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Tomas Davidek (Charles University (CZ))10/09/2026, 09:00
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Jana Faltova (Charles University (CZ))10/09/2026, 09:15
News from ATLAS experiment
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Martin Divisek (Charles University (CZ))10/09/2026, 09:45
The Higgs boson remains an object of key interest due to its unique position and role in the Standard Model framework. The cross-sections of three dominant production modes (gluon-gluon fusion, ggH; vector boson fusion, vbfH; and associated production alongside a vector boson or higgsstrahlung, VH) are analysed through the $H\rightarrow\tau\tau$ decay channel. The analysis utilizes a partial...
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Azad Afandizada (Czech Technical University in Prague (CZ))10/09/2026, 10:03
A charged Higgs boson remains undiscovered to this day, despite the significant impact it would have for improving our understanding of particle physics. The detection of such a particle could revolutionize areas such as the study of electroweak symmetry breaking, extensions to the Standard Model and potentially open doors to entirely new physics. This study focuses on the detection of the...
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Filip Rucka10/09/2026, 10:21
This study investigates the separation of the rare tH(bb) signal from background processes using machine-learning methods in the ATLAS Release 22 framework. The tH(bb) process is sensitive to the interaction between the Higgs boson and the top quark, but its small production rate makes it
difficult to distinguish from dominant background processes.As a reference study, the previous...
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Dominik Babal (Slovak Academy of Sciences (SK)), Lucia Keszeghova (Comenius University (SK))10/09/2026, 11:00
Measurements of the associated production of a top-quark pair and a $Z$ boson ($t\bar{t}Z$) probe the coupling between the top quark and the $Z$ boson, thereby serving as indirect searches for new physics. Besides, $t\bar{t}Z$ measurements improve background estimation in some of the direct Beyond the Standard Model searches.
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The latest ATLAS $t\bar{t}Z$ cross section measurement at... -
Adriana Dohnalova (Comenius University (SK))10/09/2026, 11:25
Jet energy scale (JES) and jet energy resolution (JER) uncertainties are among the dominant systematic uncertainties in many ATLAS measurements. After the application of simulation-based calibrations, residual differences between data and simulation are corrected using data-driven in situ techniques. In this contribution, a new in situ calibration approach exploiting $t\bar{t}$ events in the...
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Barbora Eckerova (Comenius University Bratislava), Jiri Hejbal (Czech Academy of Sciences (CZ))10/09/2026, 11:45
The charge asymmetry is a property of top-quark pair production predicted by the Standard Model which has already been measured at various center-of-mass energies. This analysis would like to follow up on the previous measurement, which observed non-zero charge asymmetry at 4.7 sigma significance level. This effort aims to overcome the previous successful measurement and claim the discovery of...
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Andrej Durica (Comenius University (SK))10/09/2026, 12:10
The top quark is the heaviest known fundamental particle, making the precise determination of its properties a critical test of the Standard Model (SM) of particle physics. While the top-quark mass and decay width are closely linked within the SM framework, a simultaneous measurement of both parameters has never previously been performed by the ATLAS experiment. This talk presents the current...
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Peter Svihra (Czech Academy of Sciences (CZ), Czech Technical University in Prague (CZ))10/09/2026, 14:00
This overview introduces DRD3 as the international framework coordinating research and development of semiconductor detector technologies for future experiments beyond the HL-LHC, and presents two complementary activities carried out by Prague teams mainly within OPJAK-FORTE. The talk provides context for the work on the OCTOPUS project and SiC sensor development activities, further discussed...
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Jakub Bucko (Charles University (CZ))10/09/2026, 14:30
The LHC will undergo a major upgrade during the upcoming Long
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Shutdown 3. The goal of the upgrade is to increase the collider luminosity, i.e. the
number of collisions per second. This means higher strain on the already ageing
ATLAS detector, so it also has to be upgraded. Part of the upgrade is replacement
of the current tracker for new full-silicon tracker called Inner Tracker (ITk).... -
Vojtech Kracmar (Czech Technical University in Prague (CZ))10/09/2026, 14:48
This contribution presents an overview of the investigation of radiation effects in 4H-SiC PN diodes and LGADs fabricated by onsemi, including both single-channel and segmented (strip and pixel) devices. The sensors were irradiated with protons, reactor neutrons, and 60Co gamma rays. Radiation-induced changes were assessed using current-voltage (IV) and capacitance-voltage (CV) measurements,...
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Ivan Raksanyi (Czech Technical University in Prague (CZ))10/09/2026, 15:06
Monolithic Active Pixel Sensors (MAPS) are key candidates for future HEP tracking detectors due to their high granularity, low material budget and low power consumption.
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The H2M (Hybrid-to-Monolithic) chip is one of the prototypes designed within this framework.
Multiple samples of the H2M detector were irradiated with either Protons or high energy electrons at different fluences.
