Algorithm

Meson

Nuclear physics

Particle physics

Computer science

Tetraquark

Physics

Scalar (mathematics)

Mathematics

QCD sum rules

Parity (physics)

Geometry

Isospin

Quantum chromodynamics

State (computer science)

The European Physical Journal A

In the present work, we investigate the scalar, axialvector and tensor doubly-charmed tetraquark molecular states without strange, with strange and with doubly-strange via the QCD sum rules, and try to make assignment of the $$T^+_{cc}$$ from the LHCb collaboration in the scenario of molecular states. The predictions favor assigning the $$T^+_{cc}$$ to be the lighter $$DD^{*}$$ molecular state with the spin-parity $$J^P=1^+$$ and isospin $$I=0$$ , while the heavier $$DD^{*}$$ molecular state with the spin-parity $$J^P=1^+$$ and isospin $$I=1$$ still escapes experimental detections, the observation of the heavier $$DD^{*}$$ molecular state would shed light on the nature of the $$T_{cc}^+$$ . All the predicted doubly-charmed tetraquark molecular states can be confronted to the experimental data in the future.

Analysis of the doubly-charmed tetraquark molecular states with the QCD sum rules