The Hydrogen Bond of QCD

Abstract

Using the Born-Oppenheimer approximation, we show that exotic resonances, X and Z, may emerge as QCD molecular objects made of colored two-quark lumps, states with heavy-light diquarks spatially separated from antidiquarks. With the same method we confirm that doubly heavy tetraquarks are stable against strong decays. Tetraquarks described here provide a new picture of exotic hadrons, as formed by the QCD analog of the hydrogen bond of molecular physics.

5 pages, 3 figures, comments and references added. Table 1 extended

References in corpus (11)

• Multiquark Resonances
• Discovery of doubly-charmed Xi_{cc} baryon implies a stable (b b ubar dbar) tetraquark
• Heavy-quark symmetry implies stable heavy tetraquark mesons $Q_i{Q}_j{\bar{q}}_k{\bar{q}}_l$
• The Z(4430) and a New Paradigm for Spin Interactions in Tetraquarks
• Hadro-Charmonium
• Exotic tetraquark states with the $qq\bar{Q}\bar{Q}$ configuration
• A Theory of X and Z Multiquark Resonances
• Tetraquark operators in lattice QCD and exotic flavour states in the charm sector
• The Born-Oppenheimer approximation in an effective field theory language
• The Dynamical Diquark Model: First Numerical Results
• Would a Deeply Bound $b\bar{b}b\bar{b}$ Tetraquark Meson be Observed at the LHC?

Cited by in corpus (3)

• Masses of doubly heavy tetraquarks $T_{Q{Q}^{\prime }}$ in a relativized quark model
• The Hydrogen Bond of QCD in Doubly Heavy Baryons and Tetraquarks
• Triply-heavy tetraquarks in an extended relativized quark model