Shedding light on X17: community report

Alves, Daniele S. M.; Barducci, D.; Cavoto, G.; Rose, Luigi Delle; Doria, L.; Feng, Jonathan L.; Frankenthal, A.; Gasparian, A.; Goudzovski, E.; Gustavino, C.; Khalil, S.; Kozhuharov, V.; Krasznahorkay, A.; Marchi, T.; Meucci, M.; Miller, Gerald A.; Moretti, Stefano; Nardecchia, Marco; Nardi, Enrico; Luz, H. Natal da; Organtini, G.; Papa, A.; Perrevoort, A.; Petousis, V.; Piperno, G.; Raggi, M.; Renga, F.; Schwendimann, P.; Sýkora, Rudolf; Toni, Claudio; Valente, P.; Voena, C.; Wong, Cheuk-Yin; Zhang, Xilin

doi:10.1140/epjc/s10052-023-11271-x

Cited by 17 publications

(21 citation statements)

References 199 publications

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“…Many of these experiments have already put constraints on the coupling of this hypothetical particle to ordinary matter. Others are still in the development phase, but hopefully they will soon contribute to a deeper understanding of this phenomenon as concluded by the community report of the Frascati conference [6].…”

Section: Introductionmentioning

confidence: 99%

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A new light particle is being born

Begala

Csatlós

Csige

et al. 2022

J. Phys.: Conf. Ser.

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A few years ago we observed anomalous electron-positron angular correlations for the 18.15 MeV M1 transition of 8Be. This was interpreted as the creation and decay of an intermediate bosonic particle with a mass of m 0 c 2=16.70±0.35(stat )±0.5(sys) MeV, which is now called X17. The possible relation of the X17 boson to the dark matter problem triggered an enormous interest in the wider physics community. We also observed a similar anomaly in 4He, which could be described also by the creation and subsequent decay of the same X17 particle. Very recently, the 11B proton capture reaction was used for exciting the 17.2 MeV broad (Γ=1.15 MeV) resonance in 12C and studying their internal pair creation decay. Anomalies were observed in the angular correlation of the electron-positron pairs, which together with the 8Be and 4He data provides kinematic evidence for the X17 particle and supports their vector boson and fifth force explanation.

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Section: Introductionmentioning

confidence: 99%

“…The possible relation of the X17 boson to the dark matter problem triggered an enormous interest in the wider physics community [5]. New results will hopefully be published soon on the X17 particle from a few different experiments [6].…”

Section: Introductionmentioning

confidence: 99%

A new light particle is being born

Begala

Csatlós

Csige

et al. 2022

J. Phys.: Conf. Ser.

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“…accelerator and a Li 2 B 4 O 7 target which are normally used for calibration purposes [28]. The collaboration has taken first data for this measurement.…”

Section: Pos(fpcp2023)015mentioning

confidence: 99%

A Review of $\mu \to eee$, $\mu \to e \gamma$ and $\mu N \to eN$ Conversion

Perrevoort

2023

Proceedings of 21st Conference on Flavor Physics and CP Violation — PoS(FPCP2023)

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“…The ATOMKI observation of the hypothetical X17 particle has generated a great deal of interest [24][25][26][27][28][29][30][31][32]. Although the mass of the hypothetical X17 particle was close to the isoscalar QED meson predicted earlier in [24], the X17 boson led to many speculations as discussed in the Proceedings of the Workshop on "Shedding lights on the X17" [42]. The proposed models include the QED meson [24][25][26][27][28][29][30][31][32], the axion [49], the fifth force of Nature [50], a dark photon [53], new physics particles [54], the Framed Standard Model [55][56][57][58], Higgs doublet [59], a 12-quark state [62], a light pseudoscalar [63], and dressed QED radiation [71].…”

Section: Introductionmentioning

confidence: 98%

“…23 MeV I(J π )=1(1 − ) excited 12 C state to the 12 C ground state [41]. Updates of the ATOMKI measurements on the hypothetical X17 particle have also been presented [42][43][44]. In a recent measurement in the decay of the 8 Be 18.15 MeV state to the 8 Be ground state in the proton fusion on 7 Li, the Hanoi University of Science reported the observation of a significant structure, which indicates a hypothetical neutral boson with a mass of about 16.7 MeV decaying into e + e − , in support of the earlier ATOMKI observation [45].…”

Section: Introductionmentioning

confidence: 99%

QED Meson Description of the Anomalous Particles at ∼17 and ∼38 MeV

Wong

2024

Universe

Self Cite

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The Schwinger confinement mechanism stipulates that a massless fermion and a massless antifermion are confined as a massive boson when they interact in the Abelian QED interaction in (1+1)D.If we approximate light quarks as massless and apply the Schwinger confinement mechanism to quarks, we can infer that a light quark and a light antiquark interacting in the Abelian QED interaction are confined as a QED meson in (1+1)D. Similarly, a light quark and a light antiquark interacting in the QCD interaction in the quasi-Abelian approximation will be confined as a QCD meson in (1+1)D. The QED and QCD mesons in (1+1)D can represent physical mesons in (3+1)D when the flux tube radius is properly taken into account. Such a theory leads to a reasonable description of the masses of π0,η, and η′, and its extrapolation to the unknown QED sector yields an isoscalar QED meson at about 17 MeV and an isovector QED meson at about 38 MeV. The observations of the anomalous soft photons, the hypothetical X17 particle, and the hypothetical E38 particle bear promising evidence for the possible existence of the QED mesons. Pending further confirmation, they hold important implications on the properties on the quarks and their interactions.

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Shedding light on X17: community report

Cited by 17 publications

References 199 publications

A new light particle is being born

A new light particle is being born

A Review of $\mu \to eee$, $\mu \to e \gamma$ and $\mu N \to eN$ Conversion

QED Meson Description of the Anomalous Particles at ∼17 and ∼38 MeV

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