Improved exclusion limit for light dark matter from 
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 annihilation in NA64

Andreev, Yu.; Banerjee, D.; Bernhard, J.; Bondí, M.; Burtsev, V.E.; Celentano, A.; Charitonidis, N.; Chumakov, A.G.; Cooke, D.; Crivelli, P.; Depero, E.; Dermenev, A.; Donskov, S.V.; Dusaev, R. R.; Enik, T.; Feshchenko, A.; Фролов, В.; Gardikiotis, A.; Gerassimov, S.; Gninenko, S.; Hoesgen, M.; Jeckel, M.; Качанов, В.; Karneyeu, A.; Kekelidze, G. D.; Ketzer, B.; Kirpichnikov, D.; Kirsanov, M.; Kolosov, V.N.; Konorov, I.; Kovalenko, Sergey; Kramarenko, V. A.; Kravchuk, L.; Krasnikov, N.; Kuleshov, S.; Lyubovitskij, Valery E.; Lysan, V.; Marsicano, L.; Matveev, V.; Mikhailov, Yu.V.; Molina, L. T.; Peshekhonov, D.V.; Polyakov, V.A.; Radics, B.; Rojas, R. A.; Rubbia, A.; Samoylenko, V.D.; Sieber, H.; Shchukin, Dmitry G.; Tikhomirov, V. O.; Tlisova, I.; Toropin, A.; Trifonov, A. Yu.; Ulloa, P.; Vasilishin, B. I.; Vasquez, G. A.; Volkov, P.; Volkov, V.

doi:10.1103/physrevd.104.l091701

Cited by 33 publications

(19 citation statements)

References 43 publications

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“…Due to the detector geometry, T (E) is almost the same for the plastic scintillator and the lead, while a Z 2 dependence is included in the cross section: since N scales as the material density over the atomic mass, in the following we will consider only the contribution from the lead (the same approximation was made in the analysis presented in Ref. [41,57]). A similar relation holds for the Z case:…”

Section: Methodsmentioning

confidence: 99%

“…NA64-e already completed data-taking campaigns in 2016, 2017, 2018 with a total accumulated charge of about N EOT = 2.84 • 10 11 electrons-on-target (EOT). The selection criteria adopted in the analysis were identified by optimizing the experiment sensitivity, adopting a blind-analysis approach [41,55,57]. These include the requirement to have a well reconstructed track in the upstream spectrometer, with momentum in the range (100 ± 3) GeV, an in-time cluster in the SRD detector, and a shower signal in the ECAL with the longitudinal and transverse shape of a missing-energy event.…”

Section: The Na64-e Experimentsmentioning

confidence: 99%

“…After applying all selection cuts, no events were observed in the signal region, defined by the two requirements E ECAL < 50 GeV and E HCAL < 1 GeV; this observation is compatible with the estimate of (0.53 ± 0.17) background events, mostly due to the interaction of electrons with upstream beamline elements, producing a soft electron hitting the ECAL and one or more hadrons at large angle missing the NA64-e detector. This result was used to set an exclusion limit for the production of an invisibly decaying dark photon (A ), taking into account both the radiative and resonant production [57].…”

Section: The Na64-e Experimentsmentioning

confidence: 99%

“…We evaluated η down for the different reaction channels and parameter models through a GEANT4 simulation of the full NA64-e detector setup using the DMG4 package for events generation [59] and adopting an ad-hoc crosssection biasing mechanism to enhance signal production without distorting the corresponding kinematics, similarly to what was performed in Ref. [57]. The DMG4 package does not offer the possibility to consider off-shell Z production, therefore we used the on-shell approximation Π(q 2 ) → Π(m 2 Z ) in the calculation of η down ; this does not significantly affect the kinematics of the produced Z and of the invisible decay particles.…”

Section: B Signal Acceptance and Detection Efficiencymentioning

confidence: 99%

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Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

