OpenAccess

In our recent investigation, we utilized a century's worth of archival optical data to search for a decade-long periodicity from the blazar PG 1553+113, finding a hint of a 22-yr period. Building on this foundation, the current study extends our analysis to include 10 blazars from the Fermi-Large Area Telescope Second Catalog of Hard Sources (2FHL) catalogue to uncover similar long-term periodic behaviour. [...]

A wide variety of Galactic sources show transient emission at soft and hard X-ray energies: low- and high-mass X-ray binaries containing compact objects, isolated neutron stars exhibiting extreme variability as magnetars as well as pulsar-wind nebulae. Although most of them can show emission up to MeV and/or GeV energies, many have not yet been detected in the TeV domain by Imaging Atmospheric Cherenkov Telescopes. [...]

X-ray observations are essential for understanding the multimessenger emission mechanisms of active galactic nuclei (AGN). Blazars, a subset of AGN whose X-ray emission predominantly originates from relativistic jets, have been proposed as promising high-energy neutrino sources. [...]

Both ATLAS and CMS have recently performed the first searches for a heavy new spin-0 resonance decaying into a lighter new spin-0 resonance and a $Z$ boson, where the lighter spin-0 resonance subsequently decays into $t \bar t$ pairs. These searches are of particular interest to probe Two Higgs doublet model (2HDM) parameter space regions that predict a strong first-order electroweak phase transition. [...]

This note presents combined measurements of Higgs boson production and decay using up to 140 fb$^{-1}$ of proton-proton collision data collected by the ATLAS experiment at the LHC at $\sqrt{s} = 13$ TeV. The global signal strength is determined to be $1.023 ^{+0.056} _{-0.053}$. [...]

The ATLAS experiment at the Large Hadron Collider (LHC) iscurrently preparing to replace its present Inner Detector (ID) withthe upgraded, all-silicon Inner Tracker (ITk) for itsHigh-Luminosity upgrade (HL-LHC). The ITk will consist of acentral pixel tracker and the outer strip tracker, consisting ofabout 19,000 strip detector modules. [...]

This Letter presents the measurement of the energy-dependent neutrino-nucleon cross section in tungsten and the differential flux of muon neutrinos and antineutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy of 13.6 TeV and corresponding to an integrated luminosity of (65.6±1.4) fb-1. [...]

The enhancement of protective coating properties, especially hardness, can be achieved not only through alloying or grain refinement but also by introducing structural variations (gradients) throughout the thickness of the thin film material without altering its chemical composition. In this regard, hexagonal structured transition metal diborides, such as TiB$_{2±z}$ thin films, serve as a prime example exhibiting a hardness-anisotropy regarding their crystallographic orientation [...]

HNCS, isothiocyanic acid, and HNCO, isocyanic acid, are important molecules in the interstellar medium due to their composition of the essential atoms for organic life and their possible prebiotic role. They are assumed to be formed by dissociative recombination of their protonated versions, [H$_2$NCO]$^+$ and [H$_2$NCS]$^+$, where protonation may occur either on the N- or the O/S-atom [...]

Collider processes at the highest available partonic center-of-mass energies — 10 TeV and above — exhibit a new regime of electroweak interactions where electroweak gauge bosons mostly act as quasi-massless partons in vector boson fusion processes. We scrutinize these processes using the Equivalent Vector boson Approximation (EVA) based on its implementation in the Monte Carlo generator framework Whizard. [...]