984 kB)

Popul�rvetenskaplig sammanfattning p� svenska (pdf, 215 kB)

The thesis is based on the following papers:
1. Johan Alwall and Gunnar Ingelman
  Interpretation of electron-proton scattering at low Q²
  Phys. Lett. B 596 (2004) 77-83, hep-ph/0402248
2. Johan Alwall and Gunnar Ingelman
  Strange quark asymmetry in the nucleon and the NuTeV anomaly
  Phys. Rev. D 70 (2004) 111505, hep-ph/0407364
3. Johan Alwall and Gunnar Ingelman
  Quark asymmetries in the proton from a model for parton densities
  Phys. Rev. D 71 (2005) 094015, hep-ph/0503099
4. Johan Alwall
  Quark asymmetries and intrinsic charm in nucleons
  TSL/ISV-2005-0294 (2005), hep-ph/0508126
  Extended version of "Quark asymmetries in nucleons" in the proc. of XIII International Workshop on Deep Inelastic Scattering, Madison, Wisconsin, 27 April-1 May 2005
5. J. Alwall, C. Biscarat, S. Moretti, J. Rathsman and A. Sopczak
  The p antip -> tbH^+/- process at the Tevatron in Herwig and Pythia simulations
  Eur. Phys. J. C 39 S1 (2004) 37-39, hep-ph/0312301
6. Johan Alwall and Johan Rathsman
  Improved description of charged Higgs boson production at hadron colliders
  JHEP 12 (2004) 050, hep-ph/0409094
7. Johan Alwall
  MATCHIG: A program for matching charged Higgs boson production at hadron colliders
  TSL/ISV-2005-0290 (2005), hep-ph/0503124