Recently, "Physical Review Letters" (Physical Review Letters) officially published the results of an experiment led by the University of Chinese Academy of Sciences particle physics experiment team. The Paper was published in PRL 112, 132001 (2014) under the signature of the Beijing Spectrometer BESIII Cooperation Group, and was selected as an editor recommended article. The core members of the research results are Professor Zheng Yangheng and Associate Professor Lv Xiaorui. They analyzed a new particle (resonance structure) Zc (4025) by analyzing the BESIII experimental data on the Beijing electron-positron collider. Because its decay produces a neutral excited meson excited state (contains a quark quark and an anti-upper quark) and a charged anti-union meson excited state (contains an anti-cano quark and a lower quark), so at least its components Contains four quarks. This has very similar properties to Zc (3900) discovered in the BESIII experiment last year, so Zc (4025) is most likely the Zc (3900) high-quality excited state.
The discovery of Zc (4025) in the final state of the positive and negative canon provides an important experimental basis for understanding the properties of the recently discovered Zc particle family (s), especially in distinguishing these particles from being in the four-quark or molecular state Above, the information it provides may become the key to understanding the quark composition structure inside the Zc series of particles.
Background note: The "quark model" in the current standard model of physics is limited to describing baryons containing three quarks and mesons containing a pair of positive and negative quarks. Most of the hadrons observed in particle physics experiments can be classified as baryons or mesons of the "quark model". The discovery of Zc (3900) and Zc (4025) provides important experimental evidence for confirming the existence of new forms of matter beyond the normal baryons and mesons in nature, and is of great scientific significance for improving our understanding of the most basic structure of matter in the universe. Has attracted great attention from the international particle physics community.
Zc discovered by BESIII (4025)
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