Hybridized Tetraquarks

TL;DR

This paper introduces hybridized-tetraquarks, a new class of exotic hadrons that are neither purely tetraquark nor molecular states, inspired by atomic physics Feshbach states, explaining recent experimental observations.

Contribution

It proposes the concept of hybridized-tetraquarks and a formation mechanism inspired by Feshbach states, offering a new interpretation of X, Z resonances in hadron physics.

Findings

Explains the nature of X, Z resonances using hybridized-tetraquarks.

Provides a framework for understanding recent experimental results.

Discusses states with quantum numbers similar to X(5568).

Abstract

We propose a new interpretation of the neutral and charged X, Z exotic hadron resonances. Hybridized-tetraquarks are neither purely compact tetraquark states nor bound or loosely bound molecules. The latter would require a negative or zero binding energy whose counterpart in h-tetraquarks is a positive quantity. The formation mechanism of this new class of hadrons is inspired by that of Feshbach metastable states in atomic physics. The recent claim of an exotic resonance in the Bs pi+- channel by the D0 collaboration and the negative result presented subsequently by the LHCb collaboration are understood in this scheme, together with a considerable portion of available data on X, Z particles. Considerations on a state with the same quantum numbers as the X(5568) are also made.