Precision Timing Calorimeter for High Energy Physics

We present studies on the performance and characterization of the time resolution of LYSO-based calorimeters. Results for an LYSO sampling calorimeter and an LYSO-tungsten Shashlik calorimeter are presented. We demonstrate that a time resolution of 30 ps is achievable for the LYSO sampling calorimeter. We discuss timing calorimetry as a tool for mitigating the effects due to the large number of simultaneous interactions in the high luminosity environment foreseen for the Large Hadron Collider.