[Jlab-seminars] Theory Center Seminar

[Mary Fox]

Theory Center Seminar
Monday, June 22, 2015
1:00 p.m. (coffee at 12:45 p.m.)
CEBAF Center, Room L102


Cintia Willemyns (JSA/HUGS International Fellow)
University of Buenos Aires

*New **M**ass Relations for L=1 Excited Baryons **
*
It will be shown how the non-relativistic quark model, with both flavor 
dependent
and flavor independent effective quark-quark interactions, matches to 
the $1/N_c$
quark operator basis. Analytic expressions in terms of radial integrals 
are obtained
for the $1/N_c$ operator coefficients. Several new, parameter free 
relations between
the masses and the two mixing angles of the negative parity $L=1$ 
excited baryons
will be presented. They can discriminate between quark-quark 
interactions with
different spin-flavor structures. Within the present experimental 
uncertainties,
consistency with the best values of the mixing angles, as determined by 
a recent
global fit to masses and decays, does not exclude any of the two most 
extreme
possibilities of flavor dependent (independent) quark-quark 
interactions, as
generated by pion (gluon) exchange models.
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