Abstract
I discuss the properties of some representative XYZ mesons in the context of the most commonly proposed models for their underlying nature.
Highlights
Consistent with an X(3872) → ρJ/ψ, ρ → π+π− decay chain
The proximity of MX(3872) to the D0D ∗0 mass threshold and the plausibility of Törnqvist’s arguments encouraged us to believe that the X(3872) was the harbinger of a new spectroscopy of open-charmed meson-meson molecules bound by nuclear-physics-like forces, as first advocated in 1976 [13,14,15]
The properties of these states, which are collectively known as the XYZ mesons, have been extensively reviewed and are generally well known
Summary
The study of hadron spectroscopy had enormous success in the latter part of the twentieth century, when the charmonium (cc) and bottomonium (bb) mesons were discovered and it was established that the mass spectra of these states, and many of their properties, could be accurately described by the Quarkonium model, which is based on non-relativistic Quantum Mechanics with a simple potential comprised of a coulombic short-ranged component smoothly coupled to a linearly rising “confining” term at larger distances. One of the big surprises from the B-factory experiments was the discovery of mesons with decay final states that include a c- and a c-quark that cannot be assigned to any of the remaining unassigned levels of the charmonium spectrum. The first of these charmoniumlike states to be observed was the X(3872) that was seen by Belle as a distinct narrow peak in the π+π− J/ψ invariant mass distribution in B → Kπ+π− J/ψ decays [2] (see Fig. 2).
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