Traps in hadron spectroscopy: Thresholds, triangle singularities, etc

Abstract

The knowledge of hadron spectrum is based on experimental observations of hadronic resonances. The resonances are normally observed as peaks in certain invariant mass distributions. However, neither is a peak necessarily due to the presence of a resonance, nor does a resonance necessarily lead to a peak. Kinematic singularities can also produce peaks. Here, we discuss such possibilities and methods distinguishing genuine resonances from kinematic effects.

11 pages, 3 figures. Plenary talk at the XVII International Conference on Hadron Spectroscopy and Structure (HADRON2017), 25-29 Sept., 2017, Salamanca, Spain

References in corpus (7)

• Hadronic molecules
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• Search for the X(5568) state decaying into ${\mathrm{B}}_{\mathrm{s}}^0{\pi }^{\pm }$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
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• Unitarity, Analyticity and Crossing Symmetry in Two- and Three-hadron Final State Interactions
• The $Z_c(3900)$ peak does not come from the "triangle singularity"

Cited by in corpus (4)

• Charm-meson Triangle Singularity in $e^{+}{e}^{-}$ Annihilation into $D^{\ast 0}{\bar{D}}^0+\gamma$
• Triangle Singularity in the Production of $X(3872)$ and a Photon in $e^{+}{e}^{-}$ Annihilation
• Production of $X(3872)$ and a Photon in $e^{+}{e}^{-}$ Annihilation
• Peaks and cusps: anomalous thresholds and LHC physics