Heavy holographic exotics: Tetraquarks as Efimov states

Journal Article · 24 December 2019 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.100.126023 · OSTI ID:1580304

Liu, Yizhuang ^[1]; Nowak, Maciej A. ^[2]; Zahed, Ismail ^[3]

---

1. Shanghai Jiao Univ. (China)
2. Jagiellonian University, Kraków (Poland)
3. Stony Brook Univ., NY (United States)

We provide a holographic description of nonstrange multiquark exotics as compact topological molecules by binding heavy-light mesons to a tunneling configuration in $$\text{D8-D}\bar{8}$$ that is homotopic to the vacuum state with a fixed Chern-Simons number. In the tunneling process, the heavy-light mesons transmute to fermions. Their binding is generic and arises from a trade-off between the dipole attraction induced by the Chern-Simons term and the U(1) fermionic repulsion. In the heavy quark limit, the open-flavor tetraquark exotics $$QQ\bar{q}\bar{q}$$ and $$\bar{Q}\bar{Q}qq$$ emerge as bound Efimov states in a degenerate multiplet $IJ^π = (00^+, 01^+)$ with opposite intrinsic Chern-Simons numbers $$±\frac{1}{2}$$. The hidden-flavor tetraquark exotics such as $$Q\bar{Q}q\bar{q}$$, $$QQ\bar{Q}\bar{q}$$, and $$QQ\bar{Q}\bar{Q}$$ as compact topological molecules are unbound. Other exotics are also discussed.

• Research Organization: State Univ. of New York (SUNY), Albany, NY (United States)
• Sponsoring Organization: USDOE Office of Science (SC); National Science Centre of Poland (NCN); USDOE
• Grant/Contract Number: FG02-88ER40388; UMO-2017/27/B/ST2/01139; FG-88ER40388
• OSTI ID: 1580304
• Alternate ID(s): OSTI ID: 1800697
• Journal Information: Physical Review. D., Vol. 100, Issue 12; ISSN 2470-0010
• Publisher: American Physical Society (APS)Copyright Statement
• Country of Publication: United States
• Language: English