[seminar] A. Krassnigg, The Bethe-Salpeter equation applied to meson studies in QCD

[Kresimir Kumericki]

Prirodoslovno-matematicki fakultet
FIZICKI ODSJEK 
Bijenicka c. 32, Zagreb, Hrvatska

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                     SEMINAR  TEORIJSKE  FIZIKE
(Zajednicki seminari Fizickog odsjeka PMF-a te Odjela za fiziku IRB-a)

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The Bethe-Salpeter equation applied to meson studies in QCD


dr. Andreas Krassnigg
Fizicki odsjek, PMF, Zagreb

Datum: 16. studenog 2007. (petak)
Vrijeme: 15 sati c.t.
Mjesto: PMF, Fizicki odsjek, Bijenicka c. 32, F-201


Sazetak:

Dyson-Schwinger equations provide a nonperturbative continuum approach
to quantum chromodynamics. Hadrons are studied in this framework of
infinitely many coupled integral equations with the help of a coherent
truncation scheme. In particular, the solution of the quark
Dyson-Schwinger equation and the Bethe-Salpeter equation for a
quark-antiquark system are used to describe mesons in a
Poincare-covariant way. Chiral symmetry and its dynamical breaking are
incorporated model-independently via the axial-vector Ward-Takahashi
identity at every step in the truncation scheme. This leads to exact
results like, e. g., a massless pion in the chiral limit. On the basis
of such a scheme, one can employ an Ansatz for the infrared (long-range)
behavior of the gluon propagator and quark-gluon vertex to both
elucidate the exact results obtained from identities as well as to
quantitatively study various aspects of the spectra and properties of
mesons. I will report recent progress and future challenges of this
approach.



2007-11-12 

Voditelj seminara:
dr. Kresimir Kumericki (kkumer at phy.hr)