High-Energy Pb-Emulsion Collisions at CERN and x17

[kodama]

this is a peer review journal

Journal of Physics G: Nuclear and Particle Physics

Search for new particles decaying into electron pairs of mass below 100 MeV/​

P L Jain and G Singh

Abstract​

We report results on 1220 electron pairs produced from a 207Pb beam at 160 A GeV in nuclear emulsion with invariant mass Q ranging between 1 and 100 MeV and lifetime τ between 10−15 s and 10−12 s. These electron pairs were produced at a distance of more than 50 µm from the primary interactions—this distance eliminates contamination due to Dalitz pairs. After subtracting the background pairs from the materialization of photons and also due to the decay of π0 → 2γ from the data, they exhibit enhancement at low mass Q = 6–20 MeV with narrow peaks at 7 ± 1 MeV, 19 ± 1 MeV and τ ⩽ 10−13 s.

Published 28 November 2006 • 2007 IOP Publishing Ltd
Journal of Physics G: Nuclear and Particle Physics, Volume 34,Number 1Citation P L Jain and G Singh 2007 J. Phys. G: Nucl. Part. Phys. 34 129DOI 10.1088/0954-3899/34/1/009

of interest

Dalitz pairs. After subtracting the background pairs from the materialization of photons and also due to the decay of π0 → 2γ from the data, they exhibit enhancement at low mass Q = 6–20 MeV with narrow peaks at 7 ± 1 MeV, 19 ± 1 MeV and τ ⩽ 10−13 s.

19 ± 1 MeV is in the range of mass of x17

is cited by

This paper, published in the International Journal of Modern Physics E in 2011 (Vol. 20, p. 1787), provides a re-analysis of electron-positron (\(e^{+}e^{-}\)) pair-production data

International Journal of Modern Physics E

A REEVALUATION OF EVIDENCE FOR LIGHT NEUTRAL BOSONS IN NUCLEAR EMULSIONS​

F. W. N. DE BOER
and
C. A. FIELDS

Abstract​

Electron–positron pair production data obtained by bombardment of emulsion detectors with either cosmic rays or projectiles with masses between 1 and 207 amu and kinetic energies between 18 GeV and 32 TeV have been reanalyzed using a consistent and conservative model of the background from electromagnetic pair conversion. The combined data yield a spectrum of putative neutral bosons decaying to e+e- pairs, with masses between 3 and 20 MeV/c2 and femtosecond lifetimes. The statistical significance against background for these "X-bosons" varies between 2σ and 8σ. The cross-section for direct production of X-bosons increases slowly with projectile energy, remaining over 1,000 times smaller than the pion production cross-section.

https://doi.org/10.1142/S021830131101960XCited by:7

High-Energy Pb-Emulsion Collisions

Cheuk-Yin Wong​

The invariant mass spectrum of pairs produced in high-energy Pb-emulsion collisions at 160 A GeV at CERN SPS exhibits a complex structure of many resonances resting on top of a broad enhancement at invariant masses below 50 MeV, with the prominent resonance at 19 1 MeV providing independent support for the hypothetical X17 particle. We show that this complex structure may be coherently described as signatures for the neutral color-singlet quark matter in both its deconfined and confined phases. That is, the broad enhancement may arise from thermal annihilation of QED(U(1))-deconfined quarks and antiquarks into pairs at the phase transition temperature (QED), theoretically estimated to be 4.75 1.2 MeV from the transitional equilibrium condition. The observed 3 1 and 7 1 MeV resonances may correspond to the QED(U(1))-deconfined and Coulomb bound states near their quark rest masses, respectively, whereas the observed 19 1 MeV resonance may correspond to the QED(U(1))-confined isoscalar QED meson. The approximate agreement between the theoretical and the experimental spectrum suggests that both QED(U(1))-confined and QED(U(1))-deconfined neutral color-singlet quark matter may have been produced in these high-energy Pb-emulsion collisions. We propose future experiments to confirm or refute these findings. Comments:

21 pages, 4 figures

Subjects:

