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Measurement of the branching fraction ratios $R(D^+)$ and $R(D^{*+})$ using muonic $\tau$ decays / LHCb Collaboration
The branching fraction ratios of $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^+\tau^-\overline{\nu}_{\tau}$ and $\kern 0.18em \overline{\kern -0.18em B}{}^0\to D^{*+}\tau^-\overline{\nu}_{\tau}$ decays are measured with respect to their muonic counterparts, using a data sample corresponding to an integrated luminosity of 2.0 fb$^{-1}$ collected by the LHCb experiment in proton-proton collisions at $\sqrt{s} = 13\,\text{TeV}$. [...]
arXiv:2406.03387 ; LHCb-PAPER-2024-007 ; CERN-EP-2024-125 ; LHCB-PAPER-2024-007. - 2024 - 22.
Fulltext - Related data file(s) - Supplementary information - Fulltext

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First search for $K^+ \to \pi^0 \pi \mu e$ decays / NA62 Collaboration
The first search for the lepton number violating decay $K^+ \to \pi^0 \pi^- \mu^+ e^+$ and lepton flavour violating decays $K^+ \to \pi^0 \pi^+ \mu^- e^+$, $K^+ \to \pi^0 \pi^+ \mu^+ e^-$ has been performed using a dataset collected by the NA62 experiment at CERN in 2016–2018. Upper limits of $2.9\times 10^{-10}$, $3.1 \times 10^{-10}$ and $5.0 \times 10^{-10}$, respectively, are obtained at 90% CL for the branching ratios of the three decays on the assumption of uniform phase-space distributions..
arXiv:2409.12981; CERN-EP-2024-224.- Geneva : CERN, 2024-11-12 - 9 p. - Published in : Phys. Lett. B 859 (2024) 139122 Draft (restricted): PDF; Fulltext: CERN-EP-2024-224 - PDF; 2409.12981 - PDF; Publication - PDF;

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Search for the lepton-flavor violating decay $B_s^0\to \phi \mu^\pm \tau^\mp$ / LHCb Collaboration
A search for the lepton-flavor violating decays $B^0_s\to\phi\mu^\pm\tau^\mp$ is presented, using a sample of proton-proton collisions at center-of-mass energies of 7, 8, and 13 TeV, collected with the LHCb detector and corresponding to a total integrated luminosity of $9\,\text{fb}^{-1}$. The $\tau$ leptons are selected using decays with three charged pions. [...]
arXiv:2405.13103; LHCb-PAPER-2024-006; CERN-EP-2024-114.- Geneva : CERN, 2024-10-01 - 12 p. - Published in : Phys. Rev. D 110 (2024) 072014 Fulltext: LHCb-PAPER-2024-006 - PDF; Publication - PDF; 2405.13103 - PDF; Related data file(s): ZIP;

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CPT and Lorentz symmetry tests with hydrogen using a novel in-beam hyperfine spectroscopy method applicable to antihydrogen experiments / Nowak, Lilian ; Malbrunot, Chloé ; Simon, Martin C. ; Amsler, Claude ; Arguedas Cuendis, Sergio ; Lahs, Sebastian ; Lanz, Andreas ; Nanda, Amit ; Wiesinger, Markus ; Wolz, Tim et al. /Asacusa AD-3
We present a Rabi-type measurement of two ground-state hydrogen hyperfine transitions performed in two opposite external magnetic field directions. This puts first constraints at the level of 2.3 × 10^{−21} GeV on a set of coefficients of the Standard Model Extension, which were not measured by previous experiments. [...]
CERN-EP-2024-089.- Geneva : CERN, 2024 - 9. Draft (restricted): PDF; Fulltext: PDF;

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Precise test of lepton flavour universality in $W$-boson decays into muons and electrons in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector / ATLAS Collaboration
The ratio of branching ratios of the $W$ boson to muons and electrons, $R^{\mu/e}_W=B(W\rightarrow \mu\nu)/B(W\rightarrow e\nu)$, has been measured using 140 fb$^{-1}$ of $pp$ collision data at $\sqrt{s}=13$ TeV collected with the ATLAS detector at the LHC, probing the universality of lepton couplings. The ratio is obtained from measurements of the $t\bar{t}$ production cross-section in the $ee$, $e\mu$ and $\mu\mu$ dilepton final states. [...]
arXiv:2403.02133; CERN-EP-2024-063.- Geneva : CERN, 2024-10-01 - 33 p. - Published in : Eur. Phys. J. C 84 (2024) 993 Fulltext: document - PDF; 2403.02133 - PDF; Publication - PDF; External link: Previous draft version

