The conic hulls/triangulation method is extended to the analytic computation of multiple Mellin–Barnes having polygamma functions of arbitrary order in their integrand. This computational approach is automatized in the <span class="tt">MBConicHulls.wl</span> <span class="sf">Mathematica</span> package, which we give a brief description of the new corresponding functionalities, basing our discussion on the example of a simple two-loop sunset integral. Abstract Published by the Jagiellonian University 2026 authors

We investigated the use of a U-Net convolutional neural network for denoising simulated medium-resolution stellar spectroscopic observations, generated under realistic observational conditions resembling the Subaru Prime Focus Spectrograph (PFS). We found that our U-Net model effectively captured spectral features, achieving an average relative error of around \(1\%\) across diverse stellar parameters, despite a limited training set of only \(1000\) observations and a relatively short training period. Although U-Net did not reach the performance previously demonstrated by denoising autoencoders (DAEs) trained extensively on larger datasets, it outperformed DAEs trained under similarly constrained conditions. These results indicate that the U-Net architecture offers rapid, robust feature learning and may be particularly advantageous in scenarios involving initial denoising, subsequently refined by more accurate, but otherwise slower deep-learning models. Abstract Published by the Jagiellonian University 2025 authors

By considering an ansatz for \((1+(3+n))\)-dimensional static spacetime with three-dimensional spherical symmetry, we find different classes of vacuum solutions of Einstein field equations. A class of solutions with nontrivial extension of the Schwarzschild spacetime with extra dimensions features unusual properties, which may provide a possibility to address problems of dark matter and dark energy. 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

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

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

Nuclear reactions among charged particles in stars take place at energies generally well below the Coulomb barrier, so its penetration factor exponentially suppresses the cross section down to values as small as few nanobarns or picobarns. Reaching astrophysical energies opens new challenges and calls for new approaches. In this work, the scope of nuclear astrophysics will be introduced and how experiments are usually conducted will be discussed. In particular, we will focus on the use of indirect methods as complementary approaches to direct measurements, introducing the asymptotic normalisation coefficient (ANC) technique and the Trojan Horse Method (THM), used to deduce the cross sections of reactions with photons and charged particles in the exit channel, respectively, with no need for extrapolation. Recent results of the application of the two methods will be exposed: the \(^6\mathrm {Li}({^3\mathrm {He}},d)^7\mathrm {Be}\) measurement used to deduced the ANCs of the \(^3\mathrm {He}+{^4\mathrm {He}}\to {^7\mathrm {Be}}\) and \(p+{^6\mathrm {Li}}\to {^7\mathrm {Be}}\) channels and the corresponding radiative capture cross sections. Then, the THM measurement of the \(^{27}\mathrm {Al}(p,\alpha )^{24}\mathrm {Mg}\) cross section through the \(^2\mathrm {H}(^{27}\mathrm {Al},\alpha {^{24}\mathrm {Mg}})n\) reaction will be reviewed, as well as the \(^{12}\mathrm {C}+{^{12}\mathrm {C}}\) fusion reaction cross section using \(^{14}\)N to transfer \(^{12}\)C and induce the reaction of astrophysical importance down to astrophysical energies. The indirect measurements made it possible to assess the occurrence of several resonances that are responsible for significant changes in the reaction rate at relevant temperatures. Abstract Published by the Jagiellonian University 2025 authors

The founding of an anomaly by A. Krasznahorkay and collaborators in the Internal Pair Creation (IPC) in \(^8\)Be triggered the worldwide effort to investigate this phenomenon. At the Laboratori Nazionali di Lengnaro (LNL-INFN), a new \( e^+e^-\) pair spectrometer was built, and the first experimental campaign was performed in 2023 and 2024. This work describes the methodology implemented to analyze the data collected, including the energy reconstruction of the \(e^+e^-\) and the relative angle at which they were emitted. Abstract Published by the Jagiellonian University 2025 authors

The reduction of the experimental spectroscopic factors when compared to shell model calculations and its dependence on the binding energy asymmetry has puzzled researchers for more than a decade. As it is understood, short-range correlations among nucleons play an important role in this quenching. To shed more light on this topic, an experiment was performed at GANIL to determine the reduction factor \({R}_{\mathrm {S}}\) in \(^{10}\mathrm {Be}(d,t)^9\mathrm {Be}\), \(^{10}\mathrm {Be}(d,{^3\mathrm {He}})^9\mathrm {Li}\), and \(^{12}\mathrm {Be}(d,{^3\mathrm {He}})^{11}\mathrm {Li}\) pick-up reactions. This work reports on the preliminary spectroscopic factors that will be used to extract \({R}_{\mathrm {S}}\), as well as a comparison and reanalysis of previous datasets for pick-up on \(^{10}\)Be. An agreement between our results and previously published data has been found, along with strong indications of a reduction factor in line with available systematics. Abstract Published by the Jagiellonian University 2025 authors

Besides the level scheme, absolute transition strengths between excited states yield fundamental information on nuclear structure and can be determined from level lifetimes. The recoil distance Doppler-shift (RDDS) technique is very valuable for the measurement of lifetimes in the picosecond range. During the last years, our group constructed several very compact plunger devices for RDDS experiments with \(\gamma \)-ray spectrometers coupled to charged particle detector arrays situated in the target chamber, and with dedicated setups for multinucleon transfer reactions where the plunger must be placed at the grazing angle of the reaction. Recent investigations have addressed the evolution of nuclear structure in neutron-deficient nuclei in the \(A=170\) mass region from yrast \(B\)(E2) values and are discussed in this article. For these investigations very small \(B_{4/2} = B(\mathrm {E2};4_1^+ \to 2_1^+)/B(\mathrm {E2};2_1^+ \to 0_1^+)\) ratios are of particular interest, which cannot be explained with standard collective models and which are not expected from the actual level schemes nor this far from closed shells. Here, we present our new work on \(^{168}\)W, \(^{172}\)Pt, and \(^{176}\)Pt, focus on this \(B\)(E2) anomaly, and include \(B\)(E2) values between higher yrast states for which experimental data have been sparse. Abstract Published by the Jagiellonian University 2025 authors