Multiquark states in the covariant quark confinement model

TL;DR

This paper reviews applications of a covariant quark model to study multiquark states, including mesons, baryons, and tetraquarks, providing calculations of form factors, decay widths, and static properties.

Contribution

It introduces a comprehensive covariant quark model framework for analyzing multiquark states and their properties, including the X(3872) tetraquark candidate.

Findings

Form factors for B(B_s)-> P(V) transitions evaluated across all momentum transfers.

Decay widths for specific B_s and X(3872) decay channels calculated.

Static properties of nucleons and hyperons described within the model.

Abstract

This talk reviews the last applications of the covariant quark model for studying the properties of the multiquark states: B_s-meson (quark-antiquark state), light baryons (three-quark states) and tetraquark (four-quark state). The form factors of the B(B_s)-> P(V)-transitions are evaluated in the full kinematical region of momentum transfer squared. The widths of some B_s-nonleptonic decays are calculated. The static properties of the proton and neutron, and the \Lambda-hyperon (magnetic moments and charge radii) and the behavior of the nucleon form factors at low momentum transfers are described. The consequences of treating the X(3872) meson as a tetraquark bound state are explored. The decay widths of the observed channels X->J/\psi+2\pi (3\pi) and X-> \bar D^0 + D^0+\pi^0 via the intermediate off--shell states X-> J/\psi+\rho(\omega) and X-> \bar D + D^* are calculated. Its one-photon decay X-> \gamma+ J/\psi is also analyzed.