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SUMMARY:Pseudoscalar- and vector-baryon coupled channel dynamics
DTSTART;VALUE=DATE-TIME:20111212T150000Z
DTEND;VALUE=DATE-TIME:20111212T160000Z
DTSTAMP;VALUE=DATE-TIME:20260613T194655Z
UID:indico-event-1831@indico.ific.uv.es
DESCRIPTION:Very recently\, we have studied vector meson-baryon (VB) syste
 ms with the motivation of finding dynamical generation of resonances. In o
 ur formalism\, the leading order contributions to the scattering equations
  have been obtained from a sum of diagrammes corresponding to a vector mes
 on exchange in the t-channel\, an octet baryon exchange in s-\, u-channels
  and a contact interaction originating from the hidden local symmetry Lagr
 angian. We find the contribution from all these sources\, except the s-cha
 nnel\, to be important. The amplitudes obtained by solving the coupled cha
 nnel Bethe Salpeter equations for the systems with total strangeness zero\
 , show generation of one isospin 3/2\, spin1/2 resonance and three isospin
  1/2 resonances: two with spin 3/2 and one with spin 1/2. We identify thes
 e resonances with Delta (1900) S31\, N*(2080) D13\, N*(1700) D13\, and N*(
 2090) S11\, respectively. We have further extended our study by including 
 pseudoscalar meson-baryon (PB) systems to VB as coupled channels. To do th
 is\, we obtain the PB -> PB and VB -> VB amplitudes from the t-channel dia
 grams and the PB -> VB amplitudes are calculated using the Kroll-Rudderman
 n term where\, considering the vector meson dominance phenomena\, the phot
 on is replaced by a vector meson. The calculations done within this formal
 ism reveal a very strong coupling of the VB channels to the low-lying reso
 nances like Lambda(1405) and Lambda(1670). The strong coupling of these lo
 w-lying resonances to the VB channels can have important implications on c
 ertain reactions producing them. In addition to this\, we find that the ef
 fect of coupling the higher mass states to lighter\, open channels is not 
 restricted to increasing the width of those states\, it can be far more st
 rong.\n\nhttps://indico.ific.uv.es/event/1831/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1831/
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