2025 European Edition of the International Workshop on the Circular Electron-Positron Collider (CEPC), Barcelona, Spain
UPF
Barcelona, Spain
The 2025 European Edition of the International Workshop on the Circular Electron-Positron Collider (CEPC) will take place in Barcelona, Spain, June 16th to 19th.
The workshop aims at gathering scientists from Europe and around the world to pursue international collaborations for the study of the physics potentials of the CEPC and accelerator and detector optimization, deepen R&D work on critical technologies for future machines and experiments, and develop plans towards an Engineering Design Report (EDR) for the CEPC accelerator and a Technical Design Report (TDR) for a reference detector.
The workshop program consists of plenary sessions and parallel sessions. They will cover: Physics, Accelerator, Detectors, Computing, Tools and Performance developments relevant for the future colliders.The workshop encourages participation from early career scientists, especially from post-graduate students and postdocs.
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Registration UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Plenary Auditorio
Auditorio
Convener: Joao Guimaraes da Costa (Institute of High Energy Physics, Chinese Academy of Sciences)-
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Welcome to the WorkshopSpeaker: Sebastian Grinstein (IFAE/ICREA)
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Welcome and Introduction to IFAE from the DirectorSpeaker: Eugenio Coccia
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CEPC Accelerator: EDR Status and BeyondSpeaker: Jie Gao
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11:00 AM
Group Photo and Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Plenary Auditorio
Auditorio
Convener: Aurelio Juste (ICREA/IFAE)-
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FCC Accelerator and PhysicsSpeaker: Alain Blondel (DPNC Université de Genève)
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Construction of large infrastructure projectsSpeaker: Yifang Wang
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1:00 PM
Lunch Break
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Accelerator: 1 Aula 207-208
Aula 207-208
Convener: Jie Gao-
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Summary of eeFACT2025 and perspective for future e+e- circular colliderSpeaker: Yoshihiro Funakoshi (KEK)
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CEPC collider ring lattice studies in EDRSpeaker: Yiwei Wang (IHEP)
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Luminosity monitoring and IP beam tuningSpeaker: Philip Bambade ( IJClab)
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CEPC collective effects on luminosities including collimators in EDR (remotely)Speaker: Na Wang (IHEP)
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CEPC booster and damping ring studies in EDRSpeaker: Dou Wang (IHEP)
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10
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Detector: Silicon tracking detectors Auditorio
Auditorio
Conveners: Harald Fox, Hongbo Zhu- 16
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CEPC silicon inner tracker and timing layer detector R&D (remotely)Speaker: Yan Qi (IHEP)
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FCC-ee Silicon Tracking Detector OverviewSpeaker: Attilio Andreazza (Università di Milano and INFN)
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Hightlights of DRD3.2 Hybrid Technologies Working GroupSpeaker: Leena Diehl (CERN)
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4D LGAD Technologies and their Potential Applications in Future Lepton Colliders (remotely)Speaker: Matteo Centis Vignali (FBK)
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Physics: Theoretical calculations and tools for high-precision e+e- colliders Aula 201-202
Aula 201-202
Convener: Juergen Reuter (Deutsches Elektronen-Synchroton DESY)- 22
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High-precision calculations at e+e- colliders with MC@NLO and lepton PDFsSpeaker: Giovanni Stagnitto
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Feynman integral evaluation for 2- and 3-loop EW corrections with SeaSydeSpeaker: Tommaso Armadillo
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4:30 PM
Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Accelerator: 2 Aula 207-208
Aula 207-208
Convener: Frank Zimmermann-
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Accelerator international collaborations in IN2p3/CNRS (remotely)Speaker: Angeles Faus-Golfe (IJCLab)
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CEPC collider ring and booster magnets in EDR and industrial fabrication preparationSpeaker: Wen Kang
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CEPC vacuum system and mass production preparation studies in EDRSpeaker: Yongsheng Ma (IHEP)
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L-band cavity BPM tests and its application to CEPCSpeaker: Soohyung Lee
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Investigation on injection related beam loss at super KEK BSpeaker: Meng Li
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Detector: Gaseous Detectors Auditorio
Auditorio
Convener: Mary-Cruz Fouz-
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CEPC TPCSpeaker: Huirong Qi (Institute of High Energy Physics,CAS)
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Drift ChamberSpeaker: Mr Francesco Massimiliano Procacci (INFN Bari (Italy))
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Muon gas detector : (M)RPCSpeaker: Yi Wang
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PICOSEC Micromegas: A Scalable Solution for Precise Timing ApplicationsSpeaker: Alexandra Kallitsopoulou (CEA/IRFU/DEDIP/Université Paris-Saclay)
