2024-12-06 06:16 |
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2024-12-04 07:42 |
Dark sector searches at NA64-$e$
/ Celentano, Andrea (INFN, Genoa)
/NA64 Collaboration
The Light Dark Matter (LDM) hypothesis identifies dark matter particles with new sub-GeV "Hidden Sector'' states, neutral under Standard Model interactions and interfacing with our world through a new force. In the simplest model, the new interaction is mediated by a massive vector particle, also called "dark photon'' ($A^\prime$), kinetically mixed with the ordinary photon. [...]
2024 - 6 p.
- Published in : PoS WIFAI2023 (2024) 014
Fulltext: PDF;
In : Workshop Italiano sulla Fisica ad Alta Intensita (WIFAI 2023), Rome, Italy, 8 - 10 Nov 2023, pp.014
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2024-11-14 08:02 |
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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. (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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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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