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CERN Document Server 2,041 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 0.80 секунд. 
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Probing the explanation of the muon (g-2) anomaly and thermal light dark matter with the semi-visible dark photon channel / Cazzaniga, C. (Zurich, ETH) ; Odagiu, P. (Zurich, ETH ; EPFL, Lausanne, FSL) ; Depero, E. (Zurich, ETH) ; Bueno, L. Molina (Zurich, ETH ; Valencia U., IFIC) ; Andreev, Yu. M. (Moscow, INR) ; Banerjee, D. (CERN ; Illinois U., Urbana (main)) ; Bernhard, J. (CERN) ; Burtsev, V.E. (Dubna, JINR) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Tomsk Pedagogical Inst. ; Tomsk Polytechnic U.) et al.
We report the results of a search for a new vector boson ($\gp$) decaying into two dark matter particles $\chi_1 \chi_2$ of different mass. The heavier $\chi_2$ particle subsequently decays to $\chi_1$ and $\gp \to \pair$. [...]
arXiv:2107.02021.- Geneva : CERN, 2021-10-30 - 6 p. - Published in : Eur. Phys. J. C 81 (2021) 959 Draft (restricted): PDF; Fulltext: 2107.02021 - PDF; document - PDF; CERN-EP-2021-129 - PDF;
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Hunting down the X17 boson at the CERN SPS / NA64 Collaboration
Recently, the ATOMKI experiment has reported new evidence for the excess of $e^+ e^-$ events with a mass $\sim$17 MeV in the nuclear transitions of $^4$He, that they previously observed in measurements with $^8$Be. These observations could be explained by the existence of a new vector $X17$ boson. [...]
arXiv:2009.02756.- 2020-12-15 - 17 p. - Published in : Eur. Phys. J. C 80 (2020) 1159 Article from SCOAP3: PDF; Fulltext: PDF;
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The Search for Light Dark Matter at NA64 Experiment / Krasnikov, N V (Moscow, INR ; Dubna, JINR)
This minireview aim is to outline the main experimental results related to the search for LDM (light dark matter) at NA64 experiment at CERN. We discuss current results and the NA64 perspectives. [...]
2020 - 6 p. - Published in : Phys. Part. Nucl. 51 (2020) 697-702
In : International Bogolyubov Conference Problems of Theoretical and Mathematical Physics (BOG), Moscow, Russian Federation, 9 - 13 Sep 2019, pp.697-702
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Search for Axionlike and Scalar Particles with the NA64 Experiment / NA64 Collaboration
We carried out a model-independent search for light scalar (s) and pseudoscalar axionlike (a) particles that couple to two photons by using the high-energy CERN SPS H4 electron beam. The new particles, if they exist, could be produced through the Primakoff effect in interactions of hard bremsstrahlung photons generated by 100 GeV electrons in the NA64 active dump with virtual photons provided by the nuclei of the dump. [...]
arXiv:2005.02710; CERN-EP-2020-068.- 2020-08-17 - 7 p. - Published in : Phys. Rev. Lett. 125 (2020) 8 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: 2005.02710 - PDF; CERN-EP-2020-068 - PDF;
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Search for a New $B$ - $L$ $Z'$ Gauge Boson with the NA64 Experiment at CERN / NA64 Collaboration
A search for a new $Z'$ gauge boson associated with (un)broken B-L symmetry in the keV-GeV mass range is carried out for the first time using the missing-energy technique in the NA64 experiment at the CERN SPS. From the analysis of the data with 3.22e11 electrons on target collected during 2016-2021 runs no signal events were found. [...]
arXiv:2207.09979; CERN-EP-2022-156.- 2022-10-12 - 6 p. - Published in : Phys. Rev. Lett. 129 (2022) 161801 Fulltext: PDF;
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Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into $e^+e^-$ pairs / NA64 Collaboration
The improved results on a direct search for a new $X$(16.7 MeV) boson which could explain the anomalous excess of $e^+e^-$ pairs observed in the excited $^8Be^*$ nucleus decays ("Berillium anomaly") are reported. Due to its coupling to electrons, the $X$ boson could be produced in the bremsstrahlung reaction $e^-Z\rightarrow e^-ZX$ by a high-energy beam of electrons incident on active target in the NA64 experiment at the CERN SPS and observed through its subsequent decay into $e^+e^-$ pair. [...]