The... -
Lukas Kvasnicka (Czech Technical University in Prague (CZ))10/09/2026, 15:16
The presentation compares Towerjazz 180 nm technology, used in current sensors at CERN, with TPSCo 65 nm technology for future molythic pixel detectors. The new technology will then be presented in relation to the target parameters of the OCTOPUS project, using measurement results from the already constructed MOSAIX prototype. The presentation will then cover the current status of the OCTOPUS...
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Vojtech Pleskot (Charles University (CZ))10/09/2026, 16:00
Introduction to Czech and Slovak activities within IPPOG
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Marek Bombara (Pavol Jozef Safarik University (SK))10/09/2026, 16:18
News from ALICE experiment
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Lucia Anna Tarasovicova (Pavol Jozef Safarik University (SK))10/09/2026, 16:48
Measurements in pp and p-Pb collisions have revealed that these small collision systems exhibit several features traditionally attributed to heavy-ion collisions, including the smooth increase of the strange hadron yields with the collision multiplicity (strangeness enhancement). However, the microscopic origin of this phenomenon in small systems remains an open question. In particular, the...
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Filip Krizek (Czech Academy of Sciences (CZ))10/09/2026, 17:06
The ALICE experiment investigates the properties of the quark-gluon plasma (QGP) created in ultrarelativistic heavy-ion collisions. Two of the most prominent signatures of QGP formation are the collective hydrodynamic expansion of the produced medium and the energy loss of high-energy partons traversing the medium, known as jet quenching. Measurements in small collision systems, such as p-Pb,...
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Emil Lelak (Charles University (CZ))10/09/2026, 17:24
This contribution presents the status of an ongoing ATLAS analysis of jet substructure in Z+jet events in heavy-ion and proton-proton collisions at the energy of 5.36 TeV. The study utilizes Z bosons reconstructed through their dilepton decay channels and examines jet substructure observables to investigate modifications of the parton shower in the quark-gluon plasma – extremely hot and dense...
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Petr Baron (Palacky University (CZ))10/09/2026, 17:42
Measurements of jet production in nuclear collisions provide important constraints on parton energy loss and the properties of the quark–gluon plasma. This contribution presents recent ATLAS studies of jet nuclear modification using LHC collision data. Jet yields are compared with suitable proton–proton reference measurement and studied as functions of jet transverse momentum, collision...
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Tomas Nosek (Charles University (CZ))11/09/2026, 09:00
Neutrino oscillations provide compelling evidence for physics beyond the Standard Model, suggesting that neutrinos have mass. This talk will review the current experimental picture and highlight the prospects of next-generation projects in addressing the open questions of neutrino oscillation physics: CP violation, the neutrino mass ordering, and precise measurements of neutrino mixing parameters.
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Tomas Tmej (Charles University (CZ))11/09/2026, 09:18
Experiment JUNO is a neutrino oscillation experiment located in southern China. It is located 53 km away from 2 nuclear powerplants with overall power of about 36 GW (one powerplant is not yet completed) and the experiment uses its 20 kton liquid scintillator as a target. The experiment has many goals and ambitions e.g. determining the neutrino mass hierarchy, measurement of the oscillation...
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Michal Lelák11/09/2026, 09:36
Recent measurements of rare kaon decays from the NA62 experiment will be presented, highlighting the contributions of the Charles University group. The results include new measurements of $K^+ \to \pi^+ \nu \bar{\nu}$, $K^+ \to \pi^+ \pi^+ \pi^- \gamma$, $K^+ \to e^{+} \nu \gamma$, and $K^+ \to \mu^+ \nu \mu^+ \mu^-$. Ongoing analyses and future prospects will also be discussed.
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Matej Karas (Comenius University (SK))11/09/2026, 09:54
The NA62 experiment at CERN collected the largest sample of charged kaon decays in the world during the years 2016 - 2026. The most recent results and prospects of future analyses of the collected dataset will be presented.
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Martin Vavrik (work on IEAP CTU, student of IPNP CUNI)11/09/2026, 10:12
In this work, we describe the development of track- and energy-reconstruction algorithms for atypical Time Projection Chambers (TPCs) that will be used at the Institute of Experimental and Applied Physics, Czech Technical University in Prague, to search for the anomalous internal pair creation reported by the ATOMKI group.
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These chambers operate with an inhomogeneous toroidal magnetic field... -
Jakub Motyčka11/09/2026, 10:22
This project focuses on the development of a fast, flexible, and modular simulation of photon propagation produced by a charged particle traversing a crystal of arbitrary shape. The physical model includes photon production via scintillation and Cherenkov radiation.
The main goal of the developed software tool is to enable targeted optimization of the optical geometry and output signal...
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Vendula Benesova (Charles University (CZ))11/09/2026, 11:00
COMPASS experiment at CERN had a wide physics programme. One of its cornerstones were studies of hadron production in deep inelastic scattering (DIS), which can be interpreted in the transverse-momentum-dependent (TMD) factorisation framework, allowing to access the distributions of polarisation and transverse momentum of quarks within the nucleon in the language of TMD PDFs, and the...
