Speaker
Description
Precision measurements of the Higgs, W/Z bosons at future $e^{+}e^{-}$ colliders pose a stringent requirement on the calorimetry system for unprecedented jet performance. At the Circular Electron Positron Collider (CEPC), one of the Higgs factory options, a new electromagnetic calorimeter has been developed using finely segmented scintillating crystals. The calorimeter is compatible with the particle-flow paradigm and also achieves an optimal EM energy resolution of better than $3\%/\sqrt{\text{GeV}}$ with the homogeneous structure. It consists of multiple longitudinal layers of long crystal bars, with each end individually read out by a silicon photomultiplier. The crystal bars are arranged orthogonally to obtain an effective transverse granularity at the level of $1.5 \times 1.5\text{ cm}^{2}$. Dedicated efforts have been made to study physics performance, optimize the design, and develop a first prototype. The prototype was tested at testbeam facilities using high-energy particles to evaluate its electromagnetic shower performance. This contribution will introduce the crystal calorimeter design and simulation-based performance studies. Highlights of the crystal calorimeter prototype development and beam test results will also be presented.
