QED Meson Description of the X17 and Other Anomalous Particles

Abstract

The X17 particle, the E38 particle, and the anomalous soft photons are anomalous particles because they do not appear to belong to any known Standard Model families. We propose a QED meson description of the anomalous particles as composite systems of a light quark and a light antiquark bound and confined by the compact QED interaction, by combining Polyakov's transverse confinement of opposite electric charges in compact QED in (2+1)D and Schwinger's longitudinal confinement for massless opposite electric charges in QED in (1+1)D. With predicted QED meson masses close to the observed X17 and E38 masses, QED mesons may be good candidates for the description of the anomalous particles.

arXiv comment4 pages 3 figures, presented at the Workshop of "Shedding Light on X17", September 6-8, 2021, Centro Ricerche Enrico Fermi, Rome, Italy

References in corpus (91)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Final Report of the Muon E821 Anomalous Magnetic Moment Measurement at BNL
• Measurement of the Positive Muon Anomalous Magnetic Moment to 0.46 ppm
• Measurement of the fine-structure constant as a test of the Standard Model
• New Fixed-Target Experiments to Search for Dark Gauge Forces
• Exploring Portals to a Hidden Sector Through Fixed Targets
• The WIMPless Miracle: Dark Matter Particles without Weak-scale Masses or Weak Interactions
• FASER: ForwArd Search ExpeRiment at the LHC
• Observation of Anomalous Internal Pair Creation in ${}^8$Be: A Possible Signature of a Light, Neutral Boson
• FASER's Physics Reach for Long-Lived Particles
• Search for Invisible Decays of a Dark Photon Produced in e+e- Collisions at BaBar
• The Dark Photon
• U-boson production in e+e- annihilations, psi and Upsilon decays, and Light Dark Matter
• The design of the MEG II experiment
• Serendipity in dark photon searches
• New Limits on Hidden Photons from Past Electron Beam Dumps
• Thermal Relics in Hidden Sectors
• The Beam and detector of the NA62 experiment at CERN
• Search for light massive gauge bosons as an explanation of the $(g-2{)}_{\mu }$ anomaly at MAMI
• Protophobic Fifth Force Interpretation of the Observed Anomaly in ${}^8$Be Nuclear Transitions
• Accelerating the Discovery of Light Dark Matter
• Particle Physics Models for the 17 MeV Anomaly in Beryllium Nuclear Decays
• Search for Light Gauge Bosons of the Dark Sector at the Mainz Microtron
• New constraints on light vectors coupled to anomalous currents
• Dark forces coupled to non-conserved currents
• Limit on the production of a low-mass vector boson in ${\mathrm{e}}^{+}{\mathrm{e}}^{-}\to \mathrm{U}\gamma$, $\mathrm{U}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}$ with the KLOE experiment
• Improved limits on a hypothetical X(16.7) boson and a dark photon decaying into $e^{+}{e}^{-}$ pairs
• The 7Be(n,alpha)4He reaction and the Cosmological Lithium Problem: measurement of the cross section in a wide energy range at n_TOF (CERN)
• Technical design of the phase I Mu3e experiment
• Dark Matter Search in a Proton Beam Dump with MiniBooNE
• Magnetic Field Measurement and Analysis for the Muon g-2 Experiment at Fermilab
• A viable QCD axion in the MeV mass range
• Proposal to search for a dark photon in $e^{+}$ on target collisions at DA$\Phi$NE linac
• Search for direct CP violating charge asymmetries in $K^{\pm }\to {\pi }^{\pm }{\pi }^{+}{\pi }^{-}$ and $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ decays
• Measurement of the rare decay pi0 -> e+ e-
• A new anomaly observed in ${}^4$He supports the existence of the hypothetical X17 particle
• Light Weakly Coupled Axial Forces: Models, Constraints, and Projections
• Validity of the Weizsäcker-Williams Approximation and the Analysis of Beam Dump Experiments: Production of an axion, a dark photon, or a new axial-vector boson
• Dark photon production through positron annihilation in beam-dump experiments
• Consistent treatment of axions in the weak chiral Lagrangian
• The light U boson as the mediator of a new force, coupled to a combination of Q, B, L and dark matter
• A Resolution of the Flavor Problem of Two Higgs Doublet Models with an Extra U(1)_H Symmetry for Higgs Flavor
