Elucidating the nature of axial-vector charm-antibottom tetraquark states

TL;DR

This paper analyzes the magnetic moments of exotic $Z_{\bar b c}$ tetraquark states using QCD light-cone sum rules, aiming to distinguish their internal structures and quantum numbers despite similar masses.

Contribution

It provides the first detailed calculation of magnetic moments for $Z_{\bar b c}$ tetraquarks within the diquark-antidiquark framework, highlighting their potential to reveal internal structure differences.

Findings

Magnetic moments differ noticeably despite similar masses.

Heavy quarks influence the sign and magnitude of magnetic moments.

Results can help distinguish quantum numbers and internal configurations.

Abstract

Investigating the electromagnetic characteristics of unconventional states may offer new insights into their internal structures. In particular, the magnetic moment attributes may serve as a crucial physical observable for differentiating exotic states with disparate configurations or spin-parity quantum numbers. As a promising avenue for research, encompassing both opportunities and challenges, an in-depth examination of the electromagnetic properties of exotic states is crucial for advancing our understanding of unconventional states. Motivated by this, in this study, the magnetic moments of $ \rm{I(J^{P})} = 1(1^{+})$ $Z_{\bar b c}$ tetraquark states are analyzed in the framework of QCD light-cone sum rules by considering the diquark-antidiquark approximation, designated as type $3_c \otimes \bar 3_c$. Although the tetraquark states examined in this study have nearly identical masses, their magnetic moment results exhibit noticeable discrepancies. This may facilitate the differentiation between quantum numbers associated with states with identical quark content. The results show that heavy quarks overcoming light quarks can determine both the sign and the magnitude of the magnetic moments of these tetraquark states. The numerical results obtained in this study suggest that the magnetic moments of $Z_{\bar b c}$ tetraquark states may reveal aspects of their underlying structure, which could distinguish between their spin-parity quantum numbers and their internal structure. The results obtained regarding the magnetic moments of the $Z_{\bar b c}$ tetraquark states may be checked within the context of different phenomenological approaches.