Speaker
Jose R. Pelaez
(Universidad COmplutense)
Description
We study the large Nc behavior of couplings among light meson states with
different compositions in terms of quarks and gluons. We shortly review the
most common compositions of mesons, which are of interest for the
understanding of low-lying meson resonances, namely, the ordinary
quark-antiquark states as well as the non-ordinary, glueball, tetraquark,
etc. We dedicate special attention to Jaffe's generalization of the
tetraquark with Nc-1 quark-antiquark pairs, that is the only type of state
we have identified, whose width does not necessarily vanish
with large Nc while it does decouple exponentially with Nc from the
pion-pion channel, so that is weakly coupled to the meson-meson system.
(see arXiv:1405.4831)
Author
Jose R. Pelaez
(Universidad COmplutense)
Co-authors
Prof.
Felipe J. Llanes Estrada
(Universidad Complutense)
Dr
Jacobo Ruiz de Elvira
(Bonn. Univ. HISKP)
Thomas Cohen
(University of Maryland)
