  Cerium-doped Lutetium-Yttrium Oxyorthosilicate (LYSO:Ce)is one of the most
widely used Cerium-doped Lutetium based scintillation crystals. Initially
developed for medical detectors it rapidly became attractive for High Energy
Particle Physics (HEP) applications, especially in the frame of high luminosity
particle colliders. In this paper, a comprehensive and systematic study of
LYSO:Ce ($[Lu_{(1-x)}Y_x]_2SiO_5$:$Ce$) crystals is presented. It involves for
the first time a large number of crystal samples (180) of the same size from a
dozen of producers.The study consists of a comparative characterization of
LYSO:Ce crystal products available on the market by mechanical, optical and
scintillation measurements and aims specifically, to investigate key parameters
of timing applications for HEP.
