We study the \(th\) production at the LHC in the presence of a CP violating top Yukawa coupling. The helicity amplitudes for the \(ub\to dth\)(\(d\bar {b}\to u\bar {t}h\)) processes provide information on the kinematical distributions. Observables such as the azimuthal asymmetry between the forward jet and the top (antitop) quark, and the top (antitop) quark polarization asymmetry can be used to probe CP violation. Abstract Published by the Jagiellonian University 2025 authors

Next-to-leading order (NLO) QCD predictions coupled with parton showers, known as NLO matching, have been widely used for the precision era at the LHC. While two methods — <span class="sc">Mc@Nlo</span> and <span class="sc">Powheg</span> — have been widely adopted for this purpose, a third method, KrkNLO, has recently been described and implemented within <span class="sf">Herwig 7</span> for colour-singlet processes. We present phenomenological results of this method for the charged-current Drell–Yan process and compare with the <span class="sc">Mc@Nlo</span> method. Abstract Published by the Jagiellonian University 2025 authors

Recent measurements from the heavy-ion physics programme from the ATLAS experiment at the LHC are reviewed. They include azimuthal flow at high transverse momenta (\(p_{\mathrm {T}}\)), \(p_{\mathrm {T}}\) fluctuations in lead–lead (Pb+Pb) and xenon–xenon (Xe+Xe) collisions, jet-radius dependence of di-jet asymmetry, and an observation of top-quark pair production in proton–lead (\(p\)+Pb) and Pb+Pb systems. Results of a search for a diffusion wake in \(\gamma \)–jet events are also discussed. Moreover, results from ultra-peripheral collisions for photonuclear di-jet production and a search for magnetic monopoles are presented. Abstract Published by the Jagiellonian University 2025 authors

The Compact Muon Solenoid detector (CMS) was designed to analyze data mainly from proton–proton collision, but its robust design allows also for the analysis of data from heavy-ion collisions. This contribution describes a few examples of recent results of heavy-ion data analyses from CMS. Abstract Published by the Jagiellonian University 2025 authors

Abstract Published by the Jagiellonian University 2025 authors

The strong electromagnetic field induced by a nucleus moving with relativistic velocity in ultraperipheral collisions is a source of the quasireal photons, which can be absorbed by the partner nucleus and excite it. This leads to the evaporation of particles such as neutrons, protons, and alpha particles. In our recent work, we applied the Equivalent Photon Approximation to calculate the cross sections for evaporation of given multiplicities of particles. We tested different statistical nuclear models, such as <span class="sf">GEMINI++</span> and <span class="sf">HIPSE</span>, to define the probability functions. We also suggested a new, phenomenological approach for the estimation of excitation energy called the Two Component Model. The results were compared with recent ALICE data obtained with the neutron and proton Zero Degree Calorimeters. Abstract Published by the Jagiellonian University 2025 authors

I discuss recent results that confirm that one can associate entropy with partonic content of the proton. Furthermore, I show that complexity of the proton is characterized by the parton momentum density function. Abstract Published by the Jagiellonian University 2025 authors

ATLAS (A Toroidal LHC Apparatus) detector will undergo modernization between 2026 and 2030 to prepare for operations in the high-luminosity regime of the High-Luminosity Large Hadron Collider. Patch Panel 2 (PP2) is an active component of the strip tracker’s power supply (PS) chain, which will be located inside the ATLAS detector. For safety and control reasons, an independent readout system is needed to connect to PP2. This paper presents the PP2 control and monitoring system as implemented during the prototype and pre-production phases and outlines the quality control plans for the pre-production PP2 series currently under development in Kraków. Abstract Published by the Jagiellonian University 2025 authors

This document presents an overview of recent ATLAS searches in the Higgs sector using the full Run 2 dataset of proton–proton collisions at \(\sqrt {s} = 13\) TeV, corresponding to an integrated luminosity of 140 fb\(^{-1}\). The analyses include searches for additional scalars, charged Higgs bosons, and exotic decays. Abstract Published by the Jagiellonian University 2025 authors

Heavy flavour production cross sections and lifetimes in hadron colliders inform and challenge perturbative and non-perturbative quantum chromodynamics (QCD) determinations, while providing sensitivity to physics beyond the Standard Model. Using up to 140 fb\(^{-1}\) of \(pp\) collisions at \(\sqrt {s}=13\) TeV from Run 2 of the LHC, recent results from the ATLAS experiment are presented: differential charmonium production cross sections extending up to transverse momenta (\(p_{\mathrm {T}}\)) of 360 GeV (\(J/\psi \)) and 140 GeV (\(\psi (2S)\)), differential open-charm \(D^\pm \) and \(D^\pm _s\) meson production cross sections extending up to \(p_{\mathrm {T}} = 100\) GeV, and the open-beauty \(B^0\) meson effective lifetime of \(\tau _{B^0} = 1.5053 \pm 0.0012 \mathrm {(stat.)} \pm 0.0035 \mathrm {(syst.)}\) ps, to date the most precise single measurement of this quantity. Abstract Published by the Jagiellonian University 2025 authors