Seminar “Hadron Physics”

Date and Time: Friday, 10 March 2023, at 11:00 AM

Venue: online seminar on Zoom, Blokhintsev hall (4th floor), Bogoliubov Laboratory of Theoretical Physics

Link to join the seminar on Zoom

Seminar topic: “Strong decays of charmonium-like state Y(4230) and radiative transitions of low-lying charmoniums”

Speaker: Gurjav Ganbold

Abstract:

Strong hidden-charm decays of the charmonium-like state Y(4320) as well as the dominant radiative transitions of the charmonium low-lying states have been studied in the framework of the covariant confined quark model.

The resonance Y has been interpreted as a four-quark state of the molecular type. The strong decay modes Y→π⁺π⁻J/Ψ and Y→K⁺K⁻J/Ψ have been studied by involving the scalar resonance state f₀(980). We have calculated the fractal widths of the related strong decays and the branching ratio B(Y→K⁺K⁻J/Ψ) / B(Y→π⁺π⁻J/Ψ), recently determined by the BESIII collaboration.

The gauge-invariant transition amplitudes have been expressed by either using the conventional Lorentz structures or the helicity amplitudes, when it was effective, by investigating the main radiative transitions of the charmonium S- and P-wave states. Only one adjustable parameter common to all six charmonium states has been introduced to describe the quark distribution inside the hadron. For the states J/Ψ(³S₁), χ_c0(³P₀), χ_c1(³P₁), h_c(¹P₁) and χ_c2(³P₂), we calculated the fractional widths of one-photon radiative decays.

Estimated results are in good agreement with the latest experimental data.