Searching for the rules that govern hadron construction

Abstract

Just as Quantum Electrodynamics describes how electrons are bound in atoms by the electromagnetic force, mediated by exchange of photons, Quantum Chromodynamics (QCD) describes how quarks are bound inside hadrons by the strong force, mediated by exchange of gluons. At face value, QCD allows hadrons constructed from increasingly many quarks to exist, just as atoms with increasing numbers of electrons exist, yet such complex constructions seemed, until recently, to not be present in nature. In what follows we describe advances in the spectroscopy of mesons that are refining our understanding of the rules for building hadrons from QCD.

arXiv commentFixed issue in document source that resulted in the omission of Fig. 3

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• 50 Years of Quantum Chromodynamics
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• Deciphering the nature of X(3872) in heavy ion collisions
• Light-Meson Spectroscopy with COMPASS
• Novel approaches in Hadron Spectroscopy
• S-matrix analysis of the baryon electric charge correlation
• Model Selection for Pion Photoproduction
• Production of exotic tetraquarks $QQ\bar{q}\bar{q}$ in heavy-ion collisions at the LHC
• Data-driven dispersive analysis of the $\pi \pi$ and $\pi K$ scattering
• Scalar and tensor charmonium resonances in coupled-channel scattering from QCD
• Excited $J^{--}$ meson resonances at the SU(3) flavor point from lattice QCD
• ${\pi }^{-}p\to {\eta }^{(\prime )}{\pi }^{-}p$ in the double-Regge region
• The role of charged exotic states in $e^{+}{e}^{-}\to \psi (2S){\pi }^{+}{\pi }^{-}$
• Density of States of a Coupled-Channel System
• Measurement of beam asymmetry for ${\pi }^{-}{\Delta }^{++}$ photoproduction on the proton at $E_{\gamma }$=8.5 GeV
• Toponium: the smallest bound state and simplest hadron in quantum mechanics
• Analytical dispersive parameterization for elastic scattering of spinless particles
• The MC-QTAIM: A framework for extending the atoms in molecules analysis beyond purely electronic systems
• Hyperspherical-coordinate approach to the spectra and decay widths of hybrid quarkonia
• Nature of $X(2370)$
• Recent progress on hadron spectroscopy from lattice QCD
• The Joint Physics Analysis Center: Recent results