A strong first-order electroweak phase transition (EWPT) can be realized through the introduction of a light scalar that is weakly coupled to the Higgs boson. Such weak couplings can result in a macroscopic lifetime, leading to displaced decays that provide a distinctive experimental signature. In this talk, we investigate the sensitivity of future lepton colliders to long-lived scalars "s"...
Heavy quarkonia provide ideal probes of strong interactions in both the perturbative and nonperturbative regimes. They have therefore been extensively studied at a wide range of accelerator-based high-energy experiments, including electron-positron colliders such as BESIII, Belle, and LEP, as well as at future facilities. However, NNLO QCD predictions for quarkonium production and decay...
The two-Higgs-doublet model with a light pseudoscalar singlet (2HDM + a) provides a wellmotivated dark matter (DM) framework, but hadron colliders face severe background ceilings
in the light-scalar (mh1) and light-mediator (ma) windows, while non-relativistic directdetection bounds are momentum-suppressed. To address these experimental bottlenecks, this study investigates the potential of...
We propose the first moments of electric-charge, baryon-number, and strangeness flows into jets as direct probes of the flavor composition and diquark content of the QCD vacuum excitations during hadronization. Current conservation laws render these moments invariant under renormalization-group evolution, while color triality constrains the allowed screening states at the endpoint of the...
We will describe progress along simulation based inference in the precision era.
In order to ensure measurement of the integrated luminosity with a relative precision of 10−4 at the Z0 pole at CEPC, numerous systematic effects have to be quantified and corrected for. Here we discuss collective impact of electromagnetic bunch fields on the initial state electrons and positrons as well as on the final states produced in Bhabha scattering. These effects change four-momenta of...
The pixel density of the front-end detectors continues to rise, and with it the power they consume—now stretching into the watt range—while the cable mass and thermal budget of the detector volume remain essentially fixed. Today's arrays are powered in parallel at low voltage and high current (roughly 2 V/24 A), a scheme that already strains the cable budget and the associated I²R losses. This...
High-energy physics experiments require increasingly high-speed data transmission in front-end readout systems. Based on our prior designs and measurements, the 10-Gbps NRZ transmission is approaching the bandwidth limit of the 55-nm CMOS process. Consequently, PAM4 transmission technology, which doubles the data rate within the same analog bandwidth, presents an attractive alternative.
The...
An harmonious calorimeter idea has been proposed. We designed a new structure of ECAL and HCAL. More detailed structure information will be introduced in this report. A new cooling scheme has been proposed and test also has been carried out.
We present the first principle calculation of $\Xi \rightarrow \Lambda$ form factors employing 2 + 1 flavor gauge ensembles with lattice spacings ranging from 0.06 to 0.1 fm and pion masses between 230 and 340 MeV.
preliminary air cooling test results of the VTX thermal mockups .
The inner vertex detector of the IDEA detector concept is based on MAPS technology, and is expected to dissipate less than about 50 mW/cm2. With such low power density air-cooling solutions can be developed. Two main mechanical arrangements for the silicon sensors are envisaged at the moment:a ‘traditional’ flat version, in which MAPS are put on top of a carbon fibre stave, and a curved sensor...
MFP is a new flavor-symmetry spurion framework that provides minimal protection for generic new physics at the TeV scale to satisfy stringent FCNC bounds. It lies at the opposite end of the spectrum from the well-established MFV, opening up a broader landscape of flavor-safe TeV-scale models. Its defining features—maximal universality violation and flavor-charged currents—can both be...
This talk will present the latest status of Zero Degree Calorimeter at BESIII. The structure of ZDC is inspired by the CEPC LumiCal which is made of Lyso crystal and SiPM.
Its primary goal is to measure the instantaneous luminosity of BEPCII and can be extended to tag the ISR photon.
The developing progress of the CEPC detector magnet is introduced in the report, including the Box-type aluminum stablized NbTi Rutherford cable and HTS cable.
Modern particle physics detectors contain many readout channels that continuously produce large amounts of data. These data must be transferred from back-end electronics to readout servers with high bandwidth and low latency while keeping CPU processing and memory-copy overhead low. This work presents an FPGA-based RoCEv2 protocol stack designed for detector data readout. The protocol stack...
The development of robust, precise and computationally efficient track reconstruction is important for CEPC offline reconstruction and its future high-level trigger (HLT) development, where tracking algorithms must balance reconstruction performance with the computational demands of large-scale event processing. In particular, charged-particle motion in magnetic fields and interactions with...