arXiv:1912.11389; CERN-EP-2019-284.- 2020-04-17 - 7 p. - Published in : Phys. Rev. D 101 (2020) 071101 Article from SCOAP3: PDF; Fulltext: PDF;
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Dark matter search in missing energy events with NA64 / NA64 Collaboration
A search for sub-GeV dark matter production mediated by a new vector boson $A'$, called dark photon, is performed by the NA64 experiment in missing energy events from 100 GeV electron interactions in an active beam dump at the CERN SPS. From the analysis of the data collected in the years 2016, 2017, and 2018 with $2.84\times10^{11}$ electrons on target no evidence of such a process has been found. [...]
arXiv:1906.00176; CERN-EP-2019-116.- 2019-09-19 - 7 p. - Published in : Phys. Rev. Lett. 123 (2019) 121801 Article from SCOAP3: PDF; Fulltext: PDF; Fulltext from Publisher: PDF;
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Search for vector mediator of Dark Matter production in invisible decay mode / NA64 Collaboration
A search is performed for a new sub-GeV vector boson ($A'$) mediated production of Dark Matter ($\chi$) in the fixed-target experiment, NA64, at the CERN SPS. The $A'$, called dark photon, could be generated in the reaction $ e^- Z \to e^- Z A'$ of 100 GeV electrons dumped against an active target which is followed by the prompt invisible decay $A' \to \chi \overline{\chi}$. [...]
arXiv:1710.00971.- 2018-04-04 - 21 p. - Published in : Phys. Rev. D 97 (2018) 072002 Article from SCOAP3: PDF; Fulltext: PDF;
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Search for a new X(16.7) boson and dark photons in the NA64 experiment at CERN / Banerjee, D. (Illinois U., Urbana (main)) ; Burtsev, V.E. (Tomsk Pedagogical Inst.) ; Chumakov, A.G. (Tomsk Pedagogical Inst.) ; Cooke, D. (Zurich, ETH) ; Crivelli, P. (Zurich, ETH) ; Depero, E. (Zurich, ETH) ; Dermenev, A.V. (Moscow, INR) ; Donskov, S.V. (Serpukhov, IHEP) ; Dusaev, R.R. (Tomsk Pedagogical Inst.) ; Enik, T. (Dubna, JINR) et al.
We report the first results on a direct search for a new 16.7 MeV boson (X) which could explain the anomalous excess of e+e- pairs observed in the excited 8Be* nucleus decays. Due to its coupling to electrons, the X could be produced in the bremsstrahlung reaction e-Z -> e-ZX by a 100 GeV e- beam incident on an active target in the NA64 experiment at the CERN SPS and observed through the subsequent decay into a e+e- pair. [...]
arXiv:1803.07748; CERN-EP-2018-043.- Geneva : CERN, 2018-06-09 - 6 p. - Published in : Phys. Rev. Lett. 120 (2018) 231802 Article from SCOAP3: PDF; Draft (restricted): PDF; Fulltext: CERN-EP-2018-043 - PDF; 1803.07748 - PDF; Fulltext from Publisher: PDF;
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Search for invisible decays of sub-GeV dark photons in missing-energy events at the CERN SPS / NA64 Collaboration
We report on a direct search for sub-GeV dark photons (A') which might be produced in the reaction e^- Z \to e^- Z A' via kinetic mixing with photons by 100 GeV electrons incident on an active target in the NA64 experiment at the CERN SPS. The A's would decay invisibly into dark matter particles resulting in events with large missing energy. [...]
arXiv:1610.02988.- 2017-01-05 - 6 p. - Published in : Phys. Rev. Lett. 118 (2017) 011802 Fulltext: 10.1103_PhysRevLett.118.011802 - PDF; arXiv:1610.02988 - PDF; External link: Preprint
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