2024-09-10
15:33 |
Shedding light on Dark Sectors with high-energy muons at the NA64 experiment at the CERN SPS
/ Andreev, Yu.M. ; Banerjee, D. ; Oberhauser, B. Banto ; Bernhard, J. ; Bisio, P. ; Charitonidis, N. ; Crivelli, P. ; Depero, E. ; Dermenev, A.V. ; Donskov, S.V. 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, $X\rightarrow\text{invisible}$. [...]
CERN-EP-2024-236; arXiv:2409.10128.-
Geneva : CERN, 2024 - 24 p.
Draft (restricted): PDF; Fulltext: CERN-EP-2024-236 - PDF; 2409.10128 - PDF;
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2024-05-30
08:56 |
50 GeV π− in, nothing out: a sensitive probe of invisible η and η′ decays with NA64h
/ Andreev, Yu.M. (Unlisted) ; Antonov, A. (INFN, Genoa) ; Ayala Torres, M.A. (Andres Bello Natl. U. ; SAPHIR Millennium Inst.) ; Banerjee, D. (CERN) ; Oberhauser, B. Banto (Zurich, ETH) ; Bernhard, J. (CERN) ; Bisio, P. (INFN, Genoa ; U. Genoa) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Cooke, D. (University Coll. London) et al.
/NA64
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. [...]
arXiv:2406.01990; CERN-EP-2024-153.-
Geneva : CERN, 2024 - 5 p.
Fulltext: 2406.01990 - PDF; CERN-EP-DRAFT-NA64-2024-002_v2 - PDF; CERN-EP-DRAFT-NA64-2024-002 - PDF;
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2024-04-08
21:04 |
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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2024-03-21
08:14 |
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2023-12-18
23:31 |
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2023-09-06
06:06 |
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2023-08-28
18:35 |
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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2023-07-06
08:11 |
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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2023-05-27
00:27 |
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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2023-05-25
04:05 |
Constraining light thermal inelastic dark matter with NA64
/ Mongillo, Martina (Zurich, ETH) ; Abdullahi, Asli (Fermilab ; Durham U., IPPP) ; Oberhauser, Benjamin Banto (Zurich, ETH) ; Crivelli, Paolo (Zurich, ETH) ; Hostert, Matheus (Cambridge U., DAMTP ; Perimeter Inst. Theor. Phys. ; Minnesota U. ; Minnesota U., Theor. Phys. Inst.) ; Massaro, Daniele (Bologna U. ; INFN, Bologna ; Louvain U., CP3) ; Bueno, Laura Molina (Valencia U., IFIC) ; Pascoli, Silvia (Bologna U. ; INFN, Bologna ; CERN)
A vector portal between the Standard Model and the dark sector is a predictive and compelling framework for thermal dark matter. Through co-annihilations, models of inelastic dark matter (iDM) and inelastic Dirac dark matter (i2DM) can reproduce the observed relic density in the MeV to GeV mass range without violating cosmological limits. [...]
arXiv:2302.05414; IRMP-CP3-23-09; FERMILAB-PUB-23-066-T.-
2023-05-10 - 14 p.
- Published in : Eur. Phys. J. C 83 (2023) 391
Fulltext: FERMILAB-PUB-23-066-T - PDF; 2302.05414 - PDF; Fulltext from Publisher: PDF; External link: Fermilab Library Server
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