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NSW MPGDSpeaker: Ralf Hertenberger (LMU Muenchen Fakultaet fuer Physik)
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Physics: Higgs Aula 201-202
Aula 201-202
Convener: Kirill Prokofiev- 39
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Status of Higgs theory predictions at e+e- collidersSpeaker: Juergen Reuter (Deutsches Elektronen-Synchroton DESY)
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Higgs to diphoton and photon performance at CEPCSpeaker: Mohamed Reda Mekouar
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Accelerator: 3 Aula 207-208
Aula 207-208
Convener: Manuela Boscolo (INFN/LNF)-
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Recent Development of SRF Technologies Worldwide: Highlights from TTC2025 meeting at IRIS/IBS Korea (remotely)Speaker: Eiji Kako (KEK)
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CEPC cryogenic system optimization in EDRSpeaker: Rui Ge (IHEP,CAS)
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CEPC linac injector development in EDRSpeaker: Jingru Zhang (IHEP)
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High efficiency and high power klystron development in P-band and C-band in EDRSpeaker: Zusheng Zhou (Institute of High Energy Physics(IHEP))
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Detector: Infrastructure, System Integration (Mechanics, Magnet) Auditorio
Auditorio
Conveners: Fabrizio Palla , Xiaoyan Ma-
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Mechanics of CEPC Calorimeter and MagnetSpeaker: Yatian Pei
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CEPC detector Installation and IntegrationSpeaker: Quan Ji
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ALICE ITS3 system integration and infrastructure considerations for ALICE 3Speakers: Jian Liu, Jian Liu (University of Liverpool)
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Alignment of the Interaction Region at FCC-ee (remotely)Speaker: Leonard Watrelot
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Physics: Electroweak, QCD and Top Aula 201-202
Aula 201-202
Convener: Matthias Schott-
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EW Physics at the CEPC: White Paper Studies and recent progressSpeaker: Hengne Li (South China Normal University)
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Effective leptonic weak mixing angle determination at the Z resonanceSpeaker: Fulvio Piccinini
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Verifying the resonance schemes of unstable particles at lepton collidersSpeaker: Ui Min
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Connecting scales: RGE effects in the SMEFT at the LHC and future colliders (remotely)Speaker: Alejo Rossia
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The TeraZ mirage: new physics lost in blind directions (remotely)Speaker: Juan Carlos Criado
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10:40 AM
Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Accelerator: 4 Aula 207-208
Aula 207-208
Convener: Wei Lu (IHEP)-
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CEPC advanced instrumentation and feedback studies in EDR (remotely)Speaker: Yanfeng SUI (IHEP)
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Beam diagnostics for FCCee (remotely)Speaker: Emily Howling (Univ. of Oxford (GB))
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CEPC large scale and precision control system study in EDR (remotely)Speaker: Dapeng Jin (IHEP)
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CEPC mechanical system development status in EDR (remotely)Speaker: Haijing Wang (IHEP)
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CEPC large scale measurement, precision alignment and efficient installation studies in EDR (remotely)Speaker: xiaolong wang
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Detector: TDAQ/Electronics Auditorio
Auditorio
Convener: Jingbo Ye-
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Readout Electronics for the CEPC Reference Detector
The Electronics system of the CEPC reference detector has completed the design of the overall framework based on background simulation and the baseline readout electronics design of the sub-detectors. We will implement the overall design of the Electronics-TDAQ system based on a common backend electronics and a common trigger system design. The framework design of the front-end electronics system will be realized based on a common data-fiber interface and a common radiation-hard power module. Furthermore, based on the baseline schemes of each sub-detector system, a targeted front-end electronics design has been proposed, which will implement a front-end triggerless, full backend trigger architecture. This talk will introduce the design considerations of the CEPC Electronics-TDAQ system, the common electronics framework, and the recent main related R&D efforts.
Speaker: Wei Wei -
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CEPC Detector Readout Trigger System
The Circular Electron-Positron Collider (CEPC) is a next-generation particle collider designed for precision measurements and searches for new physics. An essential component of this experiment is the trigger system, which will select important events from the vast amount of data. This presentation will cover the study of the CEPC trigger system, including the baseline trigger system design scheme, which consists of a two-level trigger system: the first level hardware trigger and high level trigger. This talk will also present the current trigger simulation results, including the trigger algorithm and the event rate estimation.
