München 2006 – wissenschaftliches Programm

Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe

HK: Physik der Hadronen und Kerne

HK 55: Hauptvortr
äge

HK 55.3: Hauptvortrag

Freitag, 24. März 2006, 11:30–12:00, A

String breaking in QCD — •Gunnar Bali — Department of Physics and Astronomy, The University of Glasgow

The most striking feature of Young-Mills Theories is the confinement of fundamental colour sources (quarks). Even in QCD with sea quarks an effective confinement is still realized and isolated quarks cannot be observed. However, in this case quark-antiquark pairs can be created out of the vacuum. These non-perturbative features are not understood analytically, however, they have been verified by means of computer-simulations (Lattie QCD). In particular, in pure gauge theories a linearly confining potential between static quarks is established since over 20 years. The breaking of this confining string in QCD, due to quark pair creation, however, was not confirmed until last year. An introduction will be given into this problem which goes beyond the quark model. The dynamics of the string breaking mechanism will be studied in detail and the relationship to heavy quarkonium decay highlighted.