Search for the dark photon in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si1.gif" overflow="scroll"><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:math>decays

Batley, J. R.; Kalmus, G.; Lazzeroni, C.; Munday, D.J.; Slater, M. W.; Wotton, S. A.; Arcidiacono, R.; Bocquet, G.; Cabibbo, N.; Ceccucci, A.; Cundy, D.; Falaleev, V.; Fidecaro, M.; Gatignon, L.; Gonidec, A.; Kubischta, W.; Norton, A.; Maier, A.; Patel, M.; Peters, A.; Balev, S.; Frabetti, P. L.; Gersabeck, E.; Goudzovski, E.; Hristov, P.; Kekelidze, V.; Kozhuharov, V.; Litov, L.; Madigozhin, D.; Molokanova, N.; Polenkevich, I.; Potrebenikov, Yu.; Stoynev, S.; Zinchenko, A.; Monnier, E.; Swallow, E. C.; Winston, R.; Rubin, P.; Walker, A.; Baldini, W.; Ramusino, A. Cotta; Dalpiaz, P.; Damiani, C.; Fiorini, M.; Gianoli, A.; Martini, M.; Petrucci, F.; Savrié, M.; Scarpa, M.; Wahl, H.; Bizzeti, A.; Lenti, M.; Veltri, M.; Calvetti, M.; Celeghini, E.; Iacopini, E.; Ruggiero, G.; Behler, M.; Eppard, K.; Kleinknecht, K.; Marouelli, P.; Masetti, L.; Moosbrugger, U.; Morales, C. Morales; Renk, B.; Wache, M.; Wanke, R.; Winhart, A.; Coward, D.; Dabrowski, A.; Martin, T. Fonseca; Shieh, M.; Szleper, M.; Velasco, M.; Wood, Max; Cenci, P.; Pepé, M.; Petrucci, M. C.; Anzivino, G.; Imbergamo, E.; Nappi, A.; Piccini, M.; Raggi, M.; Valdata‐Nappi, M.; Cerri, C.; Fantechi, R.; Collazuol, G.; DiLella, L.; Lamanna, G.; Mannelli, I.; Michetti, A.; Costantini, F.; Doble, N.; Fiorini, L.; Giudici, S.; Pierazzini, G.; Sozzi, M.; Venditti, S.; Bloch-Devaux, B.; Cheshkov, C.; Chèze, J.B.; Beer, M. De; Derré, J.; Marel, G.; Mazzucato, E.; Peyaud, B.; Vallage, B.; Holder, M.; Ziolkowski, M.; Biino, C.; Cartiglia, N.; Marchetto, F.; Bifani, S.; Clemencic, M.; Lopez, S. Goy; Dibon, H.; Jeitler, M.; Markytan, M.; Mikulec, I.; Neuhofer, G.; Widhalm, L.

doi:10.1016/j.physletb.2015.04.068

Cited by 313 publications

(277 citation statements)

References 29 publications

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“…A number of attempts were made to find such particles by using data from running facilities or reanalysing data of preceding experiments, but no evidence has been found yet [1,2]. In the near future, many ongoing experiments are expected to extend those regions in mass and coupling strength which are so far unexplored [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Observation of Anomalous Internal Pair Creation in $^8$Be

Gácsi

Csatlós

Ketel³

et al. 2015

Acta Phys. Pol. B Proc. Suppl.

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The electron-positron angular correlation was measured for the isoscalar magnetic dipole 18.15 MeV transition in 8 Be. Significant, peak-like deviation was observed from the internal pair creation at Θ ≈ 140• in the angular correlation. This observation might indicate that in an intermediate step a neutral isoscalar particle with a mass of 16.70±0.35 (stat.)±0.5(sys.) MeV/c 2 and J π = 1 + was created.

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Section: Introductionmentioning

confidence: 99%

Observation of Anomalous Internal Pair Creation in $^8$Be

Gácsi

Csatlós

Ketel³

et al. 2015

Acta Phys. Pol. B Proc. Suppl.