Speaker: Boping Chen (IHEP) -
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CEPC Detector Data Acquisition System
This report outlines the design plans for the CEPC detector data acquisition system. Firstly, it describes the RADAR data flow framework, which aims to implement a high-performance and flexible data acquisition platform based on experience from previous experiments. Exploration of heterogeneous acceleration methods is underway to optimize future online data processing capabilities. Additionally, the design of online service software will enhance system stability and provide practical monitoring and management tools for DAQ users.
The report will also cover the conceptual design of the Experiment Control System (ECS). As a centralized management platform, ECS plans to integrate subsystems such as DAQ and DCS, and introduce AI technologies for intelligent monitoring and anomaly diagnosis, thereby supporting safe and efficient experiment operations.
Speaker: Xiaolu Ji (Institute of High Energy Physics, Chinese Academy of Sciences) -
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Determination of the Fluxes in the ILD calorimeters at the Circular Colliders
The detector based on Particle Flow require highly granular calorimeters posing many challenges in their implementation. Specifically, their electronics must be embedded, and the scaling of the DAQ and cooling systems must be adequately scaled. Using the CaloFlux tool, based on full simulation of the main processes and machine backgrounds, we can estimate the flux of hits in section of the calorimeter system; from there the data and heat production under various assumptions on the electronics can be assessed. This will be illustrated for the ILD detector; extensions to other detector will be discussed.
Speaker: Vincent Boudry (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris) -
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DRD7: status and plans
The DRD7 (Detector R&D) collaboration, anchored at CERN, unites numerous international research institutes and laboratories to push the boundaries of particle detection technology. This collaboration brings together expertise from fields such as particle physics, electronics engineering, and materials science to develop cutting-edge detectors needed for next-generation experiments in high-energy physics. The goal of DRD7 is to strengthen research partnerships, pool
resources, and drive technological advancements that will help tackle
the challenges of future scientific experiments. By adopting open development practices and facilitating the sharing of intellectual property, DRD7 enhances the efficiency and capability of all participants. The work is organized into several work packages, each targeting specific technical goals and aligning with the strategic recommendations of the Roadmap. Additionally, efforts are underway to establish common standards and approaches for electronics, which will
support the broader DRD program.Speaker: David Gascon
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Physics: Flavour Aula 201-202
Aula 201-202
Convener: Hengne Li (South China Normal University)-
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Status of CEPC Flavor Physics Studies: White Paper & recent progressSpeaker: Manqi RUAN (IHEP)
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Measuring charged-current leptonic B decays and CKM matrix elements (remotely)Speaker: Marco Fedele
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Prospect for measurement of CP-violating observables in B0s→D∓sK± decays at a future Z factorySpeaker: Ji Peng (IHEP)
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Implications of a Tera-Z machine for "flavored" new physics (remotely)Speaker: Claudia Cornella
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Prospects for semileptonic B decays, LFU tests, and LFV at LHCbSpeaker: Ricardo Vazquez Gomez
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12:50 PM
Lunch Break
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Accelerator: 5 Aula 207-208
Aula 207-208
Convener: Concepción Oliver (CIEMAT )-
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Status of Alba light source accelerator activities in SpainSpeaker: Caterina Biscari (ALBA Synchrotron)
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CEPC SC CCT quadrupole design and development in EDR (remotely)Speaker: Yingshu Zhu (IHEP)
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Comparison of Capture Systems Using Flux Concentrator and HTS Solenoid for the FCC-ee Positron Source (remotely)Speaker: Yuting WANG (IJCLab-CNRS)
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IBS and High field HTS SC magnets study statusSpeaker: Qingjin Xu (IHEP)
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CEPC machine protection and radiation environment studies in EDRSpeaker: Guangyi Tang (IHEP, CAS, China)
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Detector: Calorimeter Auditorio
Auditorio
Conveners: Haijun Yang, Vincent Boudry (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris)- 80
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The status of the GS-HCAL (CEPC hadronic calorimeter)Speaker: Hengne Li (South China Normal University)
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SiW-ECAL & Sc-ECALSpeaker: Vincent Boudry (LLR – CNRS, École polytechnique, Institut Polytechnique de Paris)
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Dual readout calorimetry for the IDEA detector conceptSpeaker: Romualdo Santoro
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Physics: BSM Aula 201-202
Aula 201-202
Convener: Tamara Vazquez Schroeder- 87
