Dorota Tomaszewska, Wroclaw University of Science and Technology, Wroclaw, Poland Robin Delhomme, Strasbourg, France Vinicius Silva de Oliveira, DESY, Hamburg Neven Šantić, Institute of Physics, Zagreb, Croatia Grzegorz Kowzan, Nicolaus Copernicus University, Toruń, Poland Yuwei Jin, Radboud University Nijmegen, the Netherlands Arkadiusz Tkacz, Military University of Technology, Warsaw, Poland