Threshold cusps and triangle singularities in hadronic reactions

被引：210
作者：
Guo, Feng-Kun [1 ,4 ]
Liu, Xiao-Hai [2 ,3 ]
Sakai, Shuntaro [1 ]
机构：
[1] Chinese Acad Sci, Inst Theoret Phys, CAS Key Lab Theoret Phys, Beijing 100190, Peoples R China
[2] Tianjin Univ, Sch Sci, Ctr Joint Quantum Studies, Tianjin 300350, Peoples R China
[3] Tianjin Univ, Sch Sci, Dept Phys, Tianjin 300350, Peoples R China
[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
来源：
PROGRESS IN PARTICLE AND NUCLEAR PHYSICS | 2020年 / 112卷
基金：
中国国家自然科学基金;
关键词：
Threshold cusps; Triangle singularities; Exotic hadrons; FINAL-STATE INTERACTIONS; NEUTRAL PION-PHOTOPRODUCTION; STRANGE-PARTICLE-PRODUCTION; COUPLED-CHANNEL ANALYSIS; RELATIVIZED QUARK-MODEL; CHIRAL DYNAMICS; MULTIQUARK HADRONS; HEAVY MESONS; ELECTROMAGNETIC CORRECTIONS; LOGARITHMIC SINGULARITIES;
D O I：
10.1016/j.ppnp.2020.103757
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
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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页数：54
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