Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN

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.; Peshekhonov, D.V.; Polyakov, V.A.; Radics, B.; Rojas, R. A.; Rubbia, A.; Samoylenko, V.D.; Tikhomirov, V. O.; Tlisov, D.; Toropin, A.; Trifonov, A. Yu.; Vasilishin, B. I.; Vasquez, G. A.; Volkov, P.; Volkov, V.; Ulloa, P.

doi:10.1103/physrevlett.120.231802

Cited by 120 publications

(92 citation statements)

References 89 publications

(102 reference statements)

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“…Since neutrino oscillations are not affected by flavor universal NSI, here we only consider nonuniversal flavor-conserving NSI. Also, because scenarios involving L e are heavily constrained in the low-mass region by electron beam-dump experiments [15][16][17][18][19][20], we set Q e = 0 and only consider the less constrained eletrophobic NSI. For the sake of illustration, we take the following three cases for our benchmark studies [21]:…”

Section: Introductionmentioning

confidence: 99%

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Han

Liao

Liu

et al. 2019

J. High Energ. Phys.

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We study how nonstandard neutrino interactions (NSI) may be probed by a combination of coherent elastic neutrino-nucleus scattering, neutrino oscillation and collider data, from COHERENT, DUNE, T2HK and the high-luminosity (HL) LHC. We focus on NSI induced by a new flavored gauge boson Z in a generic anomaly-free ultraviolet-complete model. For Z masses above 10 GeV, the HL-LHC has the best sensitivity regardless of the flavor structure of the model. For masses between 0.01 GeV−10 GeV, current LHCb data and future COHERENT data have the best sensitivity unless the Z couplings to the first and second generation leptons are suppressed, in which case DUNE and T2HK have the best sensitivity. For Z masses between about 5 MeV−20 MeV, DUNE and T2HK have the best sensitivity. We also show how joint analyses of COHERENT and LHC data may constrain such models.

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Section: Introductionmentioning

confidence: 99%

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Han

Liao

Liu

et al. 2019

J. High Energ. Phys.

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“…The viable dark photon parameter space for the neutron dark matter scenario is shown in Fig. 1 (Left) with current constraints from experiments [60,61], supernovae [62,63], and BBN [64], as well as the projected sensitivities of upcoming experiments including 2 Both the dark neutron charge radius and the possible Higgs portal give subdominant contributions to this scattering. 3 This is still subject to uncertainties given disagreements with the NPLQCD collaboration [56,57] (with a possible resolution [58]), and the calculations are in the flavor SU (3) limit.…”

Section: A Dark Neutron Dark Mattermentioning

confidence: 99%

“…In this case, it becomes an ideal resonant self-interacting dark matter to Viable dark photon parameter space for asymmetric dark hadron dark matter. Existing constraints on dark photons from experiments [60,61], supernovae [62,63], and BBN [64] are dark gray. The constraints specific to our models, namely that m γ ≤ m π 0 /2 and that the dark photon decays before SM neutrinos decouple around T ∼ 3 MeV, are in light blue and red, respectively.…”

Section: B Dark Proton and Pion Dark Mattermentioning

confidence: 99%

Baryogenesis from a dark first-order phase transition

Hall

Konstandin

McGehee

et al. 2020

J. High Energ. Phys.

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We introduce a model for matters-genesis in which both the baryonic and dark matter asymmetries originate from a first-order phase transition in a dark sector with an SU (3) × SU (2) × U (1) gauge group and minimal matter content. In the simplest scenario, we predict that dark matter is a dark neutron with mass either mn = 1.33 GeV or mn = 1.58 GeV. Alternatively, dark matter may be comprised of equal numbers of dark protons and pions. This model, in either scenario, is highly discoverable through both dark matter direct detection and dark photon search experiments. The strong dark matter self interactions may ameliorate small-scale structure problems, while the strongly first-order phase transition may be confirmed at future gravitational wave observatories.

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“…Recently, collaboration of the NA64 beam dump experiment [70] reported the first results in attempting to search for the hypothetical 17 MeV gauge boson. This showed that, for the explanation of the gauge boson Z as the 8 Be anomaly, its coupling to the electron must satisfy the following constraint…”

Section: Be Anomaly and Other Constraintsmentioning

confidence: 99%

17 MeV Atomki anomaly from short-distance structure of spacetime

Nam

2020

Eur. Phys. J. C

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An anomaly observed recently in the 8 Be nuclear transition by the Atomki collaboration hints at a weakly-coupled, light new gauge boson with a mass about 17 MeV. In this paper, we propose that this new gauge boson comes from a short-distance structure of the spacetime, rather than from an extension of the Standard Model through adding an extra U(1) gauge symmetry. The dominant contribution to the relevant matrix element of the 8 Be nuclear transition is given by the axial couplings. For accounting for the 8 Be anomaly and satisfying the current experimental constraints, the coupling constant of the new gauge boson should be about O(10 −4 − 10 −5 ). Our theoretical model allows to understand the origin of the smallness of the coupling constant, which is still missing or being incompletely understood in the models at which the new gauge boson has the axial couplings. * Electronic address: hncao@yonsei.ac.kr arXiv:1907.09819v1 [hep-ph]

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Search for a Hypothetical 16.7 MeV Gauge Boson and Dark Photons in the NA64 Experiment at CERN

Cited by 120 publications

References 89 publications

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Nonstandard neutrino interactions at COHERENT, DUNE, T2HK and LHC

Baryogenesis from a dark first-order phase transition

17 MeV Atomki anomaly from short-distance structure of spacetime

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