CERN Preprints

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2025-03-08
04:49

Machine learning in top quark physics at ATLAS and CMS / Komm, Matthias (DESY)
This note presents an overview of machine-learning-based techniques used in the study of the top quark. [...]
arXiv:2503.04289. - 6.
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2025-03-07
04:19

Radiation Testing of New Readout Electronics for the CMS ECAL Barrel / Härringer, Nico ; Dissertori, Günther ; Gadek, Tomasz ; Hajdas, Wojciech ; Haller, Christian ; Loukas, Nikitas ; Lustermann, Werner ; Morvaj, Ljiljana ; Singovski, Alexander ; Stachon, Krzysztof
In preparation of the operation of the CMS electromagnetic calorimeter (ECAL) barrel at the High Luminosity Large Hadron Collider (HL-LHC) the entire on-detector electronics will be replaced. [...]
arXiv:2503.03362. - 7.
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2025-03-07
04:17

Large charge meets semiclassics in $\mathcal{N}=4$ super Yang-Mills / Brown, Augustus (Queen Mary, U. of London) ; Galvagno, Francesco (Queen Mary, U. of London) ; Grassi, Alba (U. Geneva (main)) ; Iossa, Cristoforo (U. Geneva (main)) ; Wen, Congkao (Queen Mary, U. of London)
We study the large-charge sector of $\mathcal{N}=4$ super Yang-Mills theory (SYM) with $SU(N)$ gauge group by constructing a special class of half-BPS heavy operators, termed "canonical operators". [...]
CERN-TH-2025-016 ; QMUL-PH-25-03 ; arXiv:2503.02028. - 49.
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2025-03-06
07:02

Branching fraction measurement of the decay $B^+ \to \psi(2S) \phi(1020) K^+$ / LHCb Collaboration
The branching fraction of the decay $B^+\to \psi(2S)\phi(1020)K^+$, relative to the topologically similar decay $B^+\to J/\psi \phi(1020) K^+$, is measured using proton-proton collision data collected by the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV, corresponding to an integrated luminosity of $9\,\mathrm{fb}^{-1}$. [...]
arXiv:2503.02711 ; LHCb-PAPER-2024-039 ; CERN-EP-2025-011. - 22.
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2025-03-06
06:37

Curvature Perturbations from First-Order Phase Transitions: Implications to Black Holes and Gravitational Waves / Franciolini, Gabriele (CERN) ; Gouttenoire, Yann (Tel Aviv U. ; U. Mainz, PRISMA ; Mainz U., Inst. Phys.) ; Jinno, Ryusuke (Kobe U.)
We employ a covariant formalism to study the evolution of cosmological perturbations during a first-order phase transition, addressing in particular their gauge dependence that have been overlooked so far. [...]
arXiv:2503.01962. - 7.
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2025-03-06
06:12

Di-decay signature of new physics particles at intensity frontier experiments / Dalla Valle Garcia, Giovani (KIT, Karlsruhe, IAP) ; Ovchynnikov, Maksym (CERN)
We explore the potential of intensity frontier experiments to search for unstable feebly interacting particles (FIPs) via signatures that offer deeper insights than the standard signature of a single FIP decay. [...]
arXiv:2503.01760. - 19.
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2025-03-06
05:43

Luminosity measurement for lead-lead collisions at $ \sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}= $ 5.02 TeV in 2015 and 2018 at CMS / CMS Collaboration
Measurements of the luminosity delivered to the CMS experiment during the lead-lead data-taking periods in 2015 and 2018 are presented for the first time. [...]
CMS-LUM-20-002 ; CERN-EP-2025-018 ; arXiv:2503.03946 ; CMS-LUM-20-002-003. - 2025
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2025-03-05
15:21