Masses of doubly heavy tetraquarks $QQ\bar{n}\bar{q}$ with $J^{P}=1^{+}$

TL;DR

This study uses QCD sum rules to calculate the masses of doubly heavy tetraquarks with $J^{P}=1^{+}$, identifying which are stable against strong decay and providing weak decay widths for some states.

Contribution

It provides the first precise mass estimates of doubly heavy tetraquarks with $J^{P}=1^{+}$ considering multifarious condensates up to dimension 10 and analyzes their stability against strong decay.

Findings

Nonstrange doubly-bottom tetraquarks are stable against strong decay.

A doubly-charmed tetraquark associated with $J_{3}$ is stable, while one associated with $J_{2}$ is unstable.

Weak decay widths of doubly bottom tetraquarks are estimated.

Abstract

We apply the method of QCD sum rules to study the doubly heavy tetraquark states $QQ\bar{q}\bar{n}$ with spin-parity $J^{P}=1^{+}$ and strangeness $S=0, -1$ using careful estimates of the Borel and threshold parameters involved. Masses of the doubly bottom and charmed tetraquarks with isospin $I=0,1/2, 1$ are computed precisely via taking into account multifarious condensates up to dimension $10$. Comparing with the two-heavy meson thresholds, we find that all nonstrange doubly-bottom tetraquarks and a doubly-charmed tetraquarks associted with $J_{3}$ with $J^{P}=1^{+}$ are stable against strong decay into two bottom mesons while a doubly-charmed tetraquarks associated with current $J_{2}$ is unstable against strong decay. By the way, weak decay widths of the doubly bottom tetraquarks are also given.