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First Results in the Search for Dark Sectors at NA64 with the CERN SPS High Energy Muon Beam / NA64 Collaboration
We report on a search for a new $Z'$ ($L_\mu-L_\tau$) vector boson performed at the NA64 experiment employing a high energy muon beam and a missing energy-momentum technique. Muons from the M2 beamline at the CERN Super Proton Synchrotron with a momentum of 160 GeV/c are directed to an active target. [...]
arXiv:2401.01708; CERN-EP-2023-306.- Geneva : CERN, 2024-05-21 - 5 p. - Published in : Phys. Rev. Lett. 132 (2024) 211803 Draft (restricted): PDF; Fulltext: CERN-EP-2023-306 - PDF; Publication - PDF; 2401.01708 - PDF;

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Search for Light Dark Matter with NA64 at CERN / NA64 Collaboration
Thermal dark matter models with particle $\chi$ masses below the electroweak scale can provide an explanation for the observed relic dark matter density. This would imply the existence of a new feeble interaction between the dark and ordinary matter. [...]
arXiv:2307.02404; CERN-EP-2023-130.- 2023-10-16 - 7 p. - Published in : Phys. Rev. Lett. 131 (2023) 161801 Fulltext: 2307.02404 - PDF; Publication - PDF;

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Probing light dark matter with positron beams at NA64 / NA64 Collaboration
We present the results of a missing-energy search for Light Dark Matter which has a new interaction with ordinary matter transmitted by a vector boson, called dark photon ($A^\prime$). For the first time, this search is performed with a positron beam by using the significantly enhanced production of $A^\prime$ in the resonant annihilation of positrons with atomic electrons of the target nuclei, followed by the invisible decay of $A^\prime$ into dark matter. [...]
arXiv:2308.15612; CERN-EP-2023-192.- Geneva : CERN, 2024-02-01 - 6 p. - Published in : Phys. Rev. D 109 (2024) L031103 Draft (restricted): PDF; Fulltext: CERN-EP-2023-192 - PDF; 2308.15612 - PDF; Publication - PDF;

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Measurement of the intrinsic hadronic contamination in the NA64<math altimg="si2.svg" display="inline" id="d1e670"><mrow><mo>−</mo><mi>e</mi></mrow></math> high-purity <math altimg="si3.svg" display="inline" id="d1e678"><mrow><msup><mrow><mi>e</mi></mrow><mrow><mo>+</mo></mrow></msup><mo>/</mo><msup><mrow><mi>e</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> beam at CERN / Andreev, Yu.M. (Unlisted) ; Banerjee, D. (CERN) ; Oberhauser, B. Banto (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (INFN, Genoa ; Genoa U.) ; Bondí, M. (INFN, Catania) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Unlisted) ; Cooke, D. (University Coll. London) et al.
In this study, we present the measurement of the intrinsic hadronic contamination at the CERN SPS H4 beamline configured to transport electrons and positrons at 100 GeV/c momentum. The analysis was performed using data collected by the NA64-$e$ experiment in 2022. [...]
arXiv:2305.19411; CERN-EP-2023-108.- Geneva : CERN, 2023-10-12 - 8 p. - Published in : Nucl. Instrum. Methods Phys. Res., A 1057 (2023) 168776 Draft (restricted): PDF; Fulltext: 2305.19411 - PDF; Publication - PDF; CERN-EP-2023-108 - PDF;

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(66)

First constraints on the L$_{μ}$− L$_{τ}$ explanation of the muon g-2 anomaly from NA64-e at CERN / NA64 Collaboration
The inclusion of an additional $U(1)$ gauge $L_\mu-L_\tau$ symmetry would release the tension between the measured and the predicted value of the anomalous muon magnetic moment: this paradigm assumes the existence of a new, light $Z^\prime$ vector boson, with dominant coupling to $\mu$ and $\tau$ leptons and interacting with electrons via a loop mechanism. The $L_\mu-L_\tau$ model can also explain the Dark Matter relic abundance, by assuming that the $Z^\prime$ boson acts as a ``portal'' to a new Dark Sector of particles in Nature, not charged under known interactions. [...]
arXiv:2404.06982; CERN-EP-2024-103.- Geneva : CERN, 2024-07-23 - 15 p. - Published in : JHEP 2407 (2024) 212 Draft (restricted): PDF; Fulltext: CERN-EP-2024-103 - PDF; document - PDF; NA64-PAPER-24-02 - PDF; 2404.06982 - PDF;

