Abstract
Motivated by the latest discovery of a new tetraquark T c c + with two charm quarks and two light antiquarks by LHCb Collaboration, we investigated the D D ∗ hadronic molecule interpretation of T c c + . By calculation, the mass and the decay width of this new structure T c c + can be understood in one-meson exchange potential model. The binding energies for these D D ∗ hadronic molecules with J P = 1 + are around 1 MeV. Besides, we also studied the possible beauty partners T b b 10598 of hadronic molecule T c c + , which may be feasible in future LHCb experiments.
Highlights
The quantum chromodynamics (QCD) theory tells us that some exotic states such as multiquark states or gluon-participated states, which are apart from the conventional configurations, may be confined into a color-singlet hadron
The earliest evidence of exotic states is the X(3872) discovered by the Belle Collaboration in 2003, which lies above the two open charm meson threshold but has a very narrow decay width (Γ < 1:2 MeV) [1]
The vector and scalar light mesons may bring new effects in the binding and decay properties of the near-threshold doubly charm tetraquark states in one-meson exchange potential (OMEP) model, but these effects are expected to be suppressed as O ðm2π/m2V,SÞ according to the power counting rules
Summary
Hadron spectroscopy provides a unique window for us to understand the fundamental strong interactions. The LHCb Collaboration has released a more profound decay analysis [6]; the mass and decay width of T+cc are updated as δm = mT+cc −ðmD∗+ + mD0 Þ = −361 ± 40 keV, ð2Þ ΓT+cc = 47:8 ± 1:9 keV: The LHCb exotic state T+cc has an electrical charge and two charm quantum numbers and leads to a strong evidence of least quark content 1⁄2ccud. We will study the mass and decays of doubly charm tetraquarks in one-meson exchange potential (OMEP) model.
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