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Chiral Unitary Dynamics of Hadrons and Hadrons in a Nuclear Medium

Authors: E. Oset, L. S. Geng, D. Gamermann, M.J. Vicente Vacas, D. Strottman, K. P. Khemchandani, A. Martinez Torres, J. A. Oller, L. Roca, Mauro Napsuciale

Ref.: Int.J.Mod.Phys. E18, 1389-1403 (2009)

Abstract: In this talk I summarize recent findings around the description of axial vector mesons as dynamically generated states from the interaction of pseudoscalar mesons and vector mesons, dedicating some attention to the two $K_1(1270)$ states. Then I review the generation of open and hidden charm scalar and axial states, and how some recent experiment supports the existence of the new hidden charm scalar state predicted. I present recent results showing that the low lying $1/2^+$ baryon resonances for S=-1 can be obtained as 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 also dynamically 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 and BES, appears naturally as a resonance of the $phi K ar{K}$ system.

DOI: 10.1142/S0218301309013610