Light axial-vector tetraquark state candidate: $a_1(1420)$

Abstract

In this article, we study the axial-vector tetraquark state and two-quark-tetraquark mixed state consist of light quarks using the QCD sum rules. The present predictions disfavor assigning the $a_1(1420)$ as the axial-vector tetraquark state with $J^{PC}=1^{++}$, while support assigning the $a_1(1420)$ as the axial-vector two-quark-tetraquark mixed state.

5 pages

References in corpus (1)

• Precision spectroscopy with COMPASS and the observation of a new iso-vector resonance

Cited by in corpus (4)

• Light isovector resonances in ${\pi }^{-}p\to {\pi }^{-}{\pi }^{-}{\pi }^{+}p$ at 190 GeV/$c$
• Observation of a new narrow axial-vector meson $a_1(1420)$
• Meson Spectroscopy at COMPASS
• Recent Results on Spectroscopy from COMPASS