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A search for the $K^+ \to \mu^- \nu e^+ e^+$ decay / NA62 Collaboration
A search for the $K^+ \to \mu^- \nu e^+ e^+$ decay forbidden within the Standard Model by either lepton number or lepton flavour conservation depending on the flavour of the emitted neutrino, has been performed using the dataset collected by the NA62 experiment at CERN in 2016–2018. An upper limit of $8.1 \times 10^{-11}$ is obtained for the decay branching fraction at 90% CL, improving by a factor of 250 over the previous search..
arXiv:2211.04818; CERN-EP-2022-243.- Geneva : CERN, 2023-03-10 - 12 p. - Published in : Phys. Lett. B 838 (2023) 137679 Draft (restricted): PDF; Fulltext: 2211.04818 - PDF; Publication - PDF; CERN-EP-2022-243 - PDF;

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Observation of the decay $ \Lambda_b^0\rightarrow \Lambda_c^+\tau^-\overline{\nu}_{\tau}$ / LHCb Collaboration
The first observation of the semileptonic $b$-baryon decay $ \Lambda_b^0 \rightarrow \Lambda_c^+ \tau^-\overline{\nu}_{\tau}$, with a significance of $6.1\,\sigma$, is reported using a data sample corresponding to 3 fb$^{-1}$ of integrated luminosity, collected by the LHCb experiment at centre-of-mass energies of 7 and 8~TeV at the LHC. The $\tau^-$ lepton is reconstructed in the hadronic decay to three charged pions. [...]
arXiv:2201.03497; LHCb-PAPER-2021-044; CERN-EP-2021-265; LHCB-PAPER-2021-044.- Geneva : CERN, 2022-05-13 - 21 p. - Published in : Phys. Rev. Lett. 128 (2022) 191803 Fulltext: 2201.03497 - PDF; PhysRevLett.128.191803 - PDF; Related data file(s): ZIP; Supplementary material: ZIP;

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Searches for lepton number violating $K^+\to\pi^-(\pi^0)e^+e^+$ decays / NA62 Collaboration
Searches for lepton number violating $K^+\to\pi^-e^+e^+$ and $K^+\to\pi^-\pi^0e^+e^+$ decays have been performed using the complete dataset collected by the NA62 experiment at CERN in 2016-2018. Upper limits of $5.3\times 10^{-11}$ and $8.5\times 10^{-10}$ are obtained on the decay branching fractions at 90% confidence level. [...]
arXiv:2202.00331; CERN-EP-2022-018.- 2022-07-10 - 16 p. Draft (restricted): PDF; Fulltext: 2202.00331 - PDF; CERN-EP-2022-018 - PDF;

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Constraints on Higgs boson properties using $WW^{*}(\rightarrow e\nu \mu \nu )jj$ production in $36.1\,\mathrm{fb}^{-1}$ of $\sqrt{s}=13$ TeV pp collisions with the ATLAS detector / ATLAS Collaboration
This article presents the results of two studies of Higgs boson properties using the $WW^*(\rightarrow e\nu\mu\nu)jj$ final state, based on a dataset corresponding to 36.1 fb$^{-1}$ of $\sqrt{s}=13$ TeV proton-proton collisions recorded by the ATLAS experiment at the Large Hadron Collider. The first study targets Higgs boson production via gluon-gluon fusion and constrains the CP properties of the effective Higgs-gluon interaction. [...]
arXiv:2109.13808; CERN-EP-2021-096.- Geneva : CERN, 2022-07-18 - 47 p. - Published in : Eur. Phys. J. C 82 (2022) 622 Fulltext: 2109.13808 - PDF; document - PDF; External link: Previous draft version

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10.

Test of lepton universality in beauty-quark decays / LHCb Collaboration
The Standard Model of particle physics currently provides our best description of fundamental particles and their interactions. The theory predicts that the different charged leptons, the electron, muon and tau, have identical electroweak interaction strengths. [...]
arXiv:2103.11769; LHCb-PAPER-2021-004; CERN-EP-2021-042.- Geneva : CERN, 2022-03-15 - 25 p. - Published in : Nature Phys. Fulltext: LHCb-PAPER-2021-004 - PDF; Addendum - PDF; Publication - PDF; 2103.11769 - PDF; Related data file(s): ZIP; Supplementary information: ZIP; External links: CERN News article; LHCb News article; Interactions.org article; BBC News article; Scientific American article

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