We investigate the phenomenology of 2 Higgs doublet models (2HDMs) with a new $U(1)$ gauge symmetry, $U(1)_X$, by which flavor changing neutral currents are forbidden at tree level. As an important consequence of the spontaneous breaking of both the $U(1)_X$ and electroweak symmetries by electroweak vacuum expectation values, upper limits appear on masses of an additional gauge boson $Z'$ and...
The progress of control system till OCt. 2026 will be introduced. Especially the progress of the accelerator data acquisition of the intellectual upgrade project of BEPCII will be introduced.
Future collider detectors will require tracking detectors with a detection surface of several hundreds of square meters, combined with requirements on spatial resolution of a few microns per track, coupled with as small power consumption as possible. Specialized sensors with a time resolution of 100 ps or better will also be required to add TOF capabilities to the detectors. MAPS sensors are...
If the SM-like Higgs boson is realized as a mixture of scalar and pseudoscalar states, the CP violating mixing angle can be measured through various Higgs boson production and decay channels. Here we consider Higgs to tau-pair decays, at 240 GeV CEPC with 5.6 ab-1 of simulated data. Preliminary projections of the absolute uncertainty of the mixing angle are given, for the Higgs boson...
Aerogel is unique material with refractive index between gaseous and liquids. Due to this circumstance highly transparent aerogels are good candidates for Cherenkov radiators in RICH detectors. There are several HEP projects required excellent PID performance in the world. For some of them RICH detectors based on aerogel produced in Novosibirsk were proposed by BINP team. Among them FARICH...
Precise measurements of Higgs decays into quarks and gluons are essential for probing the Yukawa couplings of the Higgs boson and testing the flavor structure of the Standard Model. We investigate the process e+e− → ZH at √s = 240 GeV at a future e+e− Higgs factory, taking the CEPC design as a benchmark. The analysis focuses on events with Z → νν¯/mu+mu- and hadronic Higgs decays H → b¯b, cc¯,...
This work presents the design and analytical optimization of a high-power, high-efficiency S-band multi-beam klystron (MBK) intended as an RF power source for large-scale scientific facilities. Existing accelerator klystrons demonstrate $50-80 MW$-class peak power near $2.856 GHz$, whereas established MBKs and recent high-efficiency developments operate in the $60-70\%$ electronic-efficiency...
Future electron-positron collider experiments impose stringent requirements on calorimeter systems, including high granularity (compatible with the particle flow approach), excellent energy resolution, low cost, and large-scale constructability. While existing calorimeter concepts each possess distinct merits, none can simultaneously satisfy all of the above criteria. Scintillating glass, as a...
Future circular $e^+e^-$ colliders require tracking systems that combine a very low material budget, high spatial resolution, mechanical stability, and particle identification capabilities. As part of the IDEA detector concept, the INTREPID drift chamber is being developed as an ultralight central tracker based on a large number of thin wires and composite structural components.
This...
TBA
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...
Higher-order contributions due to initial state radiation (ISR) in electron-positron annihilation processes are analyzed analytically and numerically. Effects due to variation of factorization scale and scheme choices in ISR are studied. A new procedure for exponentiation of higher-order next-to-leading photonic and pair corrections is suggested. The results are relevant for increasing the...
Grid Data Transfer Infrastructure for CEPC
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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...
Recent developments in artificial intelligence, particularly large language models (LLMs), have shown promise for improving productivity in high-energy physics. While there has been published work on the use of LLMs for data processing, very little has been published on their application to high-energy physics (HEP) research workflows.
In this paper, we describe our efforts to apply LLMs...
In this talk, we present our experience in organizing high-energy physics
computing at JINR for data processing and analysis, drawing on examples from
the LHC, NICA, JUNO, and other experiments.
Bismuth germanate (Bi₄Ge₃O₁₂, BGO) scintillation crystals, owing to their high density (7.13 g/cm³) and high effective atomic number (74), offer significant advantages in detection efficiency and energy resolution for high-energy rays. They are widely used in high-energy physics, nuclear physics, space physics, industrial measurement and control, environmental monitoring, and security...
The Circular Electron Positron Collider (CEPC) aims to test the Standard Model and search for new physics through precision measurements of electroweak, Higgs, and heavy-flavour processes. CEPC plans high-luminosity operation at energies relevant to Higgs, W, and Z boson production, with an expected physics event rate of the order of 100 kHz at the Z pole. Under these conditions, beam-induced...
We are developing a unified monitoring framework for Distributed Computing Infrastructure (DCI), covering computing resources, storage, data transfer, and key services. Recent work focuses on automating Grafana dashboard generation and maintenance, reducing manual configuration and improving consistency across sites.
The SAM Test framework has also been refactored into a more modular...
We present recent updates to the ReneSANCe Monte Carlo event generator.
