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The Preprints collection aims to cover as far as possible all the grey literature in particle physics and its related technologies. The collection contains something like 400,000 documents, out of which about 50% can be accessed electronically. The documents originate from a variety of institutes all over the world. The collection, currently available, starts in 1979 and it has a full coverage of the arXiv.org e-Print archive since its beginning in 1991.
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2025-12-20
04:04
Probing scalar and pseudoscalar new physics using rare kaon decays / D'Ambrosio, G. (INFN, Naples) ; Iyer, A.M. (Indian Inst. Tech., New Delhi) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; ENS, Lyon, Lab. Phys.) ; Neshatpour, S. (IP2I, Lyon)
Rare kaon decays provide sensitive tests of new physics. [...]
CERN-TH-2025-254 ; arXiv:2512.16903. - 16.
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2025-12-20
04:03
Scalar damping in cosmological phase transitions / Ekstedt, Andreas (Uppsala U.) ; Konstandin, Thomas (DESY) ; van de Vis, Jorinde (CERN)
We outline how to calculate the scalar damping term during a cosmological phase transition from kinetic theory. [...]
DESY-25-195 ; CERN-TH-2025-262 ; arXiv:2512.16663. - 25.
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2025-12-20
04:03
Hadron Physics Opportunities at FAIR / Messchendorp, J.G. (Darmstadt, GSI) ; Nerling, F. (Darmstadt, GSI ; Frankfurt U., Inst. Kernphys.) ; Achenbach, P. (Jefferson Lab) ; Aichelin, J. (SUBATECH, Nantes ; Frankfurt U., FIAS) ; Albaladejo, M. (Valencia U., IFIC) ; An, L. (Peking U., SKLNPT) ; Aoki, K. (KEK, Tsukuba) ; Appagere, G. (Stockholm U. (main)) ; Baru, V. (Ruhr U., Bochum) ; Bashkanov, M. (York U., England) et al.
This White Paper outlines a coordinated, decade-spanning programme of hadron and QCD studies anchored at the GSI/FAIR accelerator complex. [...]
arXiv:2512.15986. - 281.
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2025-12-20
04:00
The Physics of Herwig 7 / Bellm, J. (Lund U.) ; Bewick, G. (Durham U., IPPP) ; Ferrario Ravasio, S. (Turin U. ; INFN, Turin) ; Gieseke, S. (KIT, Karlsruhe, TP) ; Grellscheid, D. (U. Bergen (main)) ; Kiebacher, S. (KIT, Karlsruhe, TP) ; Kirchgaeßer, P. (KIT, Karlsruhe, TP) ; Loshaj, F. (KIT, Karlsruhe, TP) ; Masouminia, M.R. (Durham U., IPPP) ; Nail, G. (U. Edinburgh (main)) et al.
We present the physics foundations and recent developments of Herwig 7, the modern successor of the original HERWIG and Herwig++ series. [...]
CERN-TH-2025-252 ; IPPP-25-57 ; HERWIG-2025-01 ; KA-TP-36-2025 ; MCNET-25-31 ; arXiv:2512.16645. - 195.
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2025-12-20
04:00
Charged black holes in the 1/N expansion / Obied, Georges (U. Oxford (main) ; U. Chicago (main)) ; Reig, Mario (Oxford U.(main) ; CERN)
We study some implications of $SU(N)\times U(1)$ theories coupled to gravity in the large-$N$ limit. [...]
CERN-TH-2025-256 ; arXiv:2512.15855. - 32.
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2025-12-19
16:51
Characterization of the quantum state of top quark pairs produced in proton-proton collisions at $ \sqrt{s}= $ 13 TeV using the beam and helicity bases
Measurements of the spin correlation coefficients in the beam basis are presented for top quark-antiquark ($ \mathrm{t} \overline{\mathrm{t}} $) systems produced in proton-proton collisions at $ \sqrt{s}= $ 13 TeV collected by the CMS experiment in 2016-2018, and corresponding to an integrated luminosity of 138 fb$ ^{-1} $. [...]
CERN-EP-2025-287 ; CMS-TOP-25-016-003. - 2025
Additional information for the analysis - CMS AuthorList - Fulltext

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2025-12-19
10:05
Performance of triple-GEM detectors for the ME0 system of the CMS Phase-2 Upgrade / Nenna, Felice (INFN, Bari ; Bari U.) ; Pellecchia, Antonello (INFN, Bari ; Bari U.) ; Verwilligen, Piet Omer J (INFN, Bari) /CMS Collaboration
The High-Luminosity LHC will deliver proton-proton collisions at 5-7.5 times the nominal LHC luminosity, with 140-200 pp-interactions per bunch crossing. To maintain the performance of muon triggering and reconstruction under high-rate background, the forward part of the CMS muon spectrometer will be upgraded with Gas Electron Multiplier (GEM) detectors. [...]
CMS-CR-2025-187.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;
In : 26th International Workshop on Radiation Imaging Detectors (IWORID 2025), Bratislava, Slovakia, 6 - 10 Jul 2025

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2025-12-19
04:25
Design and Performance of a 96-channel Resistive Micromegas Detector for ENUBET / Kallitsopoulou, A. (IRFU, Saclay) ; Aune, S. (IRFU, Saclay) ; Angelis, Y. (Aristotle U., Thessaloniki ; LMU Munich (main)) ; Aleksan, R. (IRFU, Saclay) ; Bonenfant, A. (IRFU, Saclay) ; Bortfeldt, J. (LMU Munich (main)) ; Brunbauer, F. (CERN) ; Brunoldi, M. (Pavia U. ; INFN, Pavia) ; Datta, J. (SUNY, Stony Brook) ; Desforge, D. (IRFU, Saclay) et al.
The PICOSEC-Micromegas (PICOSEC-MM) detector is a fast gaseous detector that achieves picosecond-level timing by coupling a Cherenkov radiator, typically an MgF2 crystal, to a Micromegas-based photodetector with a photocathode. [...]
arXiv:2512.05589. -
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2025-12-19
04:25
Directional dead-cone effect in QCD matter / Barata, João (CERN) ; Kuzmin, Matvey V. (Santiago de Compostela U., IGFAE) ; Mayo López, Xoán (Santiago de Compostela U., IGFAE ; MIT) ; Sadofyev, Andrey V. (Basque U., Bilbao ; LIP, Lisbon ; IKERBASQUE, Bilbao) ; Salgado, Carlos A. (Santiago de Compostela U., IGFAE)
We consider the propagation of heavy quarks through a dense, hydrodynamically flowing QCD medium, representative of the quark-gluon plasma formed in ultrarelativistic heavy-ion collisions. [...]
MIT-CTP/5964; CERN-TH-2025-237 ; arXiv:2512.11951. - 13.
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2025-12-19
04:24
Characterization of thin optical filters for high purity Cherenkov light readout from scintillating crystals / Benaglia, Andrea (INFN, Milan Bicocca) ; Cetorelli, Flavia (INFN, Milan Bicocca ; Milan Bicocca U.) ; Lucchini, Marco Toliman (INFN, Milan Bicocca ; Milan Bicocca U.) ; Auffray, Etiennette (CERN) ; Roux, Louis (CERN ; ILM, Lyon) ; Delenne, Julie (CERN ; Strasbourg, IPHC)
A hybrid dual-readout calorimeter concept, comprising both electromagnetic and hadronic sections, has recently been proposed to meet the performance requirements of experiments at future e$^{+}$e$^{-}$ colliders. [...]
arXiv:2512.04965. - 15.
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