LEMURS: Large-scale multi-detector ElectroMagnetic Universal Representation of Showers

The LEMURS dataset is described in details in arXiv:2509.05108. Photon (gamma) showers are presented, developping in 5 different electromagnetic detectors (Par04SiW, Par04SciPb, ODD, FCCeeCLD, FCCeeALLEGRO) using custom scoring mechanism (Universal Representation of Showers) . Nearly 1M showers per detector are simulated in a Universal Representation, which was implemented first in Par04 extended example of Geant4, and used also by dataset 2 of CaloChallenge. A file structure is slightly changed with respect to CaloChallenge files. Wide range of energies and angles are provided. Energy range differs for experiments on electron-positron colliders (FCCee*, up to 100 GeV) and for hadron colliders (Par04* and ODD, up to 1 TeV). For each of the five detectors 10 HDF5 (.h5) files are provided for the main/training dataset (up to 100k per file), and a zip archive with 8 files per detector for the smaller testing (discrete) datasets. Training files are not grouped in an archive as they are large and we wanted users to have the flexibility to choose the number of events they download. Each HDF5 files contains following structure: Dataset name Shape Description incident_energy (S) Incident particle energy incident_phi (S) Incident azimuthal angle incident_theta (S) Incident polar angle showers (S,R,Phi,Z) Showers in Unified Representation Grid Validation plots (at least one per file) are included in the publication. Additionally to the dataset training and testing files, LEMURS logo is provided (logo.zip) and can be used when presenting results or referencing the dataset to facilitate recognition.LEMURS数据集的详细说明已发表于arXiv:2509.05108。 本数据集包含在5款不同电磁量能器（Par04SiW、Par04SciPb、ODD、FCCeeCLD、FCCeeALLEGRO）中发展形成的光子（伽马）簇射，采用自定义计分机制——簇射统一表征（Universal Representation of Showers）。 每款探测器均模拟了近百万次簇射，数据采用统一表征格式。该表征方案首先在Geant4的Par04扩展示例中实现，同时也被CaloChallenge的数据集2所采用。相较于CaloChallenge的数据集文件，本次数据集的文件结构略有调整。 数据集覆盖了宽泛的能量与入射角度范围，其中正负电子对撞机实验（FCCee系列，最高能量100 GeV）与强子对撞机实验（Par04系列与ODD，最高能量1 TeV）的能量区间存在差异。 针对5款探测器，主训练数据集各提供10个HDF5（.h5）文件（单文件最多包含10万条事件）；同时为每款探测器提供一个压缩归档，内含8个文件，用于规模较小的测试（离散）数据集。由于训练文件体积较大，未将其打包为统一归档，以便用户灵活选择所需下载的事件数量。 每个HDF5文件包含以下数据结构： | 数据集名称 | 维度 | 描述 | | --- | --- | --- | | incident_energy | (S) | 入射粒子能量 | | incident_phi | (S) | 入射方位角 | | incident_theta | (S) | 入射极角 | | showers | (S,R,Φ,Z) | 统一表征网格中的簇射 | 本论文中包含了验证绘图（每个文件至少一张）。 除训练与测试数据集文件外，本次还提供LEMURS标识（logo.zip），可在展示研究成果或引用该数据集时使用，以提升辨识度。