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2025-11-05
04:14
Nucleosynthesis and CMB bounds on photophilic ALPs: a fresh look / Escudero, Miguel (CERN) ; Garcia-Perez, Clara (CERN ; Zaragoza U.) ; Ovchynnikov, Maksym (CERN)
We provide a fresh look at the cosmological constraints on axion-like particles (ALPs) that couple predominantly to photons, focusing on lifetimes $τ_{a} \lesssim 10^{4}\, {\rm s}$ and masses $m_a\lesssim 10\,{\rm GeV}$. [...]
CERN-TH-2025-222 ; arXiv:2511.00157. - 8.
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2025-11-05
04:11
opbasis - a Python package to derive minimal operator bases / Husung, Nikolai (CERN ; Madrid, IFT ; Madrid, Autonoma U.)
Finding a complete and yet minimal on-shell basis of operators of a given mass-dimension that are compatible with a specific set of transformation properties is the first step in any Effective Field Theory description. [...]
CERN-TH-2025-223 ; IFT-UAM/CSIC-25-138 ; arXiv:2511.00165. - 23.
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2025-11-05
04:02
Precision lattice calculation of the hadronic contribution to the running of the electroweak gauge couplings / Conigli, Alessandro (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; Djukanovic, Dalibor (Helmholtz Inst., Mainz ; Darmstadt, GSI) ; von Hippel, Georg (U. Mainz, PRISMA) ; Kuberski, Simon (CERN) ; Meyer, Harvey B. (Helmholtz Inst., Mainz ; U. Mainz, PRISMA ; CERN) ; Miura, Kohtaroh (KEK, Tsukuba) ; Ottnad, Konstantin (U. Mainz, PRISMA) ; Risch, Andreas (Wuppertal U.) ; Wittig, Hartmut (Helmholtz Inst., Mainz ; Darmstadt, GSI ; U. Mainz, PRISMA)
We present an update of our lattice QCD determination of the hadronic contribution to the running of the electromagnetic coupling, $Δα_{\mathrm{had}}^{(5)}(-Q^2)$, and of the electroweak mixing angle in the space-like momentum region up to $Q^2=12\ \mathrm{GeV}^2$. [...]
CERN-TH-2025-216 ; MITP-25-069 ; KEK-TH-2771 ; arXiv:2511.01623. - 59.
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2025-11-04
06:02
A Generalisable Generative Model for Multi-Detector Calorimeter Simulation / Raikwar, Piyush (CERN) ; Zaborowska, Anna (CERN) ; McKeown, Peter (CERN) ; Cardoso, Renato (CERN) ; Piorczynski, Mikolaj (Warsaw U. of Tech. (main)) ; Yeo, Kyongmin (IBM Watson Res. Ctr.)
Collider experiments, such as those at the Large Hadron Collider, use the Geant4 toolkit to simulate particle-detector interactions with high accuracy. [...]
arXiv:2509.07700. - 2025 - 31.
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2025-11-04
06:01
Automated computation of spin-density matrices and quantum observables for collider physics / Durupt, Valentin (Louvain U., CP3) ; Maltoni, Fabio (Louvain U., CP3 ; Bologna U. ; INFN, Bologna ; CERN) ; Mattelaer, Olivier (Louvain U., CP3)
We present a fully automated framework to compute production spin-density matrices for generic collider processes at tree level within \textsc{MadGraph5\_aMC@NLO}. [...]
IRMP-CP3-25-34 ; arXiv:2510.17730. - 2025 - 71.
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2025-11-04
06:01
Probing the Chern-Simons Portal at the HL-LHC through Displaced Vertices from W Boson Associated Production / Nourbakhsh, Mohammad (IPM, Tehran) ; Mohammadi Najafabadi, Mojtaba (IPM, Tehran ; CERN)
This study explores the Chern-Simons portal model, an extension of the Standard Model that introduces a massive neutral vector boson $X$ associated with a $U_X(1)$ gauge symmetry. [...]
arXiv:2509.04031. - 2025 - 19.
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2025-11-04
06:01
Hidden simplicity in the scattering for neutron stars and black holes / Aoude, Rafael (U. Edinburgh, Higgs Ctr. Theor. Phys.) ; Helset, Andreas (CERN)
Heavy particle effective theory applied to spinning black holes provides a natural framework in which propagators linearize and numerators exponentiate. [...]
arXiv:2509.04425. - 2025 - 5.
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2025-11-04
06:01
Afterpulse prediction for SUBMET experiment / Campagnari, Claudio (UC, Santa Barbara) ; Cho, Sungwoong (Korea U.) ; Choi, Suyong (Korea U.) ; Chung, Seokju (Korea U.) ; Citron, Matthew (Korea U. ; UC, Davis) ; De Los Santos, Ryan (Ohio State U.) ; De Roeck, Albert (CERN) ; Gastal, Martin (CERN) ; Ha, Seungkyu (Korea U.) ; Haas, Andy (New York U.) et al.
The SUB-Millicharge ExperimenT (SUBMET) investigates an unexplored parameter space of millicharged particles with mass $m_χ< $ 1.6 GeV/c$^2$ and charge $Q_χ< 10^{-3}e$. [...]
arXiv:2510.19724. - 2025 - 13.
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2025-11-04
06:01
Rapid event extraction and tensorial event adaption: Libraries for efficient access and generic reweighting of parton-level events and their implementation in the MadtRex module / Roiser, Stefan (CERN) ; Schöfbeck, Robert (Vienna, OAW) ; Wettersten, Zenny (CERN ; Vienna, OAW)
We present Rex and teaRex, C++17 libraries for efficient management of parton-level hard scattering event information and completely generic reweighting of such events, respectively. [...]
arXiv:2510.05100. - 2025 - 34.
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2025-11-04
06:01
New GPU developments in the Madgraph CUDACPP plugin: kernel splitting, helicity streams, cuBLAS color sums / Valassi, Andrea (CERN)
The first production release of the CUDACPP plugin for the Madgraph5_aMC@NLO generator, which speeds up matrix element (ME) calculations for leading-order (LO) QCD processes using a data parallel approach on vector CPUs and GPUs, was delivered in October 2024. [...]
arXiv:2510.05392. - 2025 - 18.
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