Conveners
Hadron spectroscopy, multiquarks
- Хачик Абраамян (JINR, Dubna)
Hadron spectroscopy, multiquarks
- Ганболд Гуржав (Joint Institute for Nuclear Researches (JINR))
The isospin violation in the strong decays of the spin-2 exotic charmonium-like state $X_2(4014)$ into channels $\omega J/\Psi$ and $\rho^0 J/\Psi$ has been studied within the framework of the covariant confined quark model, designed to eliminate any UV divergences in quark loops. We have interpreted the exotic hadron $X_2$ as a four-quark state with a $D^*\bar{D}^*$ molecular-type...
Nuclear states, beginning with the six-quark Fock component of the deuteron, cannot be described solely in terms of conventional nucleon, meson, and isobar degrees of freedom in view of the presence of hidden-color states in any color-singlet multi-quark system. The momentum distribution of quarks in a nucleus is not a simple superposition of their distributions within nucleons. The EMC...
The charge asymmetry in the process $e^+e^-\to\pi^+\pi^-\pi^0\gamma$ is studied taking into account a longitudinal polarization of electrons (positrons) for photons with energies $\omega_\gamma\ll\sqrt{s}$. The asymmetry arises due to interference of amplitudes corresponding to production of pions in states with charge parity odd and charge parity even. One of the contributions to the charge...
The resonance peak observed by WASA@COSY in the total cross section of the reaction of two-pion production in the isoscalar channel of the reaction $pn\to d\pi^0\pi^0$ [1] at invariant mass 2380 MeV with the width of 70 MeV, is considered as one of the most realistic candidate to the dibaryon resonance [2]. The isospin of this resonance is I=0 and spin-parity $J^P=3^+$. A similar...
Within the framework of the quark model and the hyperspherical coordinate method, we study the bound states of four heavy quarks (tetraquarks). In the hypercentral approximation, the Schrödinger equation is reduced to a one-dimensional equation after averaging over the hyperspherical angles. An analytical solution to this equation was obtained using the variational method, along with a...
The search for glueballs – colorless bound states of gluons – is one of the most important tasks within the modern QCD. While parameters of glueballs are predicted under a wide range of models, their experimental observation is extremely difficult due to the mixing with the conventional mesons. Glueballs are predicted to be abundantly produced in glue-rich processes, such as charmonia decays....
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,...