ReneSANCe provides one-loop EW and higher order corrections for the processes
$e^+e^- \to HZ$, $e^+e^- \to ZZ$, $e^+e^- \to \gamma Z$ and processes used for luminosity monitoring.
We have taken the first steps to enable decays of final state unstable particles and radiative corrections in decays. All spin correlations...
High-power microwave (HPM) systems are essential for accelerating charged particles in large-scale accelerators, where precise control of microwave parameters—such as amplitude, phase, and pulse shape—is critical to achieving high beam quality. Among the key HPM components, pulse compressors, variable attenuators, phase shifters, and absorbing loads play pivotal roles in beam dynamics...
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Highly compact and granular electromagnetic calorimeters are required for precision luminosity measurements at future e⁺e⁻ colliders and for the determination of positron multiplicity and energy spectra in the LUXE experiment.
A silicon–tungsten sampling calorimeter is being developed within the FCAL and DRD Calo collaborations. Its construction poses a significant technological challenge,...
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...
We give a report on new developments in the gamma-gamma collision mode of the ReneSANCe Monte Carlo event generator. Results for a number of polarized Standard Model processes will be presented for future gamma-gamma colliders based on ee-colliders where high energy photons are produced via Compton backscattering of laser beams.
In this talk, I will cover both the Axion-Like Particles and Tau weak electric dipole moments. Our combined analysis shows that mono-V and non-resonant VBS channels provide powerful and complementary probes of ALP-gauge boson interactions. Tau spin correlations at the Z pole probe CP violation with a sensitivity that depends strongly on the spin projection. For a fixed Z sample, transverse...
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Future high-energy physics facilities (HL-LHC, CEPC, FCC) and nuclear fusion experiments require detectors with superior radiation tolerance and high time resolution. Silicon carbide (SiC) has emerged as an ideal candidate to replace conventional silicon-based detectors, owing to its wide bandgap, high displacement threshold energy, high thermal conductivity, high critical breakdown electric...
Bismuth silicate (Bi4Si3O12, BSO) crystal is a promising inorganic scintillator for the electromagnetic calorimeters of future high-energy physics experiments. It offers stopping power and density comparable to those of bismuth germanate (Bi4Ge3O12, BGO), together with a faster decay time, greater radiation hardness, and lower raw-material cost. Large, high-quality BSO crystals are...
We investigate the sensitivity of proposed CEPC and FCC-ee with a center-of-mass energy of 240 GeV to long-lived dark photons heavier than 2 GeV that are pair-produced via the prompt decays of a light scalar mixed with the Standard-Model Higgs boson. We compute the production and decay rates of both the light scalar and the dark photon, and develop two search strategies targeting displaced...
Quantum-information observables offer new tools for probing collider events beyond traditional quantities such as cross sections and invariant masses. This work investigates quantum entanglement in top–antitop pairs produced via e⁺e⁻ → tt̄, using spin density matrices generated with the recently developed Density Mode framework within MadGraph5_aMC@NLO. Events were simulated at leading order...
Modern detector systems for particle physics, such as the outer tracker (OTK) of the future CEPC detector, aim to simultaneously improve timing and spatial resolution while reducing the amount of material in the detector and simplifying its readout electronics. One possible solution is the use of RSD-LGAD sensor strips with lengths on the order of centimeters. Such sensors can provide particle...
Long scintillation strips with embedded WLS fibers are widely used in muon systems of modern experimental facilities, including future electron-positron colliders. To accurately reconstruct particle tracks and to simulate the passage of particles through the strips of the muon system, it is necessary to know the parameters of the scintillators with high accuracy: light output, attenuation...
We explore quantum entanglement and Bell-inequality violation in Higgs decays at the CEPC, using simulated e+e−→ZH events at $\sqrt{s} = $ 250 GeV with 50 $\mathrm{ab}^−1$. From lepton angular distributions in $H\to ZZ^*\to$ 4ℓ, we reconstruct the ZZ spin-density matrix and test the CGLMP inequality for a two-qutrit system. Considering semileptonic and pure-leptonic associated-Z channels, we...
The IDEA detector concept has been proposed for experiments future high-energy electron-positron colliders, covering a rich physics program from the Z to WW, H and ttbar. The tracking system of the IDEA detector concept consists of different subsystems: a vertex detector, with an inner and outer section, a drift chamber and a silicon wrapper between the drift chamber and the calorimeters. In...
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We present the two-loop mixed strong-electroweak virtual corrections to the production of a massive bottom-antibottom quark pair in electron-positron collisions. The evaluation of all the relevant Feynman integrals, including those with up to five internal massive lines with three different mass values, has been worked out relying on semi-analytical techniques, using complex-valued masses for...
UP bare stave design and thermal study
