Threshold effects and triangle singularities in hadronic reactions
题目: Threshold effects and triangle singularities in hadronic reactions
报告人: 郭奉坤
报告人单位: 中国科学院理论物理研究所
报告时间: 2020-07-17 16:00
报告地点: Online
主办单位: 粒子物理与原子核物理


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, 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 talk, I will the threshold cusps and triangle singularities in hadronic reactions, paying attention to their manifestations in phenomena related to exotic hadron candidates.
Ref: Feng-Kun Guo, Xiao-Hai Liu, Shuntaro Sakai, Prog. Part. Nucl. Phys. 112 (2020) 103757 [arXiv:1912.07030]





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