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Heavy neutral Leptons at CEPCSpeaker: Juergen Reuter (Deutsches Elektronen-Synchroton DESY)
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Physics opportunities for light BSM Higgs bosons at e+e- collidersSpeaker: Andreas Crivellin
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Potential search for direct slepton pair production in sqrt(s)=360 GeV at CEPC (remotely)Speaker: Jiarong Yuan
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4:20 PM
Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Accelerator: 6 Aula 207-208
Aula 207-208
Convener: Angeles Faus-Golfe (IJCLab)- 93
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Positron acceleration in plasma acceleratorSpeaker: Wei Lu (IHEP)
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IHEP plasma accelerator test facility development statusSpeaker: Dazhang Li (IHEP)
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CEPC polarization studies in EDRSpeaker: Zhe Duan (Institute of High Energy Physics, CAS)
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Monochromization studies for FCCee (remotely)Speaker: Anna Korsun (IJCLab)
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CEPC green accelerator technology development (remotely)Speaker: Jinshu Huang (IHEP)
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Joint Simulation and Software session with detector group Auditorio
Auditorio
Convener: Manqi RUAN (IHEP)- 99
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Full simulation of the IDEA detector (remotely)Speaker: Armin Ilg
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Simulation and tracking for the reference detectorSpeaker: Tao Lin (IHEP)
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CyberPFA for the CEPC reference detectorSpeaker: Sheng-Sen Sun (Institute of High Energy Physics, Chinese Academy of Sciences)
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Trilogy of event reconstruction at the future Higgs factorySpeaker: Manqi RUAN (IHEP)
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8:00 PM
Social Event: Gala Dinner Flamant Restaurant
Flamant Restaurant
Carrer d'Enric Granados, 23, L'Eixample, 08007 Barcelona
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Joint Session on MDI Auditorio
Auditorio
Convener: Maria Enrica Biagini- 105
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Study Status of Beam Induced Background at the CEPCSpeaker: Haoyu Shi
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The coherent bremsstrahlung at the CEPCSpeaker: Krzysztof Piotrzkowski (AGH University)
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108
FCCee MDI study progress status update (remotely)Speaker: Andrea Ciarma
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FCC-ee HTS CCT magnet design proposal for the last final focus quadrupole and its cooled beam pipe (remotely)Speakers: Matthieu Marchand (LAPP), Matthieu Marchand (LAPP - IN2P3 - CNRS)
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Collimation studies for future circular colliders (remotely)Speaker: Giacomo Broggi (CERN)
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Physics: Electroweak, QCD and Top Aula 201-202
Aula 201-202
Convener: Andreas Crivellin-
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Top mass, width and Yukawa coupling (remotely)Speaker: Matteo Defranchis
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112
Thrust distribution in electron-positron annihilation at full NNNLL+NNLO (and beyond) in QCDSpeaker: Giancarlo Ferrera
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Luminosity measurements and monitoring at CEPCSpeaker: Lei Zhang (Nanjing University (CN))
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Physics with the Large Hadron electron Collider LHeCSpeaker: Armesto Perez
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11:00 AM
Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Plenary Auditorio
Auditorio
Convener: William John Murray-
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Keynote physics: Why are these projects interesting?Speaker: Andrea Wulzer (ICREA@IFAE)
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Panel Discussion
Moderator: Geoffrey Taylor
Speakers: Alain Blondel (DPNC Université de Genève), Jenny List (DESY), Karl Jakobs, Lydia Brenner, Nadia Pastrone, Tatsuya Nakada, Yifang Wang
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1:00 PM
Lunch Break
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2:30 PM
Social Event: free afternoon
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Plenary Auditorio
Auditorio
Convener: Brian Foster (DESY/Oxford)-
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Future hadronic collider - General projectSpeakers: Martin Aleksa, Martin Aleksa (CERN)
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Quantum technologies for high energy physicsSpeaker: Michael Doser (CERN, MIT, Oxford)
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10:30 AM
Coffee Break UPF
UPF
Barcelona, Spain
Carrer de Balmes, 132 - 134, L'Eixample, 08008 Barcelona -
Plenary Auditorio
Auditorio
Convener: Sebastian Grinstein (IFAE/ICREA)-
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The LGAD Technology: from Concept to ImplementationSpeakers: Pablo Fernandez (CNM), Pablo Fernandez Martinez (IMB-CNM, CSIC), Pablo Fernández Martínez (IFAE)
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Environmental IssuesSpeaker: Samuel Calvet (LPCA / IN2P3 / CNRS)
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What can a circular collider in the Z pole add to flavor factoriesSpeakers: Nazila Mahmoudi, Nazila Mahmoudi (Lyon University)
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