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Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS / Andreev, Yu.M. (Unlisted) ; Banerjee, D. (CERN) ; Banto Oberhauser, B. (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (Kobe U. ; INFN, Genoa) ; Charitonidis, N. (CERN) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Unlisted) ; Donskov, S.V. (Unlisted) et al. /NA64
A search for Dark Sectors is performed using the unique M2 beam line at the CERN Super Proton Synchrotron. New particles ($X$) could be produced in the bremsstrahlung-like reaction of high energy 160 GeV muons impinging on an active target, $\mu N\rightarrow\mu NX$, followed by their decays, $X\rightarrow\text{invisible}$. [...]
arXiv:2409.10128; CERN-EP-2024-236.- Geneva : CERN, 2024 - 24 p. Draft (restricted): PDF; Fulltext: CERN-EP-2024-236 - PDF; 2409.10128 - PDF;

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Dark-Sector Search via Pion-Produced η and η′ Mesons Decaying Invisibly in the NA64h Detector / NA64 Collaboration
We present the first results from a proof-of-concept search for dark sectors via invisible decays of pseudoscalar η and η′ mesons in the NA64h experiment at the CERN SPS. Our novel technique uses the charge-exchange reaction of 50 GeV π- on nuclei of an active target as the source of neutral mesons. [...]
2024 - 6 p. - Published in : Phys. Rev. Lett. 133 (2024) 121803 Fulltext: PDF;

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SND@LHC: The Scattering and Neutrino Detector at the LHC / SND@LHC Collaboration
SND@LHC is a compact and stand-alone experiment designed to perform measurements with neutrinos produced at the LHC in the pseudo-rapidity region of ${7.2 < \eta < 8.4}$. The experiment is located 480 m downstream of the ATLAS interaction point, in the TI18 tunnel. [...]
arXiv:2210.02784.- 2024-05-23 - 57 p. - Published in : JINST 19 (2024) P05067 Fulltext: 2210.02784 - PDF; document - PDF;
In : The Large Hadron Collider and The Experiments for Run 3

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Model-independent measurement of charm mixing parameters in $\bar{B} \rightarrow D^0 ( \rightarrow K_S^0 \pi^+ \pi^-) \mu^- \bar{\nu}_\mu X$ decays / LHCb Collaboration
A measurement of charm mixing and $CP$-violating parameters is reported, using $\bar{B} \rightarrow D^0 ( \rightarrow K_S^0 \pi^+ \pi^-) \mu^-\bar{\nu}_\mu X$ decays reconstructed in proton-proton collisions collected by the LHCb experiment during the years 2016 to 2018, corresponding to an integrated luminosity of 5.4 fb$^{-1}$. The measured mixing and $CP$-violating parameters are $x_{\rm CP} = [ \,\,\,\,\,4.29 \pm 1.48 \mbox{(stat)} \pm 0.26 \mbox{(syst)} ] \times 10^{-3}\,, $ $y_{\rm CP} = [ \,\,12.61 \pm 3.12 \mbox{(stat)} \pm 0.83 \mbox{(syst)} ] \times 10^{-3} \,, $ $\Delta x \,\,= [ -0.77 \pm 0.93 \mbox{(stat)} \pm 0.28 \mbox{(syst)} ] \times 10^{-3} \,,$ $\Delta y \, = [ \,\,\,\,\,3.01 \pm 1.92 \mbox{(stat)} \pm 0.26 \mbox{(syst)} ] \times 10^{-3} \,.$ The results are complementary to and consistent with previous measurements. [...]
arXiv:2208.06512; LHCb-PAPER-2022-020; CERN-EP-2022-160.- 2023-09-01 - 17 p. - Published in : Phys. Rev. D 108 (2023) 052005 Fulltext: LHCb-PAPER-2022-020_EBFinal - PDF; 2208.06512 - PDF; Publication - PDF; Related data file(s): ZIP;

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Observation of sizeable $\omega$ contribution to $\chi_{c1}(3872) \to \pi^+\pi^- J/\psi$ decays / LHCb Collaboration
Resonant structures in the dipion mass spectrum from $\chi_{c1}(3872)\to\pi^+\pi^- J/\psi$ decays, produced via $B^+\to K^+\chi_{c1}(3872)$ decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb$^{-1}$. A sizeable contribution from the isospin conserving $\chi_{c1}(3872)\to\omega J/\psi$ decay is established for the first time, $(21.4\pm2.3\pm2.0)\%$, with a significance of more than $7.1\sigma$. [...]
arXiv:2204.12597; LHCb-PAPER-2021-045; CERN-EP-2022-049.- Geneva : CERN, 2023-07-01 - 12 p. - Published in : Phys. Rev. D 108 (2023) L011103 Fulltext: 2204.12597 - PDF; Publication - PDF; LHCb-PAPER-2021-045 - PDF; Related data file(s): ZIP;

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