Chiral Unitary Dynamics of Hadrons and Hadrons in a Nuclear Medium

摘要

In this talk I summarize recent findings around the description of axialvector mesons as dynamically generated states from the interaction ofpseudoscalar mesons and vector mesons, dedicating some attention to the two$K_1(1270)$ states. Then I review the generation of open and hidden charmscalar and axial states, and how some recent experiment supports the existenceof the new hidden charm scalar state predicted. I present recent resultsshowing that the low lying $1/2^+$ baryon resonances for S=-1 can be obtainedas bound states or resonances of two mesons and one baryon in coupled channels.Then show the differences with the S=0 case, where the $N^*(1710)$ appears alsodynamically generated from the two pion one nucleon system, but the $N^*(1440)$does not appear, indicating a more complex structure of the Roper resonance.Finally I shall show how the state X(2175), recently discovered at BABAR andBES, appears naturally as a resonance of the $\phi K \bar{K}$ system.