Check of the structure in photon pairs spectra at the invariant mass of about 38 MeV/<i>c</i><sup>2</sup>

Abraamyan, Khachik; Austin, Chris; Baznat, M. I.; Gudima, K.K.; Kozhin, M. A.; Reznikov, S. G.; Sorin, Alexander

doi:10.1051/epjconf/201920408004

Cited by 22 publications

(32 citation statements)

References 5 publications

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“…It is also useful to inquire whether there can be additional experimental tests to confirm or refute such proposed QED mesons. For example, the mass of the isovector (I(J π ) = 0(0 − ), I 3 = 0) QED meson predicted in [34] is close to the mass of the hypothetical E38 boson observed with an invariant mass of about 38 MeV in highenergy pC, dC, dCu reactions at Dubna [32,33] and suggested earlier in [53,54]. There are furthermore possible γγ invariant mass structures at 10-15 MeV and 38 MeV in pp, and π − p reactions in COMPASS experiments [55][56][57][58][59][60][61].…”

Section: Jhep08(2020)165mentioning

confidence: 72%

“…It happens as if the X17 particle and the anomalous soft photons are not perplexing enough, there occurs in addition the perplexing E38 boson particle with a mass of about 38 MeV observed in the γγ invariant mass spectrum in high-energy pC, dC, dCu reactions at Dubna [32,33]. The extra-ordinariness of these objects at the mass scale of many tens of MeV appears to place them outside the domain of the Standard Model.…”

Section: Jhep08(2020)165mentioning

confidence: 99%

“…In table 1, we have also listed the hypothetical X17 particle observed in [1,16] and the hypothetical E38 particle observed in [32,33] as possible QED meson candidates because their measured invariant masses appear to be close to the masses of the predicted isoscalar and isovector QED mesons, respectively. It will be of great interest to confirm or refute the existence these hypothetical particles by independent experimental investigations, as a test of the QED meson concepts.…”

Section: Jhep08(2020)165mentioning

confidence: 99%

“…Diagrams 1(b) and 1(c) may describe the simultaneous production of QCD mesons JHEP08(2020)165 and QED mesons in the anomalous soft photon phenomenon in high-energy hadron-proton reactions, when a fraction of the produced particles C i and D i are QED mesons while the dominant fraction are QCD mesons. The produced QED mesons subsequently decay into e + e − pairs as anomalous soft photons in [24][25][26][27] or as γγ pairs in [32,33,[55][56][57][58].…”

Section: Production Of the Qcd And Qed Mesonsmentioning

confidence: 99%

“…Recently, a boson particle with invariant a mass of about 38 MeV (labeled as the hypothetical E38 particle) decaying into γγ pairs has been observed at Dubna in highenergy {pC, dC, dCu} → γγX collisions at proton and deuteron incident energies of 5.5, 2.76, and 3.83 GeV per nucleon, respectively [32,33]. The observed E38 mass coincides, within the experimental and theoretical uncertainties, with the predicted mass of 36.4 ± 3.8 MeV for the isovector [I(J π ) = 0(0 − ), I 3 = 0] QED meson, making the isovector QED meson a good candidate for the E38 particle.…”

Section: Production Of the Qcd And Qed Mesonsmentioning

confidence: 99%

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Open string QED meson description of the X17 particle and dark matter

Wong

2020

J. High Energ. Phys.

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As a quark and an antiquark cannot be isolated, the intrinsic motion of a composite qq system in its lowest-energy states lies predominantly in 1+1 dimensions, as in an open string with the quark and the antiquark at its two ends. Accordingly, we study the lowest-energy states of an open string qq system in QCD and QED in 1+1 dimensions. We show that π 0 , η, and η can be adequately described as open string qq QCD mesons. By extrapolating into the qq QED sector in which a quark and an antiquark interact with the QED interaction, we find an open string isoscalar I(J π) = 0(0 −) QED meson state at 17.9±1.5 MeV and an isovector (I(J π) = 1(0 −), I 3 = 0) QED meson state at 36.4±3.8 MeV. The predicted masses of the isoscalar and isovector QED mesons are close to the masses of the hypothetical X17 and E38 particles observed recently, making them good candidates for these particles. The decay products of QED mesons may show up as excess e + e − and γγ pairs in the anomalous soft photon phenomenon associated with hadron productions in high-energy hadron-proton collisions and e +-e − annihilations. Measurements of the invariant masses of excess e + e − and γγ pairs will provide tests for the existence of the open string qq QED mesons. An assembly of gravitating QED mesons are expected to emit electron-positron pairs and/or gamma rays and their decay energies and lifetimes will be modified by their gravitational binding energies. Consequently, a self-gravitating isoscalar QED meson assembly whose mass M and radius R satisfy (M/M)/(R/R) 4.71 × 10 5 will not produce electron-positron pairs nor gamma rays and may be a good candidate for the primordial dark matter.

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Section: Jhep08(2020)165mentioning

confidence: 72%

Section: Jhep08(2020)165mentioning

confidence: 99%

Section: Jhep08(2020)165mentioning

confidence: 99%

Section: Production Of the Qcd And Qed Mesonsmentioning

confidence: 99%

Section: Production Of the Qcd And Qed Mesonsmentioning

confidence: 99%

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Open string QED meson description of the X17 particle and dark matter

Wong

2020

J. High Energ. Phys.

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On the question of quark confinement in the Abelian U(1) QED gauge interaction

Wong

2023

Front. Phys.

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QED Mesons, the QED Neutron, and the Dark Matter

Wong

2022

EPJ Web Conf.

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Schwinger’s boson solution for massless fermions in QED in 1+1D has been applied and generalized to quarks interacting in QED and QCD interactions, leading to stable and confined open-string QED and QCD boson excitations of the quark-QCD-QED system in 1+1D. Just as the open-string QCD excitations in 1+1D can be the idealization of QCD mesons with a flux tube in 3+1D, so the open-string QED excitations in 1+1D may likewise be the idealization of QED mesons with masses in the tens of MeV region, corresponding possibly to the anomalous X17 and E38 particles observed recently. A further search for bound states of quarks interacting in the QED interaction alone leads to the examination on the stability of the QED neutron, consisting of two d quarks and one u quark. Theoretically, the QED neutron has been found to be stable and estimated to have a mass of 44.5 MeV, whereas the analogous QED proton is unstable, leading to a long-lived QED neutron that may be a good candidate for the dark matter.

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Check of the structure in photon pairs spectra at the invariant mass of about 38 MeV/c²

Cited by 22 publications

References 5 publications

Open string QED meson description of the X17 particle and dark matter

Open string QED meson description of the X17 particle and dark matter

On the question of quark confinement in the Abelian U(1) QED gauge interaction

QED Mesons, the QED Neutron, and the Dark Matter

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Check of the structure in photon pairs spectra at the invariant mass of about 38 MeV/c2

Cited by 22 publications

References 5 publications

Open string QED meson description of the X17 particle and dark matter

Open string QED meson description of the X17 particle and dark matter

On the question of quark confinement in the Abelian U(1) QED gauge interaction

QED Mesons, the QED Neutron, and the Dark Matter

Contact Info

Product

Resources

About

Check of the structure in photon pairs spectra at the invariant mass of about 38 MeV/c²