Longitudinal and lateral electromagnetic shower shapes for a highly granular crystal electromagnetic calorimeter were studied by fitting published shower profile models using experimental data from a 2025 testbeam experiment performed at the Proton Synchrotron (PS) at CERN, on an event-by-event basis. Values for the radiation length, critical energy, and Molière radius were extracted from the...
A drift chamber(DC)-based design has been chosen and done as a possible alternative to the TPC, in order to contribute its PID performance in the CEPC reference detector’s design [1].
One hand is to study and optimize the resolution of d𝑁/d𝑥 with the advanced electronics and the multilayer DC prototype .Thanks to the nice collaboration with the Italian group, after the study of the simulation...
Future electron-positron colliders, such as CEPC, FCC-ee, and ILC, are being proposed for precision studies of the Higgs boson, electroweak physics, and flavor physics. These ambitious physics programs require excellent particle identification (PID) over a wide momentum range. The Time Projection Chamber (TPC), with its low material budget and excellent tracking capabilities, is the baseline...
A proposal for the CEPC ECAL is a highly granular scintillating crystal design that uses SiPMs to measure physics signals from photons. The potential to develop particle identification methods using deep and traditional machine learning is explored. A contrastive learning technique was demonstrated to enable the separation of showering and ‘punch-through’ pions without explicit labels. A...
Flavor physics and jet measurements at the Circular Electron Positron Collider (CEPC) impose stringent requirements on particle identification (PID). The drift chamber is a key candidate for the tracker, and primary ionization cluster counting (dN/dx) offers superior PID by resolving individual ionization clusters. Simulations indicate that an optimized dN/dx drift chamber can achieve K/π...
The Stereo ECal consists of elongated scintillator strips arranged at alternating stereo angles in adjacent layers. This configuration provides three-dimensional spatial information while limiting the number of readout channels, making it a candidate design for a highly granular calorimeter at the CEPC. In this study, the spatial and angular reconstruction performance of a six-layer Stereo...
High-granularity electromagnetic calorimeters employing long scintillator bars have attracted increasing interest for future collider experiments. Compared with conventional BGO crystals, BSO provides a promising alternative due to its faster scintillation decay time and cost advantage, making it a potential candidate for future ECAL applications.
In this work, we present a systematic...
Scintillating glass is a promising active material for the AGORA high-granularity calorimeter concept for future electron–positron colliders, owing to its high density, potentially high light yield, relatively low cost, and feasibility for large-scale fabrication. As part of the detector R&D program, we perform systematic laboratory characterization of scintillating-glass samples using...
Yttrium-doped barium fluoride (BaF2:Y) is attractive for high-rate radiation detection because Y doping suppresses the slow self-trapped-exciton emission while retaining the ultrafast core-valence luminescence of BaF2. Its practical use, however, requires both scalable crystal growth and control of position-dependent light collection. We address these requirements through two complementary...
Conventional semiconductor-based energy-dispersive spectrometers offer high detection efficiency but relatively limited energy resolution, whereas crystal-based wavelength-dispersive spectrometers can achieve excellent energy resolution at the cost of collection efficiency and simultaneous spectral coverage. Transition-edge sensor (TES) microcalorimeters can combine high energy resolution,...
Accurate jet energy reconstruction is essential for precision studies of hadronic Higgs, W, and Z boson decays at the Circular Electron Positron Collider (CEPC). The CEPC Reference Detector Technical Design Report reports a baseline jet energy resolution of approximately 4.5–5.0% for light-quark jets in the barrel region. Building on this benchmark, this study explores machine learning to...
All-inorganic CsPbBr3 single crystals are promising for X/γ-ray detection owing to their excellent carrier transport properties and room-temperature detection capability. However, processing-induced surface damage and bulk impurities can compromise device performance, and their effects on carrier transport and γ-ray detection remain to be systematically clarified. Herein, surface-state...
Barium fluoride (BaF2) is a classic ultrafast scintillator with a sub-nanosecond fast component. Following our group's demonstration that yttrium (Y) doping effectively suppresses its intrinsic slow component, systematic investigations of the concentration-dependent scintillation performance and radiation tolerance are needed to guide its application in high-energy physics detectors. Here,...
