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CERN Document Server 2,045 записей найдено  1 - 10следующийконец  перейти к записи: Поиск длился 0.72 секунд. 
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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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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 light $Z′$ in the $L_μ-L_τ$ scenario with the NA64-$e$ experiment at CERN / NA64 Collaboration
The extension of Standard Model made by inclusion of additional $U(1)$ gauge $L_\mu-L_\tau$ symmetry can explain the difference between the measured and the predicted value of the muon magnetic moment and solve the tension in $B$ meson decays. This model predicts the existence of a new, light $Z^\prime$ vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. [...]
arXiv:2206.03101.- 2022-08-01 - 11 p. - Published in : Phys. Rev. D 106 (2022) 032015 Fulltext: PhysRevD.106.032015 - PDF; 2206.03101 - PDF;
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Improved exclusion limit for light dark matter from $e^+e^-$ annihilation in NA64 / Andreev, Yu.M. (Moscow, INR) ; Banerjee, D. (CERN) ; Bernhard, J. (CERN) ; Bondi, M. (INFN, Genoa) ; Burtsev, V.E. (Dubna, JINR) ; Celentano, A. (INFN, Genoa) ; Charitonidis, N. (CERN) ; Chumakov, A.G. (Tomsk Polytechnic U. ; Tomsk Pedagogical Inst.) ; Cooke, D. (U. Coll. London) ; Crivelli, P. (Zurich, ETH) et al.
The current most stringent constraints for the existence of sub-GeV dark matter coupling to Standard Model via a massive vector boson $A^\prime$ were set by the NA64 experiment for the mass region $m_{A^\prime}\lesssim 250$ MeV, by analyzing data from the interaction of $2.84\cdot10^{11}$ 100-GeV electrons with an active thick target and searching for missing-energy events. In this work, by including $A^\prime$ production via secondary positron annihilation with atomic electrons, we extend these limits in the $200$-$300$ MeV region by almost an order of magnitude, touching for the first time the dark matter relic density constrained parameter combinations. [...]
arXiv:2108.04195; CERN-EP-2021-164.- 2021-11-01 - 7 p. - Published in : Phys. Rev. D 104 (2021) L091701 Fulltext: PDF;
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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 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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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 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 pseudoscalar bosons decaying into e+e- pairs in the NA64 experiment at the CERN SPS / NA64 Collaboration
We report the results of a search for a light pseudoscalar particle $a$ that couples to electrons and decays to $e^+e^-$ performed using the high-energy CERN SPS H4 electron beam. If such pseudoscalar with a mass $\simeq 17$ MeV exists, it could explain the ATOMKI anomaly. [...]
arXiv:2104.13342.- 2021-12-01 - 5 p. - Published in : Phys. Rev. D 104 (2021) L111102 Fulltext: 2104.13342 - PDF; PhysRevD.104.L111102 (1) - PDF; PhysRevD.104.L111102 - PDF;
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