Andreev,

Banerjee,

Oberhauser

et al. 2022

Preprint

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The extension of Standard Model made by inclusion of additional U (1) gauge Lµ − Lτ 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 vector boson, predominantly coupled to second and third generation leptons, whose interaction with electrons is due to a loop mechanism involving muons and taus. In this work, we present a rigorous evaluation of the upper limits in the Z parameter space, obtained from the analysis of the data collected by the NA64-e experiment at CERN SPS, that performed a search for light dark matter with 2.84 × 10 11 electrons impinging with 100 GeV on an active thick target. The resulting limits, despite being included in a region already investigated by neutrino experiments, touch the muon g − 2 preferred band for values of the Z mass of order of 1 MeV. The sensitivity projections for the future high-statistics NA64-e runs demonstrate the power of the electrons/positron beam approach in this theoretical scenario.

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Section: Methodsmentioning

confidence: 99%

Section: The Na64-e Experimentsmentioning

confidence: 99%

Section: The Na64-e Experimentsmentioning

confidence: 99%

Section: B Signal Acceptance and Detection Efficiencymentioning

confidence: 99%

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Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

Andreev,

Banerjee,

Oberhauser

et al. 2022

Preprint

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“…Present accelerator technology provides high intensity particle beams of moderate energy that are well suited for the discovery of LDM [6,7]. In particular, electron beam dump experiments have been shown to have high sensitivity to light dark matter [18][19][20]. In these experiments, light dark matter particles (χ χ pairs) are conjectured to be produced when the electron beam interacts with nucleons and electrons in the beam dump via A radiative process (A -strahlung) or annihilation (resonant and non-resonant) of positrons produced by the electromagnetic shower generated therein [21][22][23].…”

Section: Introduction and Theoretical Frameworkmentioning

confidence: 99%

Dark matter search with the BDX-MINI experiment

Battaglieri¹,

Bondì²,

Celentano³

et al. 2022

Preprint

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BDX-MINI is a beam dump experiment optimized to search for Light Dark Matter produced in the interaction of the intense CEBAF 2.176 GeV electron beam with the Hall A beam dump at Jefferson Lab. The BDX-MINI detector consists of a PbWO4 electromagnetic calorimeter surrounded by a hermetic veto system for background rejection. The experiment accumulated 2.56 × 10 21 EOT in six months of running. Simulations of fermionic and scalar Dark Matter interactions with electrons of the active volume of the BDX-MINI detector were used to estimate the expected signal. Data collected during the beam-off time allowed us to characterize the background dominated by cosmic rays. A blind data analysis based on a maximum-likelihood approach was used to optimize the experiment sensitivity. An upper limit on the production of light dark matter was set using the combined event samples collected during beam-on and beam-off configurations. In some kinematics, this pilot experiment is sensitive to the parameter space covered by some of the most sensitive experiments to date, which demonstrates the discovery potential of the next generation beam dump experiment planned at intense electron beam facilities.

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Sub-GeV dark matter search at ILC beam dumps

Asai,

Iwamoto,

Perelstein

et al. 2024

J. High Energ. Phys.

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Light dark matter particles may be produced in electron and positron beam dumps of the International Linear Collider (ILC). We propose an experimental setup to search for such events, the Beam-Dump eXperiment at the ILC (ILC-BDX). The setup consists of a muon shield placed behind the beam dump, followed by a multi-layer tracker and an electromagnetic calorimeter. The calorimeter can detect electron recoils due to elastic scattering of dark matter particles produced in the dump, while the tracker is sensitive to decays of excited dark-sector states into the dark matter particle. We study the production, decay and scattering of sub-GeV dark matter particles in this setup in several models with a dark photon mediator. Taking into account beam-related backgrounds due to neutrinos produced in the beam dump as well as the cosmic-ray background, we evaluate the sensitivity reach of the ILC-BDX experiment. We find that the ILC-BDX will be able to probe interesting regions of the model parameter space and, in many cases, reach well below the relic target.

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Improved exclusion limit for light dark matter from e+e− annihilation in NA64

Cited by 33 publications

References 43 publications

Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

Search for a light muon-philic $Z^\prime$ with the NA64-$e$ experiment at CERN

Dark matter search with the BDX-MINI experiment

Sub-GeV dark matter search at ILC beam dumps

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