Preprints

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2024-11-01
10:52
arXiv [PUBDB-2024-06574] Preprint
; ; ; et al
Measurements of $WH$ and $ZH$ production with Higgs boson decays into bottom quarks and direct constraints on the charm Yukawa coupling in $13\,\mathrm{TeV}$$pp$ collisions with the ATLAS detector
[CERN-EP-2024-237; arXiv:2410.19611]
 GO
A study of the Higgs boson decaying into bottom quarks ($H \to b\bar{b}$) and charm quarks ($H \to c\bar{c}$) is performed, in the associated production channel of the Higgs boson with a $W$ or $Z$ boson, using $140\,\mathrm{fb}^{-1}$ of proton-proton collision data at $\sqrt{s} = 13\,\mathrm{TeV}$ collected by the ATLAS detector. The individual production of $WH$ and $ZH$ with $H \to b\bar{b}$ is established with observed (expected) significances of $5.3$ ($5.5$) and $4.9$ ($5.6$). [...]
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2024-10-30
14:46
OpenAccess [PUBDB-2024-06564] Preprint
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Nonlinear Feedback of the Electrostatic Instability on the Blazar-induced Pair Beam and GeV Cascade
[DESY-23-211; arXiv:2402.03127]
Relativistic pair beams produced in the cosmic voids by TeV gamma-rays from blazars are expected to produce a detectable GeV-scale cascade that is missing in the observations. The suppression of this secondary cascade implies either the deflection of the pair beam by intergalactic magnetic fields or, alternatively, an energy loss of the beam due to the beam-plasma instability. [...]
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2024-10-29
14:15
arXiv [PUBDB-2024-06559] Preprint
; ; ; et al
Fermi-LAT follow-up observations in seven years of real-time high-energy neutrino alerts
[arXiv:2401.06666]
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The realtime program for high-energy neutrino track events detected by the IceCube South Pole Neutrino Observatory releases alerts to the astronomical community with the goal of identifying electromagnetic counterparts to astrophysical neutrinos. Gamma-ray observations from the Fermi-Large Area Telescope (LAT) enabled the identification of the flaring gamma-ray blazar TXS 0506+056 as a likely counterpart to the neutrino event IC-170922A [...]
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2024-10-29
13:52
OpenAccess [PUBDB-2024-06558] Preprint
; ; ; et al
CTC and CT5TEA: An advanced multi-channel digitizer and trigger ASIC for imaging atmospheric Cherenkov telescopes
[arXiv:2409.06435]
We have developed a new set of Application-Specific Integrated Circuits (ASICs) of the TARGET family (CTC and CT5TEA), designed for the readout of signals from photosensors in cameras of Imaging Atmospheric Cherenkov Telescopes (IACTs) for ground-based gamma-ray astronomy. We present the performance and design details. [...]
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2024-10-29
13:02
OpenAccess [PUBDB-2024-06552] Preprint

Sources of high-energy astrophysical neutrinos
[arXiv:2402.19314]
We discuss recent results in neutrino astronomy and their implications for the cosmic-ray acceleration in relativistic outflows, such as in Active Galactic Nuclei (AGN) jets, Gamma-Ray Bursts (GRBs), and Tidal Disruption Events (TDEs). We especially focus on challenges at the interface to particle acceleration which can be inferred from the multi-messenger context, such as the paradigm that the sources power the Ultra-High-Energy Cosmic Rays (UHECRs). [...]
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2024-10-29
12:56
OpenAccess [PUBDB-2024-06551] Preprint
; ; ; et al
Search for displaced leptons in $\sqrt{s}=13$ TeV and $13.6$ TeV $pp$ collisions with the ATLAS detector
[CERN-EP-2024-257; arXiv:2410.16835]
A search for leptons displaced from the primary vertex is performed with the ATLAS detector at the Large Hadron Collider. The search includes the full proton-proton collision dataset collected during Run 2 at $\sqrt{s}=13$ TeV and a partial dataset collected during Run 3 in 2022-2023 at $\sqrt{s}=13.6$ TeV, corresponding to integrated luminosities of 140 fb$^{-1}$ and 56.3 fb$^{-1}$, respectively. [...]
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2024-10-29
12:55
OpenAccess [PUBDB-2024-06550] Preprint
; ; ; et al
Search for a new scalar decaying into new spin-1 bosons in four-lepton final states with the ATLAS detector
[CERN-EP-2024-248; arXiv:2410.16781]
A search is conducted for a new scalar boson $S$, with a mass distinct from that of the Higgs boson, decaying into four leptons ($\ell =$$e$, $\mu$) via an intermediate state containing two on-shell, promptly decaying new spin-1 bosons $Z_\text{d}$: $S \rightarrow Z_\text{d}Z_\text{d} \rightarrow 4\ell$, where the $Z_\text{d}$ boson has a mass between 15 and 300 GeV, and the $S$ boson has a mass between either 30 and 115 GeV or 130 and 800 GeV. The search uses proton-proton collision data collected with the ATLAS detector at the Large Hadron Collider with an integrated luminosity of 139 fb$^{-1}$ at a centre-of-mass energy of $\sqrt{s}=13$ TeV. [...]
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2024-10-29
12:53
OpenAccess [PUBDB-2024-06549] Preprint
; ; ; et al
Search for supersymmetry in final states with missing transverse momentum and charm-tagged jets using 139 fb$^{-1}$ of proton-proton collisions at $\sqrt{s}=$ 13 TeV with the ATLAS detector
[CERN-EP-2024-218; arXiv:2410.17824]
The paper presents a search for supersymmetric particles produced in proton-proton collisions at $\sqrt{s}=$ 13 TeV and decaying into final states with missing transverse momentum and jets originating from charm quarks. The data were taken with the ATLAS detector at the Large Hadron Collider at CERN from 2015 to 2018 and correspond to an integrated luminosity of 139 fb$^{-1}$. [...]
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2024-10-29
12:40
OpenAccess [PUBDB-2024-06546] Preprint
; ; ; et al
TELAMON: Effelsberg monitoring of AGN jets with very-high-energy astroparticle emission - I. Program description and sample characterization
[arXiv:2401.06296]
Aims. We introduce the TELAMON program which is using the Effelsberg 100-m telescope to monitor the radio spectra of active galactic nuclei (AGN) under scrutiny in astroparticle physics, specifically TeV blazars and candidate neutrino-associated AGN. [...]
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2024-10-28
15:33
OpenAccess [PUBDB-2024-06535] Preprint
; ; ; et al
AM$^3$: An Open-Source Tool for Time-Dependent Lepto-Hadronic Modeling of Astrophysical Sources
[arXiv:2312.13371]
We present the AM$^3$ (``Astrophysical Multi-Messenger Modeling'') software, which has been successfully used in the past to simulate the multi-messenger emission, including neutrinos, from active galactic nuclei, including the blazar sub-class, gamma-ray bursts, and tidal disruption events. AM$^3$ is a documented state-of-the-art open source software that efficiently solves the coupled integro-differential equations for the spectral and temporal evolution of the relevant particle densities (photons, electrons, positrons, protons, neutrons, pions, muons, and neutrinos). [...]
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