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Gokul Duraikandan (Charles University (CZ))11/09/2026, 11:18
Rare flavour-changing neutral-current decays are powerful probes of the Standard Model and of possible new physics, as they are suppressed in the Standard Model and can receive contributions from virtual heavy particles. The decay $B^0 \to K^{*0}\mu^+\mu^-$ provides a particularly rich channel through its multidimensional angular distribution, from which observables sensitive to the $b \to...
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Catalina Lesmes Ramirez (Czech Technical University in Prague (CZ))11/09/2026, 11:36
The Timepix3 detector network installed inside the ATLAS cavern [1] has demonstrated reliable performance for measuring particle fluxes and monitoring luminosity during LHC operations [2, 4]. Comprising fourteen operational detectors distributed throughout the ATLAS experiment, the network is exposed to diverse radiation fields and flux levels. Detectors closer to the interaction point provide...
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Michal Dubovsky (Comenius University (SK))11/09/2026, 11:54
The talk will give an overview of an multithreaded (multiple CPU cores), physics framework FastFrames, used by the ATLAS collaboration. The goal of FastFrames is to enable analysis teams to efficiently scale their analysis specific code to multiple CPU cores, thus significantly speeding up physics analysis timescale by reducing computational time.
The talk will describe key problems that...
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Lukáš Viceník (Czech Technical University in Prague (CZ))11/09/2026, 12:12
Machine-learning benchmarks for signal--background separation in high-energy physics are often confounded by inconsistent feature definitions, training procedures, and evaluation metrics. We present a controlled comparison of six architectures for ttH multilepton classification, from XGBoost to Lorentz-equivariant graph networks, under standardised hyperparameter optimisation across a...
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Ondrej Penc (CERN)11/09/2026, 14:00
This talk will cover the quantum-information observables that can be measured with the ATLAS experiment at the LHC. After a short introduction to the relevant concepts, I will discuss current measurements and present the most recent results. Finally, I will introduce a future measurement in which our institute is involved.
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7. Search for QCD instantons in proton–proton collisions at ATLAS using inner detector and ALFA dataRadek Vavricka (Charles University (CZ))11/09/2026, 14:18
QCD instantons are non-perturbative, semiclassical solutions of the Yang–Mills equations that connect topologically distinct vacua and encode tunneling between them. They underlie key phenomena such as axial U(1)U(1)U(1) symmetry breaking, anomalous chirality violation via the axial anomaly, and contribute to the structure of the QCD vacuum and chiral symmetry breaking. Their observation would...
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Vojtěch Loubal11/09/2026, 14:36
QCD instantons are non-perturbative, topological gluon-field configurations that mediate chirality-violating processes whose experimental signature is an isotropic, flavour-democratic, high-multiplicity final state, absent from the perturbative expansion and so far unobserved. We present a new Monte Carlo generator for QCD instanton-induced processes in proton–proton collisions, filling a gap...
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27. Search for Axion-Like-Particles using di-photon signature with the ATLAS Forward Proton DetectorViktoriia Lysenko (Czech Technical University in Prague (CZ))11/09/2026, 14:47
The search for an Axion-like particle in light-by-light scattering in Run-3 LHC data using the central ATLAS detector for di-photon signature and ATLAS Forward Proton (AFP) detector for a scattered forward proton signature is presented together with the operational and data quality challenges for the AFP detector.
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Tadeas Petru (Charles University (CZ))11/09/2026, 15:05
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Gabriela Karkošová Martinovicová (Charles University)11/09/2026, 15:50
Searches for final states with large missing transverse momentum recoiling against a jet or a hadronically decaying vector boson provide strong constraints on a wide range of physics scenarios beyond the Standard Model. This contribution presents a reinterpretation of existing ATLAS and CMS monojet and mono-V searches at center-of-mass energy of 13 TeV in the context of excited-neutrino...
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Filomena Sopkova (Slovak Academy of Sciences (SK))11/09/2026, 16:08
The ALLEGRO detector is one of the detector concepts proposed for the Future Circular Collider electron–positron programme (FCC-ee). A key component of the detector is a high-granularity electromagnetic calorimeter based on noble-liquid technology developed within the DRD Calo collaboration. The calorimeter design combines excellent energy resolution with fine detector segmentation, which is...
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Matej Haviernik (Charles University (CZ))11/09/2026, 16:26
The Future Circular Collider in its electron–positron configuration (FCC-ee) offers an exceptional environment for probing physics beyond the Standard Model through high-precision measurements and unprecedented luminosity. One of the targets for BSM searches are axion-like particles (ALPs), which arise naturally in many extensions of the Standard Model and may provide insights into unresolved...
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Jana Bielcikova (Czech Academy of Sciences (CZ))11/09/2026, 16:44
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