Observation of structures at ∼17 and ∼38 MeV/c2 in the γγ invariant mass spectra

[kodama]

TL;DR Summary

The results of an analysis

I'm waiting for PADME run 3 and MEG II

from Russia not Hungry

could someone review

arXiv:2311.18632 (hep-ex)
[Submitted on 30 Nov 2023]
Observation of structures at ∼17 and ∼38 MeV/c2 in the γγ invariant mass spectra in pC, dC, and dCu collisions at plab of a few GeV/c per nucleon
Kh.U. Abraamyan, Ch. Austin, M.I. Baznat, K.K. Gudima, M.A. Kozhin, S.G. Reznikov, A.S. Sorin

.... Signals in the form of enhanced structures at invariant masses of about 17 and 38 MeV/c2 are observed....
...The test results support the conclusion that the observed signals are the consequence of detection of the particles with masses of about 17 and 38 MeV/c2 decaying into a pair of photons....

Subjects:	High Energy Physics - Experiment (hep-ex)
Cite as:	arXiv:2311.18632 [hep-ex]

conclusion of the paper

Thus, the statistics in the observed structure about 17 MeV/c2 is more than 11 standard
deviations.

reference section c page 8

the internal beams of the Nuclotron at JINR.

independent of the Atomki institute in Hungary verify x17 existence by more than 11 standard deviations.

also
Angling for Insights: Illuminating Light New Physics at Mu3e through Angular Correlations
#2

Simon Knapen
, Kevin Langhoff
, Toby Opferkuch
, Diego Redigolo

(Nov 29, 2023)

e-Print:
2311.17913 [hep-ph]

 

[kodama]

1 physicist has review the results from γγ invariant mass spectra by Abraamyan et al. at JINR.

High Energy Physics - Phenomenology
arXiv:2312.02763 (hep-ph)
[Submitted on 5 Dec 2023]
QCD sum rule studies on the possible double-peak structure of the X17 particle
Hua-Xing Chen

"The X17 particle, discovered by Krasznahorkay et al. at ATOMKI, was recently confirmed in the γγ invariant mass spectra by Abraamyan et al. at JINR. We notice with surprise and interest that the X17 seems to have a double-peak structure."

Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2312.02763 [hep-ph]

Hua-Xing Chen

Beihang University (BUAA) | BUAA · Department of Physics​

PhD
194
Publications
https://www.researchgate.net/profile/Hua-Xing-Chen

 

[kodama]

JINR.=Joint Institute for Nuclear Research​

Research areas​

The main areas of theoretical and experimental research at JINR are Particle Physics, Nuclear Physics and Condensed Matter Physics. The research programme of JINR is aimed at obtaining highly significant results of principal scientific value.

http://www.jinr.ru/about-en/

 

[Vanadium 50]

Confirmed by the same group that discovered the E(38) - which nobody else ever saw. And the Z(57) - which nobody else ever saw. And a particle at 360 MeV - which nobody else ever saw.

Golly, these guys must be really great experimenters, as they keep seeing things nobody else seems to be able to.

 

[kodama]

Confirmed by the same group that discovered the E(38) - which nobody else ever saw. And the Z(57) - which nobody else ever saw. And a particle at 360 MeV - which nobody else ever saw.

Golly, these guys must be really great experimenters, as they keep seeing things nobody else seems to be able to.

I was wondering about E(38), apparently a new scalar

arXiv:2311.14099 (hep-ph)
[Submitted on 23 Nov 2023]
Explaining ATOMKI, (g−2)μ, and MiniBooNE anomalies with light mediators in U(1)H extended model
Sumit Ghosh, Pyungwon Ko

We consider U(1)H extensions of Type-I 2HDM plus a singlet scalar ϕH, introducing a new Higgs doublet H2 and a singlet ϕH charged under U(1)H
....... The U(1)H symmetry breaks due to the vacuum expectation values of H2 and ϕH, leading to the emergence of a light vector boson with a mass of approximately 17 MeV. This vector boson interacts with fermions through mass mixing and kinetic mixing process involving other neutral gauge bosons. Furthermore, alongside the light vector boson, another light scalar particle with a mass around 10--100 MeV may arise from scalar sector mixing....

Comments: 32 pages, 4 figures, 3 tables
Subjects: High Energy Physics - Phenomenology (hep-ph)
Cite as: arXiv:2311.14099 [hep-ph]

explains
∼17 and ∼38 MeV/c2 E(38) as a a new Higgs doublet H2

 

[Vanadium 50]

These guys have been finding and unfinding and refinding the E(38) for at least fifteen years now. Originally they even thought it was the Higgs. It wasn't. And nobody else can seem to see it.

This huy is more credible:

 

[kodama]

These guys have been finding and unfinding and refinding the E(38) for at least fifteen years now. Originally they even thought it was the Higgs. It wasn't. And nobody else can seem to see it.

