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SUMMARY:A theoretician's view on the Theta+ pentaquark
DTSTART;VALUE=DATE-TIME:20050629T100000Z
DTEND;VALUE=DATE-TIME:20050629T110000Z
DTSTAMP;VALUE=DATE-TIME:20261113T061036Z
UID:indico-event-1443@indico.ific.uv.es
DESCRIPTION:The flavor properties of the instanton induced interaction in 
 quarks motivate a two-cluster model for \\Theta^+(uudd\\bar{s}): a diquark
  (ud) and a triquark (ud\\bar{s}) with an orbital motion characterized by 
 angular momentum L=1 between them. \\Theta^+ within this model has mass ar
 ound 1595MeV and positive parity.\nIn order to establish the validity of t
 he model we use the QCD sum rule method. We study initially the dynamics o
 f the clusters. We recover a scenario which closely resembles the model ca
 lculation.\nFinally\, we proceed to a full five particle sum rule calculat
 ion contaning the OPE and direct instanton contributions. We discover the 
 importance of higher dimensional operators in obtaining the correct parity
 \, mass and convergence in the calculation. Our result supports the existe
 nce of a pentaquark of positive parity at about 1700 MeV.\n\nhttps://indic
 o.ific.uv.es/event/1443/
LOCATION:Dpto. de Física Teórica (UVEG) Sala Seminarios
URL:https://indico.ific.uv.es/event/1443/
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