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SUMMARY:Luciano Maiani (Roma La Sapienza)
DTSTART:20210426T140000Z
DTEND:20210426T150000Z
DTSTAMP:20260423T003250Z
UID:IFTWeb/47
DESCRIPTION:Title: <a href="https://researchseminars.org/talk/IFTWeb/47/">
 The new exotics Zcs(3085)\, Zcs(4003)\, Y(4230) decays and Flavour SU(3)</
 a>\nby Luciano Maiani (Roma La Sapienza) as part of IFT-Madrid Webinars\n\
 n\nAbstract\nNew data from BES III and LHCb indicate the existence of two 
 hidden charm\, open strangeness resonances\, Zcs(3985) and Zcs(4003). The 
 near degeneracy of Zcs(3985) and Zcs(4003) reproduces\, in the strange sec
 tor\, the situation observed with X(3872) and Zc(3900). We show that\, in 
 the tetraquark picture\, the Zcs resonances\, together with X(3872)\, X(41
 40) and Zc(3900)\, neatly fit into two nonets of flavour SU(3)\, with JP =
  1+ and opposite charge-conjugation. The mass of  the missing element of t
 he nonets is predicted. \nIn the same framework\, we have made a study of 
 the decays of Y(4230) observed by BES III in e+e- annihilation. Results ar
 e compared with the well studied decays D∗ → D π decays\, obtaining c
 onsistent results for the quark-pion coupling. We extend the discussion to
  the decay B -> K phi J/Psi where the signal of Zcs(4003) has been observe
 d by LHCb.\n  These results represent a significative score in favour of t
 he tetraquark model. We discuss briefly further steps necessary to clarify
  the nature of the exotic states under study.\n
LOCATION:https://researchseminars.org/talk/IFTWeb/47/
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