RT Journal Article
T1 Enhanced non-quark-antiquark and non-glueball N-c behavior of light scalar mesons
A1 Nebreda Manjón, Jenifer
A1 Peláez Sagredo, José Ramón
A1 Ríos, G.
AB We show that the latest and very precise dispersive data analyses require a large and very unnatural finetuning of the 1/N_c expansion at N_c = 3if the f_o(600) and K(800) light scalar mesons are to be considered predominantly q̅q  states, which is not needed for light vector mesons. For this, we use scattering observables whose 1/N_c corrections are suppressed further than one power of 1/N_c for q̅q  or glueball states, thus enhancing contributions of other nature. This is achieved without using unitarized ChPT, but if it is used we can also show that it is not just that the coefficients of the 1/N_c expansion are unnatural, but that the expansion itself does not even follow the expected 1/N_c scaling of a glueball or a q̅q  meson.
PB Amer Physical Soc
SN 1550-7998
YR 2011
FD 2011-10-04
LK https://hdl.handle.net/20.500.14352/44815
UL https://hdl.handle.net/20.500.14352/44815
LA eng
NO ©2011 American Physical Society.We thank J. Nieves and E. Ruiz-Arriola for useful discussions, checks and suggestions and B. Mussallam for the results of his Roy-Steiner dispersive analysis of the K(800) channel.
DS Docta Complutense
RD 7 abr 2025