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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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