Future electron-positron colliders operating above the 100 GeV energy scale with high luminosity, such as the FCC-ee project at CERN, will deliver collision data allowing to study electroweak processes with outstanding accuracy. The statistical power of these facilities is such that current uncertainties in the masses of W bosons or top quarks could be reduced by a factor of 50, for instance!
Exploiting these data at their full potential will require exquisite performance of the detectors. For electromagnetic calorimeters in particular, a ten-fold increase of 3D segmentation coupled with excellent energy and timing resolution is sought for, together with the deployment of sophisticated deep-learning reconstruction and regression techniques able to digest optimally this dense information.
While various novel calorimeter technologies are explored to achieve these ambitious goals, we believe that sampling calorimeters based on liquified noble gases, a cost-effective and well-established approach employed successfully in past experiments (ATLAS, D0...), are also able to meet these demanding criteria.
Our team, with its national (ITIM, UNSTPB) and international collaborators, participates to the joint R&D program launched to design such a calorimeter and demonstrate its suitability for FCC-ee experiments. In these studies, the calorimeter is embedded in a full detector, the Allegro concept, in order to assess its performances in a realistic environment: indeed, the cryostat walls and the sensors of the tracking detectors influence the development of electromagnetic showers inside the calorimeter.
Work package 2
Detector Physics and Electronics Group, DFPE, IFIN-HH
Str. Reactorului 30, Magurele, Romania