Preprints

In April 2013, the TeV blazar Markarian~421 underwent one of its most powerful emission outbursts to date. An extensive multi-instrument campaign featuring MAGIC, VERITAS, and \textit{NuSTAR} provided comprehensive very-high-energy (VHE; $E > 100$ GeV) and X-ray coverage over nine consecutive days. [...]

Three-dimensional velocity-map imaging and covariance analysis were used to identify over 50 fragmentation channels produced following the inner-shell ionization of selenophene at 120 eV. The majority resulted in two or three 'heavy' products containing selenium or carbon, many of which had identical mass-to-charge ratios but different chemical compositions due to the degree of hydrogenation and the selenium isotope involved. [...]

The in-situ crystallization kinetics of the highly porous Ti(IV)12 oxo-cluster based metal-organic framework (MOF) MIP-177(Ti)-LT (MIP: Materials from Institute of porous solids of Paris, LT: Low Temperature) were studied by synchrotron time-resolved powder X-ray diffraction. When dry formic acid (FA) was used as solvent the crystallization does follow the Johnson-Mehl-Avrami-Kolmogorov kinetics with an energy barrier of 74 kJ·mol-1 without any observed intermediate crystalline phases. [...]

The functionalization of surfaces with therapeutically applicable nucleic acid carriers provides promising strategies in biomedical research to develop therapies which focus on local nucleic acid delivery. One such approach is the embedding of lipoplexes (LPXs) in polysaccharide-based polyelectrolyte multilayers (PEMs). [...]

This document, written by early career researchers (ECRs) in particle physics, aims to represent the perspectives of the European ECR community and serves as input for the 2025--2026 update of the European Strategy for Particle Physics. With input from a community-wide survey, it highlights key challenges faced by ECRs -- career stability, funding access and long-term research opportunities -- while proposing policy recommendations and targeted initiatives. [...]

We present a methodology for extracting firn ice properties using S-parameter reflection coefficients (`$S_{11}$') of antennas lowered into boreholes. Coupled with Finite-Difference Time Domain (FDTD) simulations and calculations, a depth-dependent $S_{11}$ profile can be translated into a refractive index profile. [...]

We report observations of the ultra-high-energy gamma-ray source LHAASO J2108$+$5157, utilizing VERITAS, HAWC, Fermi-LAT, and XMM-Newton. VERITAS has collected $\sim$ 40 hours of data that we used to set ULs to the emission above 200 GeV. [...]

In September 2017, a high-energy neutrino event detected by the IceCube Neutrino Observatory (IceCube-170922A) was associated, at the $3σ$ level, with a gamma-ray flare from the blazar TXS 0506+056. Cosmic rays that are accelerated in astrophysical sources can escape from their jets and interact with background radiation fields. [...]

Microquasars have emerged as promising candidates to explain the cosmic-ray flux at petaelectronvolt energies. LHAASO observations revealed V4641~Sgr as the most extreme example so far. [...]

Volume 1 of the FCC Feasibility Report presents an overview of the physics case, experimental programme, and detector concepts for the Future Circular Collider (FCC). This volume outlines how FCC would address some of the most profound open questions in particle physics, from precision studies of the Higgs and EW bosons and of the top quark, to the exploration of physics beyond the Standard Model. [...]