This is a compilation of the articles accepted for publication and carried out under the auspices of the HELAS Activity Network. In order to send a preprint accepted for publication, you only need to register as a member of the HELAS Community and fill out the submission form with the title of the article, list of author(s) and a brief summary. Finally, a copy of the paper in PDF or Postscript format should be uploaded. Do not hesitate to contact our web services in case of doubt. Please remember, that if your work has been funded by HELAS Activity Network, the European Commission kindly requests you to include the text shown below, or a similar one, in the acknowledgement section of the papers arising.