On the description of exotic hadron states within QCD sum rules

Abstract

Revisiting the QCD sum-rule description of exotic hadron states, we argue that, in order to arrive at trustable analyses of, for instance, strong decay widths of multiquarks, it is inevitable to adopt the QCD sum-rule approach beyond the leading perturbative level.

arXiv comment8 pages, 3 figures, talk presented at "Quark Confinement and the Hadron Spectrum XII" (28 August - 3 September 2016, Thessaloniki, Greece)

References in corpus (42)

• QCD at Low Energies
• New Charmonium States in QCD Sum Rules: a Concise Review
• QCD Sum Rules, a Modern Perspective
• Tetraquark Mesons in Large $N$ Quantum Chromodynamics
• An Illustrative Example of How Quark-Hadron Duality Might Work
• The $Z_b(10610)$ and $Z_b(10650)$ as axial-vector tetraquark states in the QCD sum rules
• Narrow Tetraquarks at Large N
• Charged Exotic Charmonium States
• Photon--meson transition form factors $\gamma {\pi }^0$, $\gamma \eta$ and $\gamma {\eta }^{\prime }$ at low and moderately high $Q^2$
• The effective continuum threshold in dispersive sum rules
• OPE, charm-quark mass, and decay constants of D and D_s mesons from QCD sum rules
• Decay constants of heavy pseudoscalar mesons from QCD sum rules
• Decay constants of the charmed vector mesons $D^{\ast }$ and $D_s^{\ast }$ from QCD sum rules
• Systematic uncertainties of hadron parameters obtained with QCD sum rules
• Quark structure of the pion and pion form factor
• Universal ${\tau }_{1/2}(y)$ Isgur-Wise Function at the Next-to-Leading Order in QCD Sum Rules
• Quark-Hadron Duality
• Are There Tetraquarks at Large $N_c$ in QCD(F)?
• The Isgur-Wise Function to $O({\alpha }_s)$ from Sum Rules in the Heavy Quark Effective Theory
• Extraction of ground-state decay constant from dispersive sum rules: QCD vs potential models
• Can one control systematic errors of QCD sum rule predictions for bound states?
• Pion form factor at spacelike momentum transfers from local-duality QCD sum rule
• A QCD sum rule calculation of the $X^{\pm }(5568)\to B_s^0{\pi }^{\pm }$ decay width
• Accuracy of bound-state form factors extracted from dispersive sum rules
• Hadron form factors from sum rules for vacuum-to-hadron correlators
• Nature of the X(5568) : a critical Laplace sum rule analysis at N2LO
• Effective continuum threshold for vacuum-to-bound-state correlators
• Accurate bottom-quark mass from Borel QCD sum rules for $f_B$ and $f_{B_s}$
• Pion form factor and QCD sum rules: case of axial current
• Pion elastic and $({\pi }^0,\eta ,{\eta }^{\prime })\to \gamma {\gamma }^{\ast }$ transition form factors in a broad range of momentum transfers
• Bound-state parameters from dispersive sum rules for vacuum-to-vacuum correlators
• Quantum-Number Exotic Tetraquarks at Large $N_c$ in QCD(AS)
• The puzzle of the π-> γγ* transition form factor
• Extraction of bound-state parameters from dispersive sum rules
• Accurate decay-constant ratios $f_{B^{\ast }}/f_B$ and $f_{B_s^{\ast }}/f_{B_s}$ from Borel QCD sum rules
• Universal behaviour of the ${\gamma }^{\ast }\gamma \to ({\pi }^0,\eta ,{\eta }^{\prime })$ transition form factors
• Quark-hadron duality and hadron properties from correlators of pseudoscalar and axial currents
• On the ${\gamma }^{\ast }\gamma \to \pi (\eta ,{\eta }^{\prime })$ transition form factors
• Accuracy of the pion elastic form factor extracted from a local-duality sum rule
• Pion form factor and QCD sum rules: case of pseudoscalar current
• The ${\gamma }^{\ast }{\gamma }^{\ast }\to {\eta }_c$ transition form factor
• ${\bar{D}}^{\ast }D$ and ${\bar{B}}^{\ast }B(1^{++})$ molecules at N2LO from QSSR