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“…[17]. 4 We translate the constraint into our framework by interpretting the process as π 0 → Z γ → e + e − γ.…”

Section: 8×10mentioning

confidence: 99%

“…[2] and constraints summarized in Ref. [16], two most severe bounds from the search of dark photon in the relevant mass range are obtained by NA48/2 [17] and E141 experiments [19]. NA48/2 gives an upper bound requiring ε max 3 In general the transitions between 8 Be * and 8 Be can be both isovector and isoscalar.…”

Section: Introductionmentioning

confidence: 99%

The 17 MeV Anomaly in Beryllium Decays and U(1) Portal to Dark Matter

Chen

Lin²,

Lin³

et al. 2017

Proceedings of the European Physical Society Conference on High Energy Physics — PoS(EPS-HEP2017)

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The experiment of Krasznahorkay et al observed the transition of a 8 Be excited state to its ground state and accompanied by an emission of e + e − pair with 17 MeV invariant mass. This 6.8σ anomaly can be fitted by a new light gauge boson. We consider the new particle as a U (1) gauge boson, Z , which plays as a portal linking dark sector and visible sector. In particular, we study the new U (1) gauge symmetry as a hidden or non-hidden group separately. The generic hidden U (1) model, referred to as dark Z model, is excluded by imposing various experimental constraints. On the other hand, a non-hidden Z is allowed due to additional interactions between Z and Standard Model fermions. We also study the implication of the dark matter direct search on such a scenario. We found the search for the DM-nucleon scattering cannot probe the parameter space that is allowed by 8 Be-anomaly for the range of DM mass above 500 MeV. However, the DM-electron scattering for DM between 20 and 50 MeV can test the underlying U (1) portal model using the future Si and Ge detectors with 5e − threshold charges.

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“…3 (left). The method was applied by the NA48 collaboration at the SPS/CERN [15], by WASA at COSY [16], HADES at GSI [17], as well as PHENIX at RHIC [18].…”

Section: Data Mining Campaigns Using Existing Data Setsmentioning

confidence: 99%

Review of dark photon searches

Denig

2016

EPJ Web Conf.

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Abstract. Dark Photons are hypothetical extra-U(1) gauge bosons, which are motivated by a number of astrophysical anomalies as well as the presently seen deviation between the Standard Model prediction and the direct measurement of the anomalous magnetic moment of the muon, (g − 2) μ . The Dark Photon does not serve as the Dark Matter particle itself, but acts as a messenger particle of a hypothetical Dark Sector with residual interaction to the Standard Model. We review recent Dark Photon searches, which were carried out in a global effort at various hadron and particle physics facilities. We also comment on the perspectives for future invisble searches, which directly probe the existence of Light Dark Matter particles. MotivationDark Photons are hypothetical particles of an extra U(1) gauge group. Such extra U(1) gauge groups are predicted by almost any extension of the Standard Model. Indeed, the related extra U(1) gauge bosons are searched for from the lowest (e.g. searches for axion-like particles) up to the highest energies at the LHC. Recently, the mass range for a vector particle in the MeV to GeV scale has been in the focus of interest due to the observation by Arkani Hamed et al. [1] that particles of such a mass scale might explain a surprisingly large number of astrophysical anomalies. In addition, it was realized that a Dark Photon of such a mass might explain the presently seen deviation between the direct measurement and the Standard Model prediction of the anomalous magnetic moment of the muon, (g − 2) μ [2]. . The lower diagram might give rise to the positron excess presently seen in the spectrum of cosmic rays, which is indeed one of the most striking astrophysical anomalies. Dark Matter (DM) particles annihilate via a Dark Photon into an e + e − pair. Within the kinetic mixing model two free parameters remain: the mass of the Dark Photon, m γ , and the mixing parameter , which parametrizes the strength of the coupling of the Dark Photon to ordinary Standard Model matter: 2 = α /α, where α is the QED fine structure constant. The possible relation of the Dark Photon to the Dark Matter problem as well as the fact that it might explain the (g − 2) μ puzzle, triggered an enormous theoretical and experimental interest in the particle

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Search for the dark photon inπ0decays

Cited by 313 publications

References 29 publications

Observation of Anomalous Internal Pair Creation in $^8$Be

Observation of Anomalous Internal Pair Creation in $^8$Be

The 17 MeV Anomaly in Beryllium Decays and U(1) Portal to Dark Matter

Review of dark photon searches

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