Quark-Antiquark Effective Potential in Symplectic Quantum Mechanics

TL;DR

This paper investigates the quark-antiquark bound state using Symplectic Quantum Mechanics, solving the Schrödinger equation with a Cornell potential in phase space, and analyzing the non-classicality of the system via Wigner functions.

Contribution

It introduces a novel phase space approach to the Cornell potential problem, combining algebraic and perturbative methods within Symplectic Quantum Mechanics.

Findings

Ground state Wigner function related to Airy functions analyzed.

Eigenfunctions obtained via algebraic and perturbative methods.

Non-classicality of meson states visualized through negativity of Wigner functions.

Abstract

In this paper, we study within the structure of Symplectic Quantum Mechanics a bi-dimensional non-relativistic strong interaction system which represent the bound state of heavy quark-antiquark, where we consider a Cornell potential which consists of Coulomb-type plus linear potentials. First, we solve the Schr\"odinger equation in the phase space with the linear potential. The solution (ground state) is obtained and analyzed by means of the Wigner function related to Airy function for the $c\overline{c}$ meson. In the second case, to treat the Schr\"odinger-like equation in the phase space, a procedure based on the Bohlin transformation is presented and applied to the Cornell potential. In this case, the system is separated into two parts, one analogous to the oscillator and the other we treat using perturbation method. Then, we quantized the Hamiltonian with the aid of stars operators in the phase space representation so that we can determine through the algebraic method the eigenfunctions of the undisturbed Hamiltonian (oscillator solution), and the other part of the Hamiltonian was the perturbation method. The eigenfunctions found (undisturbed plus disturbed) are associated with the Wigner function via Weyl product using the representation theory of Galilei group in the phase space. The Wigner function is analyzed, the non-classicality of ground state and first excited state is studied by the non-classicality indicator or negativity parameter of the Wigner function for this system. In some aspects, we observe that the Wigner function offers an easier way to visualize the non-classic nature of meson system than the wavefunction does.