	High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Theory (hep-th); Nuclear Theory (nucl-th)
Cite as:	arXiv:2604.23473 [hep-ph]

from the paper

It was
not that a single resonance was mis-identified at many different energies, as it was often assumed
in the search for a single elementary particle using e+e− pairs. It was just that there were many
3
e+e− resonances occurring at different energies showing up at many different experiments! All of
these earlier measurements were likely correct measurements corroborating the resonances in the
Pb-emulsion work in Fig. 1 of Jain and Singh [1]. The presence of the e+e− resonance at 19±1 MeV
in high-energy Pb-emulsion collisions further cross-confirm the existence of the hypothetical X17
particle observed at ATOMKI [35–39], DUBNA [40], and HUS [41] using very different methods
https://arxiv.org/pdf/2604.23473

does 1220 electron pairs produced from a 207Pb beam at 160 A GeV in x17 mass particle observed at ATOMKI 19 ± 1 MeV provide independent confirmation of x17 particle ?

CERN record 1220 ee pairs from lead in silver emulsion with mass 19mev, with range that overlays x17 mass particle observed at ATOMKI

F. W. N. DE BOER and C. A. FIELDS

the combined data yield a spectrum of putative neutral bosons decaying to e+e- pairs, with masses between 3 and 20 MeV/c2 and femtosecond lifetimes. The statistical significance against background for these "X-bosons" varies between 2σ and 8σ. The cross-section for direct production of X-bosons increases slowly with projectile energy, remaining over 1,000 times smaller than the pion production cross-section.
https://doi.org/10.1142/S021830131101960X

emulsion detectors have seen e+e- pairs, with masses between 3 and 20 MeV with statistical significance against background for these "X-bosons" varies between 2σ and 8σ like x17 mass particle observed at ATOMKI

so does CERN independent confirm x17 mass particle observed at ATOMKI using lead

F. W. N. DE BOER and P L Jain and G Singh are searching for new particles and x-boson at CERN via high-energy lead collisions and found 19mev resonance e+e- pairs about x17 mev

Cheuk-Yin Wong
Physics Division, Oak Ridge National Laboratory
Verified email at ornl.gov

Advisor:

John Archibald Wheeler

present
Oak Ridge
1966
PHD, Princeton U.
UNDERGRADUATE, Princeton U.

https://inspirehep.net/authors/983243

Princeton U is top tier physics Edward Witten

Cheuk-Yin Wong ""The invariant mass spectrum of pairs produced in high-energy Pb-emulsion collisions at 160 A GeV at CERN SPS exhibits a complex structure of many resonances resting on top of a broad enhancement at invariant masses below 50 MeV, with the prominent resonance at 19 1 MeV providing independent support for the hypothetical X17 particle." arXiv:2604.23473

so F. W. N. DE BOER and P L Jain and G Singh found evidence for new particles the x boson mass of 19 mev at Pb-emulsion collisions at 160 A GeV at CERN SPS and Cheuk-Yin Wong identity x-boson at CERN SPS with x17 by ATOMKI

do you think x boson mass of 19 mev at Pb-emulsion collisions at 160 A GeV at CERN SPS is evidence for x17 ?

of interest

We show that the process of Coherent Elastic neutrino (v) Nucleus Scattering (CEvNS) at nuclear reactor experiments has significant sensitivity to the so-called X17 particle, which has been invoked to explain the ATOMKI anomaly, wherein electron-positron pairs emerging from a nuclear transition of excited Be-8, He-4 and C-12 nuclei are studied.

Specifically, we fit CONUS+ and Dresden-II data and show that a robust statistical analysis renders these more compatible with the X17 hypothesis, in turn interfering with the Standard Model, than with that of the latter alone. The same stays true when also adding COHERENT data from pi+ decays at rest, singling out two regions of preferred couplings of the X17 to electron and muon neutrinos as well as nuclei.

Glimpses of the X17 from coherent elastic neutrino nucleus scattering
Johan Rathsman, Joakim Cederkäll, Yasar Hicyilmaz, Else Lytken, Stefano Moretti
https://arxiv.org/abs/2603.15246