Flavour SU(3) symmetry, the new exotics Zcs(3082), Zcs(4003) and Y(4230) decays

by Prof. Luciano Maiani (Rome University)

Friday 2 Apr 2021, 15:00 → 16:00 Asia/Shanghai

Online

Abstract: 

BES III and LHCb have observed two open strangeness exotic resonances, Zcs(3985) and Zcs(4003). The near degeneracy of Zcs(3985) and Zcs(4003) reproduces the situation observed with X(3872) and Zc(3900). As tetraquarks, the Zcs resonances neatly fit into two SU(3)f nonets with JP = 1+ and opposite charge-conjugation, together with X(3872), X(4140) and Zc(3900). The mass of the missing element of the nonets is predicted. In the same framework, we study the decays of Y (4230) observed by BES III in e+e− annihilation. Results are compared to the decays D∗ → D π and D1→ D π decays, obtaining consistent results for the quark-pion coupling. We discuss briefly the steps to clarify the nature of the exotic states. 

Brief biography:  

Luciano Maiani is a distinguished visiting professor at Tsung-Dao Lee Institute. He is author or co-author of over 100 scientific publications on the theory of Elementary Particles. His most important result is the prediction of charmed particles (with S. Glashow and J. Iliopoulos, 1970). The proposal, known as the Glashow - Ilipoulos - Maiani (GIM) mechanism, has been critical to the formulation of the unified theory of the Electroweak Interactions. Charmed particles were discovered a few years later (1976) with properties very close to those anticipated in the original GIM paper.

Online Meeting room:  https://zoom.com.cn/j/69676551085

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TDLee_2021.pdf