Dark Matter Search in Missing Energy Events with NA64

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

doi:10.1103/physrevlett.123.121801

Cited by 243 publications

(309 citation statements)

References 65 publications

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“…3. The grey shaded areas are current bounds on the visibly decaying dark photon from various fixed target and collider experiments 4 [36][37][38][39][40][41][42][43][44][45][46][47][48], and from Supernova 1987A [49][50][51]. The most stringent direct-detection bounds on weak scale DM come from the XENON1T experiment and for m χ ∼ 1 TeV, the limit lies at σ χn ∼ 10 −45 cm 2 [52].…”

Section: Constraints and Phenomenologymentioning

confidence: 99%

Getting a THUMP from a WIMP

Davoudiasl

Mohlabeng

2020

J. High Energ. Phys.

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Producing an acceptable thermal relic abundance of dark matter with masses 10 2 TeV is a challenge. We propose a novel mechanism where GeV-scale states establish a tiny thermal relic abundance for dark matter, which is later promoted to ultra massive status by a very light scalar. We refer to this dark matter as a THermal Ultra Massive Particle (THUMP). Direct detection of THUMPs can be naturally expected due to large scattering cross sections mediated by low mass states that couple THUMPs to the Standard Model. Our model generically leads to signals for the associated GeV-scale states at accelerator experiments.

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Section: Constraints and Phenomenologymentioning

confidence: 99%

Getting a THUMP from a WIMP

Davoudiasl

Mohlabeng

2020

J. High Energ. Phys.

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“…Taking this broader point of view, in [41] we studied in-depth the possibility that χ particles-not necessarily the main component of DM-carry electromagnetic (EM) form factor interactions. In particular, we studied χ pair-production in electron beams on fixed targets at NA64 [42], LDMX [43], BDX [44], and mQ [9], in e + e − colliders BaBar [45] and Belle-II [46] and in proton-proton collisions at LHC [47]. In addition, flavor constraints from rare meson decays such as K ± → π ± + inv.…”

Section: Introductionmentioning

confidence: 99%

Dark sector-photon interactions in proton-beam experiments

2020

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We consider electromagnetically neutral dark states that couple to the photon through higher dimensional effective operators, such as electric and magnetic dipole moment, anapole moment and charge radius operators. We investigate the possibility of probing the existence of such dark states, taking a Dirac fermion χ as an example, at several representative proton-beam experiments. As no positive signal has been reported, we obtain upper limits (or projected sensitivities) on the corresponding electromagnetic form factors for dark states lighter than several GeV. We demonstrate that while the current limits from proton-beam experiments are at most comparable with those from high-energy electron colliders, future experiments, such as DUNE and SHiP, will be able to improve the sensitivities to electric and magnetic dipole moment interactions, owing to their high intensity.

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“…As in the previous analyses [61,62], in order to check efficiencies and the reliability of the MC simulations, we selected a clean sample of 10 5 µ + µ − events with E W CAL < 0.6 × E beam from the QED muon pair production in the dump (dimuons). This rare process is dominated by the reaction e − Z → e − Zγ; γ → µ + µ − of a photon conversion into muon pair on a dump nucleus.…”

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confidence: 99%

Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into e+e− pairs

Banerjee¹,

Bernhard²,

Burtsev³

et al. 2020

Phys. Rev. D

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100

103

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The improved results on a direct search for a new X(16.7 MeV) boson that could explain the anomalous excess of e + e − pairs observed in the decays of the excited 8 Be * nucleus ("Berillium anomaly") are reported. The X boson could be produced in the bremsstrahlung reaction e − Z → e − ZX by a high energy beam of electrons incident on the active target in the NA64 experiment at the CERN SPS and observed through its subsequent decay into e + e − pair. No evidence for such decays was found from the combined analysis of the data samples with total statistics corresponding to 8.4 × 10 10 electrons on target collected in 2017 and 2018. This allows to set the new limits on the X − e − coupling in the range 1.2 × 10 −4 e 6.8 × 10 −4 , excluding part of the parameter space favored by the Berillium anomaly. The non-observation of the decay A → e + e − allows also to set the new bounds on the mixing strength of photons with dark photons (A ) with a mass 24 MeV.Recently, the search for new light bosons weakly coupled to SM particles was additionally inspired by the observation in the ATOMKI experiment by Krasznahorkay et al. [1,2] of a ∼7σ excess of events in the invariant mass distribution of e + e − pairs produced in the nuclear transitions of the excited 8 Be * to its ground state via internal pair creation. It was shown that this anomaly can be interpreted as the emission of a protophobic gauge boson X with a mass of 16.7 MeV decaying into e + e − pair [3,4]. This explanation of the anomaly was found to be consistent with the existing constraints assuming that the X has non-universal coupling to quarks, coupling to electrons in the range 2 × 10 −4 e 1.4 × 10 −3 and lifetime 10 −14 τ X 10 −12 s. It is interesting that a new boson with such relatively large couplings to charged leptons could also resolve the so-called (g µ − 2 ) anomaly, a discrepancy between measured and predicted values of the muon anomalous magnetic moment. This has motivated worldwide efforts towards the experimental searches, see, e.g., Refs. [5,6], and studies of the phenomenological aspects of light vector bosons weakly coupled to quarks and leptons, see, e.g., and also earlier works of Refs. [13][14][15][16]. The latest experimental results from the ATOMKI group show a similar excess of events at approximately the same invariant mass in the nuclear transitions of another nucleus, 4 He [17]. This further increases the importance of independent searches for a new particle X.Another strong motivation to search for new light bosons decaying into e + e − pair comes from the dark matter puzzle. An interesting possibility is that in addition to gravity a new force between the dark sector and visible matter, carried by a new vector boson A , called dark photon, might exist [18,19]. Such A could have a mass

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Dark Matter Search in Missing Energy Events with NA64

Cited by 243 publications

References 65 publications

Getting a THUMP from a WIMP

Getting a THUMP from a WIMP

Dark sector-photon interactions in proton-beam experiments

Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into e+e− pairs

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