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Threshold cusps and triangle singularities in hadronic reactions

PROGRESS IN PARTICLE AND NUCLEAR PHYSICS (2020)

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PROGRESS IN PARTICLE AND NUCLEAR PHYSICS
卷 112, 期 -, 页码 -

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ELSEVIER
DOI: 10.1016/j.ppnp.2020.103757

关键词

Threshold cusps; Triangle singularities; Exotic hadrons

类别

Physics, Nuclear Physics, Particles & Fields

资金

  1. National Natural Science Foundation of China (NSFC) [11621131001]
  2. Deutsche Forschungsgemeinschaft (DFG) [11621131001, CRC110]
  3. NSFC, China [11835015, 11947302, 11975165, 11961141012]
  4. Chinese Academy of Sciences (CAS) [QYZDB-SSW-SYS013, XDPB09]
  5. CAS Center for Excellence in Particle Physics (CCEPP), China
  6. 2019 International Postdoctoral Exchange Program
  7. CAS President's International Fellowship Initiative (PIFI), China [2019PM0108]

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The spectrum of hadrons is the manifestation of color confinement of quantum chromodynamics. Hadronic resonances correspond to poles of the S-matrix. Since 2003, lots of new hadron resonant structures were discovered in the mass regions from light mesons to hadrons containing a pair of a heavy quark and an antiquark. Many of them are candidates of exotic hadrons, and they are usually observed as peaks in invariant mass distributions. However, the S-matrix also has kinematical singularities due to the on-shellness of intermediate particles for a process, such as two-body thresholds and triangle singularities (TSs), and they can produce peaks as well. On the one hand, such singularities may be misidentified as resonances; on the other hand, they can be used as tools for precision measurements. In this paper, we review the threshold cusps and various triangle singularities in hadronic reactions, paying attention to their manifestations in phenomena related to exotic hadron candidates. (C) 2020 Elsevier B.V. All rights reserved.

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