ELFT HÍRADÓ

[paragi AT sol.cc.u-szeged.hu]

Tisztelt Lista!

Az előző levélről sajnálatosan lemaradt a pontos helyszín (terem  
megjelölés), illetve ide is bemásolom Prof. Varró Sándor által  
megadott irodalomjegyzéket, valamint reményeim szerint próbálom  
korrigálni az előző levélben tapasztalt karakterproblémákat.

Az előadás pontos adatai tehát a következőek:

Előadó: Prof. Varró Sándor, ELI, ERIC, ALPS Facility, Szeged, Hungary.

Cím:  Mass Formulas for the X17 and E38 Particles, and the Proton Size Puzzle.


Időpont: 2024. május 16., 14 óra
Helyszín: PTE Fizika Intézet (Pécs, Ifjúság útja 6.) Jeges-terem (A-408)

Absztrakt

The angular correlations of electron-positron pairs, stemming from the  
products of several nuclear reactions, i.e. 7Li(p,e+e-)8Be,  
3H(p,e+e-)4He, 11B(p,e+e-)12C, systematically show an anomaly at large  
relative angles, called the ATOMKI anomaly [1-3]. In each cases the  
observed effect can be explained by assuming the existence of a  
neutral boson, the X17 particle, having an invariant mass of 17  
MeV/c^2 [1-3]. Other experiments on reactions like 63Cu(d,gg)65Zn show  
anomalous gamma diphoton (gg) correlations around the invariant mass  
38 MeV/c^2 [4]. This may indicate the existence of the so-called E38  
particle, mediating energy and momentum from the decaying products.

In the present talk we show that it is possible to derive the  
above-mentioned masses, on the basis of quantum electrodynamics. For  
this purpose we use the exact solutions of the Dirac equation of the  
system of a charged particle and quantized electromagnetic plane waves  
[5]. We have long realized that these non-perturbative solutions  
contain such kind of frequency blue-shift of the radiation quanta,  
which appears as an effective mass in the dispersion relation. In a  
recent application of these property of the solutions, we have taken  
the proton as the interacting charge, and derived a formula, which  
yields the value 17.0087 MeV/c^2 for the invariant mass of the X17  
particle [6]. By applying this same  method to the udd quark-photon  
plasma associated to the neutron, we receive a similar analytic  
formula, leading to the value 37.9937 MeV/c^2 for the invariant mass  
of the E38 particle [6]. We note that, besides the Sommerfeld fine  
structure constant and the nucleon masses, the derived formulas  
contain merely some elementaty statistical factors.

In our considerations a natural connection appears between the mass of  
the X17 particle and the proton size, the latter being a subject of  
intensive research, with puzzling outcomes [7,8]. We shall briefly  
review this subject, and higlight the just-mentioned connection in our  
scheeme, which delivers the value 0.846299 fm for the proton radius  
[6], and 0.845135 fm for the neutron radius. Each of these radii are  
smaller, by a factor of 0.640452, than the respective Compton  
wavelengths.

References.
[1] Krasznahorkay A J, Csatlós M, Csige L, et al., Observation of  
anomalous internal pair creation in
8Be : a possible indication of a light, neutral boson. Phys. Rev.  
Lett. 116, 042501 (2016).
[2] Krasznahorkay A J, Krasznahorkay A, Csatlós M, Csige L, et al.,  
Observation of the X17 anomaly
in the decay of the Giant Dipole Resonance of 8Be. arXiv:2308.06473 (2023).
[3] Ahn T T, Trong T D, Krasznahorkay A J, et al., Checking the  
anomaly with a two-arm electon
positron pair spectrometer. Universe 2024, 10, 168. See
[4] Abraamyan K, Austin C, Baznat M, Check of the structure in photon  
pairs spectra at the invariant
mass of about 38 MeV/c2. EJP Web of Conferences 204, 08004 (2019). See  
also arXiv: 2311.18632.
[5] Varró S, Theoretical study of the interaction of free electrons  
with intense light. (Ph.D.
dissertation, 1981). Hungarian Physical Journal XXXI, 399-454 (1983).
[6] Varró S, Proposal for an electromagnetic mass formula for the X17  
particle. Universe 2024, 10,
86. [https://doi.org/10.3390/universe10020086]. [Based on the talk  
presented at ISMD 2023 - 52nd
International Symposium on Multiparticle Dynamics, August 21-25 2023 -  
Gyöngyös, Hungary.
This article belongs to the Special Issue "Multiparticle Dynamics",  
Edited by Csörgő T, Csanád M and
Novák T; https://www.mdpi.com/journal/universe/special_issues/3R2XYDMCV9].
[7] Pohl R, Antognini A, Nez F, et al., The size of the proton. Nature  
466, 213-216 (2010).
[8] Udem Th, Quantum electrodynamics and the proton size. Nature  
Physics 14, 632 (2018)



Minden érdeklődőt szívesen látunk.


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Gábor Paragi, PhD

Dep. of Theoretical Physics at the University of Pécs
(https://www.ttk.pte.hu/munkatarsak/a-kar-munkatarsai/dr-paragi-gabor)
email: paragi AT gamma.ttk.pte.hu
Dep. of Theoretical Physics at the University of Szeged
email: paragi AT sol.cc.u-szeged.hu
Dep. of Medicinal Chemistry at the University of Szeged


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