Triangle Singularities and XYZ Quarkonium Peaks

  title={Triangle Singularities and XYZ Quarkonium Peaks},
  author={Adam P. Szczepaniak},
  • Adam P. Szczepaniak
  • Published 2015
  • Physics
  • We discuss analytical properties of partial waves derived from projection of a 4-legged amplitude with crossed-channel exchanges in the kinematic region of the direct channel that corresponds to the XYZ peaks in charmonium and bottomonium. We show that in general partial waves can develop anomalous branch points in the vicinity of the direct channel physical region. In a specific case, when these branch points lie on the opposite side of the unitary cut they pinch the integration contour in a… CONTINUE READING

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