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2025-12-17
13:49
Search for heavy neutral leptons in B-meson decays
A search for long-lived heavy neutral leptons produced in B-meson decays and decaying to a $\mu^\pm \pi^\mp$ final state is performed with data collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of 13 TeV, corresponding to an integrated luminosity of $5\,\mathrm{fb}^{-1}$. [...]
CERN-EP-2025-264 ; arXiv:2512.14551 ; LHCB-PAPER-2025-042. - 2025
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2025-12-17
04:44
The heavy quark-antiquark asymmetry in the variable flavor number scheme / Behring, A. (Garching, Max Planck Inst.) ; Blümlein, J. (DESY ; Dortmund U.) ; De Freitas, A. (Linz U., RISC) ; von Manteuffel, A. (Regensburg U.) ; Schneider, C. (Linz U., RISC) ; Schönwald, K. (CERN)
The twist-2 heavy-quark and antiquark distributions, as defined in the variable flavor number scheme, turn out to be different due to QCD corrections from three-loop onward. [...]
DESY 25-185 ; CERN-TH-2025-259 ; MPP-2025-227 ; RISC Report series 25-10 ; arXiv:2512.13508. - 17.
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2025-12-17
04:41
Investigating a two-level algorithm for fermionic observables / Barca, Lorenzo (NIC, Zeuthen) ; Schaefer, Stefan (NIC, Zeuthen) ; Finkenrath, Jacob (Wuppertal U. ; CERN)
We investigate the combination of a two-level sampling algorithm with distillation techniques to compute disconnected fermionic correlation functions. [...]
DESY-25-184; CERN-TH-2025-249 ; arXiv:2512.10644. - 28.
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2025-12-17
04:39
Measurement of differential $t$-channel production cross-sections of single top quarks and top antiquarks at $\sqrt{s}=13$ TeV with the ATLAS detector / Kretschmann, Lukas (Wuppertal U.)
The differential production cross-sections of single top quarks and top antiquarks produced via the $t$-channel process are measured in proton-proton collisions at $\sqrt{s}=13$ TeV at the LHC with the full Run 2 ATLAS dataset corresponding to an integrated luminosity of $140$ fb$^{-1}$. [...]
arXiv:2512.09379. - 6.
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2025-12-16
04:05
Constraints on light QCD and CP-violating axions from the death line of rotation-powered pulsars / Witte, Samuel J. (U. Oxford (main) ; DESY ; U. Hamburg (main)) ; Caputo, Andrea (CERN ; U. Rome La Sapienza (main) ; Weizmann Inst.) ; Stelzl, Stefan (Ecole Polytechnique, Lausanne ; Barcelona, IFAE) ; Chernoglazov, Alexander (Princeton, Inst. Advanced Study) ; Philippov, Alexander A. (Maryland U.) ; Rajendran, Surjeet (Johns Hopkins U.)
For axions that couple to nucleons, the presence of dense nuclear matter can displace the axion from its vacuum minimum, sourcing large field gradients around neutron stars (and, more generally, compact objects). [...]
DESY-25-111 ; CERN-TH-2025-251 ; arXiv:2512.11023. - 60.
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2025-12-15
16:44
Mechanical Design and Integration of the CMS Phase-2 Tracker / Rose, Pierre (CERN) /CMS Collaboration
The mechanical design of the CMS Phase-2 Tracker addresses the stringent requirements imposed by the High Luminosity LHC environment, including stability under high radiation and thermal loads, a minimal material budget, and precise alignment across large detector volumes. This article describes the engineering challenges and the mechanical solutions implemented in both the Inner Tracker and the Outer Tracker. [...]
CMS-CR-2025-294.- Geneva : CERN, 2025 - 9 p. Fulltext: PDF;
In : 33rd International Workshop on Vertex Detectors (VERTEX 2025), Knoxville, Tennessee, United States, 25 - 29 Aug 2025

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2025-12-13
04:37
Modeling Light Signals Using Data from the First Pulsed Neutron Source Program at the DUNE Vertical Drift ColdBox Test Facility at CERN Neutrino Platform / Paudel, A. (Fermilab) ; Shi, W. (SUNY, Stony Brook) ; Sala, P. (Fermilab) ; Cavanna, F. (Fermilab) ; Johnson, W. (South Dakota Sch. Mines Tech.) ; Wang, J. (South Dakota Sch. Mines Tech.) ; Ketchum, W. (Fermilab) ; Resnati, F. (CERN) ; Heindel, A. (SUNY, Stony Brook) ; Ashkenazi, A. (Tel Aviv U.) et al.
In this paper, we present a first quantitative test of detected light signals produced in a pulsed neutron source run in a small vertical drift LArTPC at the CERN neutrino platform ColdBox test facility. [...]
arXiv:2512.10790 ; FERMILAB-PUB-25-0856-LBNF. - 16.
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2025-12-13
04:34
Hiding a Light Vector Boson from Terrestrial Experiments: A Chargephobic Dark Photon / Esseili, Haidar (Oregon U.) ; Kribs, Graham D. (Oregon U. ; CERN)
We calculate the terrestrial, astrophysical and cosmological constraints on a light vector boson that couples to an arbitrary combination of the electromagnetic and $B-L$ currents of the Standard Model. [...]
CERN-TH-2025-242 ; arXiv:2512.10916. - 54.
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2025-12-13
04:12
Conformal collider bootstrap in ${\mathcal N}=4$ SYM / Dempsey, Ross (MIT) ; Karlsson, Robin (Oxford U., Inst. Math.) ; Pufu, Silviu S. (Princeton U. (main)) ; Zahraee, Zahra (Perimeter Inst. Theor. Phys.) ; Zhiboedov, Alexander (CERN)
We use a combination of perturbation theory, holography, supersymmetric localization, integrability, and numerical conformal bootstrap methods to constrain the energy-energy correlator in $\text{SU}(N_c)$${\mathcal N}=4$ SYM at finite coupling. [...]
CERN-TH-2025-212 ; MIT-CTP/5979 ; PUPT-2659 ; arXiv:2512.10796. - 97.
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2025-12-13
04:04
Nonlocal form factor of chromomagnetic penguin in $B\to K\ell^+\ell^-$ from QCD light-cone sum rules / Hurth, T. (U. Mainz, PRISMA) ; Khodjamirian, A. (Siegen U.) ; Mahmoudi, F. (IP2I, Lyon ; CERN ; IUF, Paris) ; Mishra, D. (IP2I, Lyon) ; Monceaux, Y. (IP2I, Lyon) ; Neshatpour, S. (IP2I, Lyon)
The branching fraction of the $B \to K\ell^+\ell^-$ decay has been measured recently by the LHC experiments, showing a deviation from theory predictions based on the Standard Model (SM). [...]
CERN-TH-2025-253 ; MITP-25-076 ; SI-HEP-2025-28 ; P3H-25-109 ; arXiv:2512.10868. - 36.
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