Diquark-antidiquarks with hidden or open charm and the nature of X(3872)

By L. Maiani, F. Piccinini, A. Polosa, V. Riquer. 2004

562 citations recorded by the source corpus.

Heavy-light diquarks can be the building blocks of a rich spectrum of states which can accommodate some of the newly observed charmoniumlike resonances not fitting a pure $c\overline{c}$ assignment. We examine this possibility for hidden and open charm diquark-antidiquark states deducing spectra from constituent quark masses and spin-spin interactions. Taking the $X(3872)$ as input we predict the existence of a ${2}^{++}$ state that can be associated to the $X(3940)$ observed by Belle and reexamine the state claimed by SELEX, $X(2632)$. The possible assignment of the previously discovered states ${D}_{s}(2317)$ and ${D}_{s}(2457)$ is discussed. We predict $X(3872)$ to be made of two components with a mass difference related to ${m}_{u}\ensuremath{-}{m}_{d}$ and discuss the production of $X(3872)$ and of its charged partner ${X}^{\ifmmode\pm\else\textpm\fi{}}$ in the weak decays of ${B}^{+,0}$.

Subfields: Condensed Matter Physics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/8d8e1e050f698f62a5a9db3b77297bd8e3fe6e07

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In Condensed Matter Physics

1. S. Godfrey
2. S. Olsen
3. Xiang Liu
4. E. Swanson
5. Alexander Zaitsev
6. J. Camalich
7. E. Klempt

In Nuclear and High Energy Physics

1. Xiang Liu
2. Shi-Lin Zhu
3. S. Godfrey
4. E. Swanson
5. Alessandro Pilloni
6. S. Olsen
7. R. Mitchell
8. T. Skwarnicki

Citations in the corpus

• The Exotic XYZ Charmonium-Like Mesons (2008, methodology): “In the model of Maiani et al (40), the tetraquark is described as a diquarkdiantiquark structure in which the quarks group into colour-triplet scalar and vector clusters and the interactions are dominated by a simple spin-spin interac-”
• Pentaquark and Tetraquark States (2019, background): “In this diquark approximation, the Hamiltonian for q1q2q̄3q̄4 tetraquark states has the form [95, 96] H = m[q1q2] +m[q3q4] + 2(κq1q2)3̄(Sq1 · Sq2) + 2(κq3q4)3̄(Sq̄3 · Sq̄4) + 2κq1q̄3(Sq1 · Sq̄3) +2κq1q̄4(Sq1 · Sq̄4) + 2κq2q̄3(Sq2 · Sq̄3) + 2κq2q̄4(Sq2 · Sq̄4) + 2A~ L · (~ Sq1q2 + ~ Sq̄3q̄4) + B 2 ~ ”
• Glueballs, Hybrids, Multiquarks. Experimental facts versus QCD inspired concepts (2007, background): “Spectrum of tetraquark charmonium states [825].”
• Physics case for an LHCb Upgrade II - Opportunities in flavour physics, and beyond, in the HL-LHC era (2018, background): “Although the true nature of the X(3872) meson is still unclear, both the molecular [483] and tetraquark [484] models predict that a C-odd partner (X(3872)C−odd) and charged partners (X(3872)±) may exist and decay to J/ψη/γχcJ and J/ψπ0π± respectively.”
• Hadronic molecules (2017, background): “However, a precision measurement of its mass is necessary to really distinguish a molecular X(3872) from, e.g., a tetraquark scenario (Esposito et al., 2015b; Maiani et al., 2005).”