PT Journal
AU Aceti, F
   Dai, LR
   Geng, LS
   Oset, E
   Zhang, Y
TI Meson-baryon components in the states of the baryon decuplet
SO European Physical Journal A
JI Eur. Phys. J. A
PY 2014
BP 57 - 11pp
VL 50
IS 3
DI 10.1140/epja/i2014-14057-2
LA English
AB We apply an extension of the Weinberg compositeness condition on partial waves of L = 1 and resonant states to determine the weight of the meson-baryon component in the Delta(1232) resonance and the other members of the baryon decuplet. We obtain an appreciable weight of pi N in the Delta(1232) wave function, of the order of 60%, which looks more natural when one recalls that experiments on deep inelastic and Drell Yan give a fraction of pi N component of 34% for the nucleon. We also show that, as we go to higher energies in the members of the decuplet, the weights of the meson-baryon component decrease and they already show a dominant part for a genuine, non-meson-baryon, component in the wave function. We write a section to interpret the meaning of the Weinberg sum rule when it is extended to complex energies and another one for the case of an energy-dependent potential.
ER