• Low Threshold Results and Limits from the DRIFT Directional Dark Matter Detector
• Light Axial Vectors, Nuclear Transitions, and the ${}^8$Be Anomaly
• Resonant production of dark photons in positron beam dump experiments
• Projections for Dark Photon Searches at Mu3e
• Explanation of the 17 MeV Atomki Anomaly in a $U(1{)}^{\prime }$-Extended 2-Higgs Doublet Model
• A novel way to search for light dark matter in lepton beam-dump experiments
• Can nuclear physics explain the anomaly observed in the internal pair production in the Beryllium-8 nucleus?
• Dynamical Evidence For a Fifth Force Explanation of the ATOMKI Nuclear Anomalies
• Realistic model for a fifth force explaining anomaly in ${}^{8}B{e}^{\ast }\to {}^{8}Be{e}^{+}{e}^{-}$ Decay
• A pair spectrometer for measuring multipolarities of energetic nuclear transitions
• Protophobic Light Vector Boson as a Mediator to the Dark Sector
• Atomki anomaly and dark matter in a radiative seesaw model with gauged $B-L$ symmetry
• Study of the Dependence of Direct Soft Photon Production on the Jet Characteristics in Hadronic Z^0 Decays
• Probing a dark photon using rare leptonic kaon and pion decays
• Atomki Anomaly in Family-Dependent $U(1{)}^{\prime }$ Extension of the Standard Model
• Radiative corrections to the Dalitz decay ${\pi }^0\to e^{+}{e}^{-}\gamma$ revisited
• Higgs phenomenology in Type-I 2HDM with U(1)_H Higgs gauge symmetry
• U(1)_A symmetry in two-doublet models, U bosons or light scalars, and psi and Upsilon decays
• New production channels for light dark matter in hadronic showers
• Can a protophobic vector boson explain the ATOMKI anomaly?
• The new interaction suggested by the anomalous ${}^8$Be transition sets a rigorous constraint on the mass range of dark matter
• Measurement of the ${\pi }^0$ electromagnetic transition form factor slope
• Signals of the QCD axion with mass of 17 MeV/c^2: nuclear transitions and light meson decays
• Resolving the $(g-2{)}_{\mu }$ and $B$ anomalies with leptoquarks and a dark Higgs boson
• The X17 boson and the ${}^3$H$(p,e^{+}{e}^{-}{)}^4$He and ${}^3$He$(n,e^{+}{e}^{-}{)}^4$He processes: a theoretical analysis
• New Physics Suggested by Atomki Anomaly
• Search for dark sector physics with NA64
• Is There a Sign of New Physics in Beryllium Transitions?
• Charge density as a driving factor of discharge formation in GEM-based detectors
• X(16.7) as the Solution of NuTeV Anomaly
• Anomalous Soft Photons in Hadron Production
• Search for pseudoscalar bosons decaying into $e^{+}{e}^{-}$ pairs in the NA64 experiment at the CERN SPS
• Operation and characterization of a windowless gas jet target in high-intensity electron beams
• Resonant search for the X17 boson at PADME
• Further search for a neutral boson with a mass around 9 MeV/c2
• An updated view on the ATOMKI nuclear anomalies
• Dark-Photon Search using Data from CRESST-II Phase 2
• Characterization and Performance of PADME's Cherenkov-Based Small-Angle Calorimeter
• The 17 MeV Anomaly in Beryllium Decays and $U(1)$ Portal to Dark Matter
• Open string QED meson description of the X17 particle and dark matter
• Challenges for a QCD Axion at the 10 MeV Scale
• Explaining Atomki anomaly and muon $g-2$ in $U(1{)}_X$ extended flavour violating two Higgs doublet model
• A multi-detector array for high energy nuclear e+e- pair spectrosocopy
• Search for new light vector boson using $J/\Psi$ at BESIII and Belle II
• 3D Particle Track Reconstrution in a Single Layer Cadmium-Telluride Hybrid Active Pixel Detector
• X17: A new force, or evidence for a hard $\gamma +\gamma$ process?
• Characterisation and performance of the PADME electromagnetic calorimeter
• XRF element localization with a triple GEM detector using resistive charge division
• NA48/2 studies of rare decays

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• Ab initio investigation of the ${}^7$Li($p,e^{+}{e}^{-}$)${}^8$Be process and the X17 boson
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• A Review of $\mu \to eee$, $\mu \to e\gamma$ and $\mu N\to eN$ Conversion
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• Primordial Black Holes Formation Beyond the Standard Cosmic QCD Transition
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