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Branching fractions of $\eta$ and $\eta’(958)$ anomalous decays at LHCb /LHCb Collaboration
Branching fractions of $\eta$ and $\eta’(958)$ anomalous decays are measured using $pp$ collision data at a center-of-mass energy of $\sqrt{s}=13\,\mathrm{TeV}$ collected by the LHCb experiment and corresponding to an integrated luminosity of $5.4\,\mathrm{fb^{-1}}$. The measured values and upper limits at the 90% confidence level are \begin{equation} \mathcal{B}(\eta\to\mu^+\mu^-) = (5.30\pm0.14_{\text{(stat)}}\pm0.18_{\text{(syst)}}\pm0.26_{\phi})\times10^{-6} \nonumber, \end{equation} \begin{equation} \mathcal{B}(\eta’(958)\to\mu^+\mu^-)<1.94\times10^{-7} \nonumber, \end{equation} \begin{equation} \mathcal{B}(\eta\to\pi^+\pi^-\mu^+\mu^-)<6\times10^{-7} \nonumber, \end{equation} \begin{equation} \mathcal{B}(\eta’(958)\to\pi^+\pi^-\mu^+\mu^-) = (2.80\pm0.14_{\text{(stat)}}\pm0.13_{\text{(syst)}}\pm0.14_{\phi})\times10^{-5} \nonumber, \end{equation} where the first uncertainty is statistical, the second is systematic, and the third is the uncertainty associated with the branching fraction of the $\phi\to\mu^+ \mu^-$ decay which is used for normalization. [...]
LHCb-CONF-2025-002; CERN-LHCb-CONF-2025-002.- Geneva : CERN, 2025 Fulltext: LHCb-CONF-2025-002 - PDF; LHCb-CONF-2025-002_Figures - ZIP;
In : 13th International Workshop on the CKM Unitarity Triangle, Cagliari, It, 15 - 19 Sep 2025

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Corfu2025 Workshop on the Standard Model and Beyond - Corfu2025 SM and Beyond 24 Aug - 3 Sep 2025 - Corfu, Gr .-
2025

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14th International Conference on New Frontiers in Physics 2025 (ICNFP 2025) - ICNFP 2025 17 - 31 Jul 2025 - Kolymbari, Crete, Gr .-
2025

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Measurement of high-mass $t\bar{t}\ell^{+}\ell^{-}$ production and lepton flavour universality-inspired effective field theory interpretations at $\sqrt{s}=13$ TeV with the ATLAS / ATLAS Collaboration
Measurements of $t\bar{t}\ell^{+}\ell^{-}$ production in the region of high dilepton invariant mass with effective field theory (EFT) interpretations are presented. [...]
arXiv:2504.05919 ; CERN-EP-2025-053. - 2025 - 52.
Fulltext - Previous draft version - Fulltext

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Projections for Key Measurements in Heavy Flavour Physics
Precision studies of flavour-changing processes involving quarks and leptons provide a number of ways to improve knowledge of the Standard Model and search for physics beyond it. [...]
ATL-PHYS-PUB-2025-020 ; CMS-BPH-25-001 ; LHCb-PUB-2025-008 ; Belle II Preprint 2025-007 ; Belle II Preprint 2025-007 ; KEK Preprint 2025-5 ; arXiv:2503.24346 ; CERN-LHCb-PUB-2025-008 ; CERN-ATL-PHYS-PUB-2025-020 ; CERN-CMS-BPH-25-001. - 2025 - 11.
Original Communication (restricted to ATLAS) - Full text - Full text

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Search for the $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ decay / LHCb Collaboration
A search for the decay $B^+_c\rightarrow \chi_{c1}(3872)\pi^+$ is reported using proton-proton collision data collected with the LHCb detector between 2011 and 2018 at centre-of-mass energies of 7, 8, and 13 $TeV$, corresponding to an integrated luminosity of $9fb^{-1}$. [...]
arXiv:2503.20039 ; CERN-EP-2025-042 ; LHCb-PAPER-2024-050 ; LHCB-PAPER-2024-050. - 2025 - 29.
Fulltext - Related data file(s) - Supplementary information - Fulltext

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13th International Conference on Kaon Physics - KAON 2025 8 - 12 Sep 2025 - Mainz, De .-
2025

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Computing and software for LHCb Upgrade II
A second major upgrade of the LHCb experiment is necessary to allow full exploitation of the High Luminosity LHC for flavour physics. The new experiment will operate in Run 5 of the LHC at a luminosity up to $1.5\times 10^{34}cm^{-2}s^{-1}$. [...]
LHCb-PUB-2025-004; CERN-LHCb-PUB-2025-004.- Geneva : CERN, 2025 Fulltext: PDF;

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Technology developments for LHCb Upgrade II / LHCb Collaboration, CERN
A major LHCb detector upgrade will be installed during long shutdown~4 (LS4) of the CERN Large Hadron Collider. The experiment will operate at a maximum luminosity of up to $1.5\times 10^{34} cm^{-2}\sec^{-1}$, with acceptance covering a pseudorapidity range close to the beamline. [...]
LHCb-PUB-2025-002; CERN-LHCb-PUB-2025-002.- Geneva : CERN, 2025 Fulltext: PDF;

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10.

Discovery potential of LHCb Upgrade II / LHCb Collaboration, CERN
A second major upgrade of the LHCb detector is necessary to allow full exploitation of the HL-LHC for flavour physics. The new detector will be installed during long shutdown 4 (LS4), and will operate at instantaneous luminosity up to $1.5 \times 10^{34}\,{\rm cm}^{-2}{\rm s}^{-1}$. [...]
LHCb-PUB-2025-001; CERN-LHCb-PUB-2025-001.- Geneva : CERN, 2025 Fulltext: PDF;

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