Search for the dark photon in π0 decays

By J. R. Batley, J. Chèze, J. Derré, Evgueni Goudzovski, D. Cundy, N. Cartiglia, C. Lazzeroni, E. Mazzucato, M. Calvetti, A. Norton and 111 more. 2015

301 citations recorded by the source corpus.

Abstract A sample of 1.69 × 10 7 fully reconstructed π 0 → γ e + e − decay candidates collected by the NA48/2 experiment at CERN in 2003–2004 is analyzed to search for the dark photon ( A ′ ) production in the π 0 → γ A ′ decay followed by the prompt A ′ → e + e − decay. No signal is observed, and an exclusion region in the plane of the dark photon mass m A ′ and mixing parameter e 2 is established. The obtained upper limits on e 2 are more stringent than the previous limits in the mass range 9 MeV / c 2 m A ′ 70 MeV / c 2 . The NA48/2 sensitivity to the dark photon production in the K ± → π ± A ′ decay is also evaluated.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/97f2f405370fc0862117657feb99a32e472154b6

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In Nuclear and High Energy Physics

Citations in the corpus

The Dark Photon (2020, unknown): “Different dark-photon production mechanisms are used in the different experiments: meson decays (π0 → γA′, NA48/2 (Batley et al., 2015)), bremsstrahlung (e−Z → e−ZA′, A1 (Merkel et al., 2014)), annihilation (e+e− → γA′, BaBar (Lees et al., 2014)), and all these processes in different searches at…”
Revisiting Supernova 1987A constraints on dark photons (2016, methodology): “Above 2me, bounds from beam-dumps, B- and Φ-factories, fixed-target experiments, and precision measurements of the muon and electron (“ae”) anomalous magnetic moment are applicable [4, 12, 52–70].”
Particle physics models for the 17 MeV anomaly in beryllium nuclear decays (2016, unknown): “[44] NA48/2 Collaboration, J. R. Batley et al., “Search for the dark photon in π0 decays,” Phys.”
Physics beyond colliders at CERN: beyond the Standard Model working group report (2019, background): “NA48/2 [184], A1 [185] and BaBar [183] experiments put the strongest bounds for > 10−3 in the 0.”
Dark matter, millicharges, axion and scalar particles, gauge bosons, and other new physics with LDMX (2018, methodology): “[158] NA48/2 collaboration, J.”
Searching for long-lived particles beyond the Standard Model at the Large Hadron Collider (2019, unknown): “exclusion limits from the electron and muon anomalous magnetic moment [19, 595, 596], HADES [597], KLOE 2013 [598] and 2014 [599], the test run results from APEX [600], BaBar 2009 [601] and 2014 [602], beam dump experiments E137, E141, and E774 [603–605], A1 [606], Orsay [607], U70 [608], CHARM [609”
Deep Underground Neutrino Experiment (DUNE), Far Detector Technical Design Report, Volume II: DUNE Physics (2020, background): “We also show limits in the right panel from beam-dump experiments (where the dark photon is assumed to decay visibly if MV < 2Mχ) [464, 465, 466, 467, 468, 469], as well as the lower limits obtained from matching the thermal relic abundance of χ with the observed one (black).”
Neutrino Oscillations and Non-standard Interactions (2017, unknown): “On the other hand, for m Z (cid:48) m π , the bound from π 0 → γZ (cid:48) is g (cid:48) 3 × 10 − 3 [172].”