Speaker
Description
Neutral and charged decay modes of the X17 boson observed in dCu collisions at a momentum of 3.8 GeV/c per nucleon
Kh.U. Abraamyan$^{1,2 *}$, Ch. Austin$^{3}$, M.I.
Baznat$^{4}$,
K.K.~Gudima$^{4}$,
M.A. Kozhin$^{1}$,
S.G. Reznikov$^{1}$, and A.S. Sorin$^{1,5}$
$^1$VBLHEP JINR, 141980 Dubna, Moscow region, Russia\
$^2$International Center for Advanced Studies, YSU, 0025, Yerevan, Armenia\
$^3$ 33 Collins Terrace, Maryport, Cumbria CA15 8DL, England\
$^4$ Institute of Applied Physics, MD-2028 Kishinev, Moldova\
$^5$ BLTP JINR, 141980 Dubna, Moscow region, Russia
*E-mail: abraamyan@jinr.ru
Earlier (see [1]-[3]) we reported the observation of structures at about 17 and 38 MeV/$c^2$ in the invariant mass spectra of photon pairs.
The results of testing of the observed signals, including the results of the
Monte Carlo simulation support the conclusion
that the observed signals are the consequence of detection of the particles with
masses of about 17 and 38 MeV/$c^2$ decaying into a pair of photons.
A comparative analysis of two series of measurements with two scintillation counters switched on in coincidence and without them, all other conditions being equal, are performed.
Thus, together with the decay mode of $X17$ into two photons, the charged mode ($e^{+}e^{-}$) of the decay of X17 is also confirmed. According to preliminary estimates, the partial widths of
these decays are comparable.
[1]. Kh.U. Abraamyan et al., "Observation of Structures at $\sim$17 and $\sim$38 MeV/$c^2$ in the $\gamma\gamma$ Invariant Mass Spectrum in dCu Collisions at a
Momentum of 3.8 GeV/c per Nucleon," Physics of Particles and Nuclei, 2024, Vol. 55, pp. 868-873.
[2]. Kh.U. Abraamyan, "Check of the structure in photon pairs spectra at the invariant mass of about 17 MeV/$c^2$," Acta Physica Polonica B Proceedings Supplement {\bf 17}, 6-A1 (2024).
[3]. Kh.U. Abraamyan et al., arXiv:2311.18632v1 [hep-ex].
