https://hdl.handle.net/10481/31420 2026-04-06T11:00:28Z 2026-04-06T11:00:28Z Puerta Megías, Daniel Anguiano Millán, Marta González, W. https://hdl.handle.net/10481/112180 2026-03-16T12:49:50Z

A Monte Carlo study of proton LET calculations: Comparison between the codes PENHAN, FLUKA, and TOPAS Puerta Megías, Daniel; Anguiano Millán, Marta; González, W. Background: Linear energy transfer (LET) is frequently used to characterize radiation quality in proton therapy and is an important quantity for radiobiological modeling. However, LET calculations can, in principle, vary between Monte Carlo (MC) codes, affecting consistency in treatment planning and relative biological effectiveness (RBE) estimation. Purpose: This study aims to investigate the variability of LET results when using different MC codes. Methods: An intercomparison of LET results was performed using penhan, topas MC, and CERN fluka, together with recently published experimental data. Track-averaged (Lt) and dose-averaged (Ld) LET were evaluated under different irradiation configurations, including pencil and broad beams, with and without nuclear reactions. Results: The results obtained indicate that discrepancies in LET calculations are primarily linked to the choice of stopping powers and the handling of nuclear interactions. Calculations considering only primary protons exhibited great agreement with recent experimental LET measurements, validating our simulations. Conclusions: Lt showed higher robustness and consistency across codes, suggesting it as potentially a more reliable metric for LET-based treatment planning and RBE modeling. Our findings emphasize the importance of consistent LET calculations, result reporting, and code benchmarking in proton therapy calculations.

Tamang, Ashis Rai, Nishal Landsteiner, Karl Megías Fernández, Eugenio https://hdl.handle.net/10481/111996 2026-03-09T13:24:45Z

Anomaly induced transport from symmetry breaking in holography Tamang, Ashis; Rai, Nishal; Landsteiner, Karl; Megías Fernández, Eugenio We study the transport properties of relativistic fluids induced by quantum anomalies in presence of explicit symmetry breaking. To this end we consider a holographic Einstein-Maxwell model in 5 dimensions with pure gauge and a mixed gauge-gravitational Chern-Simons terms, coupled with a scalar field. To study the chiral vortical effects and the energy transport sector, apart from the chiral magnetic effects, we have considered the full backreaction of the gauge field on the metric. We have studied the anomalous effects by using Kubo formulae involving correlators of the charged currents and the energy current. Our findings reveal that, in the presence of explicit symmetry breaking, anomaly-induced transport phenomena can extend beyond anomalous currents and affect non-anomalous sectors as well. In particular, we find that all the conductivities display a distinct sensitivity to the mass parameter controlling the symmetry breaking, thus reflecting the interplay between anomaly coefficients and explicit symmetry breaking terms. These findings highlight the role played by pure gauge and mixed gauge-gravitational anomalies in holographic transport, and their importance for strongly coupled systems with broken symmetries.

Martínez Consentino, Víctor Leopoldo Amaro Soriano, José Enrique Segovia, Jorge https://hdl.handle.net/10481/111308 2026-02-20T11:34:38Z

Scaling Properties of Two-Particle–Two-Hole Responses in Asymmetric Nuclei for Neutrino Scattering Within the Relativistic Mean-Field Framework Martínez Consentino, Víctor Leopoldo; Amaro Soriano, José Enrique; Segovia, Jorge We perform a systematic analysis of the nuclear dependence of two-particle–two-hole meson-exchange current contributions to inclusive lepton-nucleus scattering within the relativistic mean-field framework. We present microscopic calculations of nuclear responses for a set of 17 nuclei, ranging from helium to uranium, using a model with different Fermi momenta for protons and neutrons. We propose a novel scaling prescription based on the two-particle phase space and key nuclear parameters. The resulting description is accurate over a wide range of nuclear targets, with typical deviations below 10%, and allows for a separate treatment of the different emission channels. In addition, a consistent benchmark against electron-scattering data is provided. The parametrization presented provides a practical framework for extending the responses to different nuclear targets in neutrino event generators.

Gálvez Viruet, Juan José Llanes Estrada, Felipe J. https://hdl.handle.net/10481/110653 2026-02-04T11:43:42Z

Preparations for Quantum Computing in Hadron Physics Gálvez Viruet, Juan José; Llanes Estrada, Felipe J. Quantum computers are coming online and will quickly impact hadron physics once certain fidelity, decoherence and memory thresholds are met, quite possibly within a decade. We review a selected number of topics where ab-initio Quantum Chromodynamics-level information about hadrons can be obtained with this computational tool that is hard to come by from other methods. This includes high baryon-density systems such as neutron-star matter (with a sign problem in lattice gauge theory); fragmentation functions; Monte Carlo generation of particles which accounts for quantum correlations in the final state; entropy production in jets; and generally, any application where time evolution in Minkowski space (as opposed to a Euclidean formulation) or where large chemical potentials play an important dynamical role. For other problems, such as the prediction of very highly excited hadron spectroscopy, they will not be a unique, but a complementary tool.

Romera Gutiérrez, Elvira Nagy, Agnes https://hdl.handle.net/10481/110582 2026-02-02T11:34:38Z

Density Functional Theory and Information-Theoretic Diagnostics of Quantum Phase Transitions Romera Gutiérrez, Elvira; Nagy, Agnes Within density functional theory (DFT), where the density is the fundamental vari able, quantum phase transitions (QPTs) can be formulated through a Hamiltonian H = ˆH0+∑iξi ˆAi, such that the control parameters {ξi} are in bijective correspondence (in the nondegenerate case) with the “densities” ai = ⟨ ˆAi⟩, and the functional Q({ai}) acts as the Legendre transform of the energy; this structure even permits the use of Rényi entropy (for a given order) as an alternative control parameter, while degeneracy can be handled via a subspace density. On this foundation, information-theoretic measures provide sensitive diagnostics of criticality: fidelity and its susceptibility χ, Fisher information, relative Rényi entropy, and the Kullback–Leibler divergence are locally linked by Rq≈ q IKL≈ 2qχ(δλ)2, revealing their proportionality in the small-parameter-shift regime. Applied to the Dicke model, numerical analyses show that fidelity exhibits pronounced curvature or divergence near λc = √ ωω0/2 and that the response sharpens with increasing j, corroborating that these information measures capture QPTs with precision within the DFT framework.