15,102 research outputs found
Some insights into the newly observed in by LHCb
The newly reported exotic signal by the LHCb Collaboration in the
invariant mass spectrum of in has been
a new experimental evidence for an exotic meson containing four constituent
quarks. Although the present experimental information is very limited, we show
that its correlations with some existing exotic candidates can be recognized.
This signal can be either caused by final state interaction effects or a
-wave resonance state arising from the interaction. For the
latter option its neutral partner will have exotic quantum numbers of
. This signal, if confirmed, would provide important
clues for dynamics for producing multiquark systems in meson decays and
annihilations.Comment: 6 pages, 2 eps figure
Charmonium hadronic decays and the OZI rule violation effects
We discuss the scalar meson mixing scenario and present an OZI rule violation
mechanism for understanding the scalar productions in charmoium hadronic
decays. We stress that the OZI violation could play a key role in disentangling
the structure of the scalars: , and .Comment: Proceeding of the International Workshop on Tau-Charm Physics,
Beijing, China, June 5-7, 200
Quarks, diquarks and QCD mixing in the resonance spectrum
We identify a " selection rule" for resonances in the presence
of QCD mixing effects. We quantify these mixing effects from existing data and
predict amplitudes for exciting {\bf 20} representations in SU(6), which are
forbidden in strict diquark models. By classifying Particle-Data-Group (PDG)
states at N=2, we show that , , ,
, and are ideal probes of baryon dynamics
and for establishing whether strongly correlated diquarks survive for .Comment: Extended version accepted by PR
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