This huy is more credible:

okay
but many papers predicts more light scalar particles with a mass around 10--100 MeV may arise from scalar sector mixingso I would keep an open mind

 

[ohwilleke]

This paper has going for it the fact that it tries to explain the claimed experimental result with purely Standard Model physics. A QED meson is a lot less of a big deal than a new fundamental particle. This said, I'm still skeptical.

[Submitted on 7 Jan 2024]

QED meson description of the anomalous particles at ~17 and ~38 MeV​

Cheuk-Yin Wong

Approximating light quarks as massless, we apply the Schwinger confinement mechanism to light quarks and infer that a light quark and a light antiquark interacting in the QED interaction are confined and bound 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 are confined and bound 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 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.

Comments:	27 pages. arXiv admin note: text overlap with arXiv:2208.09920
Subjects:	High Energy Physics - Phenomenology (hep-ph)
Cite as:	arXiv:2401.04142 [hep-ph]

 

[kodama]

Checking the 88Be anomaly with a two-arm electron positron pair spectrometer
#1

Tran The Anh
, Tran Dinh Trong

(Jan 21, 2024)

VNU-University of Science, Vietnam National University,
334 Nguyen Trai, Hanoi, Vietnam;
2 Institute of Physics, Vietnam Academy of Science and Technology,
18 Hoang Quoc Viet, Hanoi, Vietnam;
3 Institute for Nuclear Research (HUN-REN ATOMKI),
P.O. Box 51, H-4001 Debrecen, Hungary
4 Institute for Nuclear Science and Technology,
VINATOM, 179 Nghia Do, Hanoi, Vietnam;
5 Hanoi Irradiation Center, VINATOM, Cau Dien, Hanoi, Vietnam

e-Print:
2401.11676 [nucl-ex]

We have repeated the experiment performed recently by Krasznahorkay et al., (Phys. Rev. Lett. 116, 042501 (2016)), which may indicate a new particle called X17 in the literature. In order to get a reliable, and independent result, we used a different type of electron-positron pair spectrometer which have a more simple acceptance/efficiency as a function of the correlation angle, but the other conditions of the experiment were very similar to the published ones. We could confirm the presence of the anomaly measured at the Ex=18.15 MeV resonance, and also confirm their absence at the Ex=17.6 MeV resonance, and at Ep= 800 keV off resonance energies.

The aim of this article is to look for the 8Be anomaly at the VNU University of Science
(HUS) with a two-arm electron-positron spectrometer specifically designed, and built for
this purpose.

page 3

Summary
We successfully built a two-arm e+e− spectrometer in Hanoi. The spectrometer was
tested and calibrated using the 17.6 MeV M1 transition excited in the 7Li(p,e+e−)8Be
reaction. We have got a nice agreement between the experimentally determined acceptan

section 4 summary

this experiment was done at VNU Vietnamso experiment done in Russia and one in Vietnam both confirm X17

also worth mentioning

Beam diagnostics with silicon pixel detector array at PADME experiment

S. Bertelli(
Frascati
)
, F. Bossi(
Frascati
)
, C. Di Giulio(
Frascati
)
, E. Di Meco(
Frascati
)
, K. Dimitrova(
Sofiya U.
)

Jan 16, 2024
9 pages
Published in:

JINST 19 (2024) 01, C01016

Published: Jan 16, 2024

DOI:

10.1088/1748-0221/19/01/C01016

Abstract: (IOP)
During 2022 data taking (Run III) PADME searched for a resonant production and a visible decay of the X17 particle into e++e−−. A precise knowledge within 1% uncertainty of the number of positrons was required for the observation. To that purpose, an array of 2 × 6 Timepix3 (total of 512 × 1536 pixels) hybrid pixel detectors operated in data-streaming mode with ToA resolution of 1.56 ns for every pixel was employed. Two methods for data acquisition were developed. A frame-based method, integrating the number of hits for each individual pixel for a predefined period of time served for monitoring the beam conditions and to provide a rough estimation of the beam distribution and number of positrons. A data streaming mode exploiting the nanosecond time resolution of Timepix3 detector was used for precise characterization of the transverse beam profile and the distribution of the incident positrons within each bunch of ∼ 200 ns duration.

 

[Vanadium 50]

so experiment done in Russia and one in Vietnam both confirm X17

Horse manure.

Sorry, but there is no other word for it.

First, an experiment by the same people is not an independent confirmation. I see you neglected to mention that Krasznahorkay and son authored the paper. You might have fooled most of PF, but you didn't fool me.

Second, they did NOT see the X17 at 140 degrees. They see nothing there, but they do see a bump at 135. They try and tap dance their way through it, with "maybe it's this and maybe it's that" but it's not kosher to look at the result and only then to start trying to explain that your experiment may not be as accurate as you though - but still accurate enough to confirm.

Fact of the matter is the Hungary result excludes the Vietnam result and vice versa.

Color me disgusted.

I don't know what is worse: posting the paper without reading it, or reading it and posting it anyway.

Finally, trotting out another PADME non-result is certainly not confirming anything. Just adding noise.

 

[berkeman]

After a Mentor discussion, thread is now closed.