# Open-flavor charmed/bottom $sq\bar q\bar Q$ and $qq\bar q\bar Q$ tetraquark states

## TL;DR

This paper uses QCD sum rules to predict the mass spectrum of various open-flavor tetraquark states with different spins and parities, providing guidance for experimental searches of exotic states.

## Contribution

It offers the first comprehensive mass predictions for open-flavor charmed and bottom tetraquarks with multiple quantum numbers using a diquark-antidiquark framework.

## Key findings

- Mass spectra for $sqar qar c$, $qqar qar c$, $sqar qar b$, $qqar qar b$ tetraquarks predicted.
- Stable mass sum rules established within reasonable parameter ranges.
- Suggestions made for experimental searches of doubly-charged tetraquarks.

## Abstract

We provide comprehensive investigations for the mass spectrum of exotic open-flavor charmed/bottom $sq\bar q\bar c$, $qq\bar q\bar c$, $sq\bar q\bar b$, $qq\bar q\bar b$ tetraquark states with various spin-parity assignments $J^P=0^+, 1^+, 2^+$ and $0^-, 1^-$ in the framework of QCD sum rules. In the diquark configuration, we construct the diquark-antidiquark interpolating tetraquark currents using the color-antisymmetric scalar and axial-vector diquark fields. The stable mass sum rules are established in reasonable parameter working ranges, which are used to give reliable mass predictions for these tetraquark states. We obtain the mass spectra for the open-flavor charmed/bottom $sq\bar q\bar c$, $qq\bar q\bar c$, $sq\bar q\bar b$, $qq\bar q\bar b$ tetraquark states with various spin-parity quantum numbers. In addition, we suggest searching for exotic doubly-charged tetraquarks, such as $[sd][\bar u\bar c]\to D_s^{(\ast)-}\pi^-$ in future experiments at facilities such as BESIII, BelleII, PANDA, LHCb and CMS, etc.