BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//CERN//INDICO//EN
BEGIN:VEVENT
SUMMARY:Radiative decays of quarkonium states\, momentum operator expansio
 n and nilpotent operators
DTSTART;VALUE=DATE-TIME:20051103T110000Z
DTEND;VALUE=DATE-TIME:20051103T120000Z
DTSTAMP;VALUE=DATE-TIME:20261113T050028Z
UID:indico-event-1452@indico.ific.uv.es
DESCRIPTION:We present the method of calculation of radiative decays of co
 mposite quark-antiquark systems with different J^{PC}: (Qbar Q)_{in} -> ga
 mma (Qbar Q)_{out}. The method is relativistic invariant\, it is based on 
 the double dispersion relation integrals over the masses of composite meso
 ns\, it can be used for the high spin particles and provides us with the g
 auge invariant transition amplitudes. We apply this method to the case whe
 n the photon is emitted by a constituent in the intermediate state (additi
 ve quark model). We perform the momentum operator expansion of the spin am
 plitudes for the decay processes. The problem of nilpotent spin operators 
 will be also discussed.\n\nhttps://indico.ific.uv.es/event/1452/
LOCATION:Edf. Institutos de Investigación Sala Seminarios IFIC
URL:https://indico.ific.uv.es/event/1452/
END:VEVENT
END:VCALENDAR