SEMINAR
Tuesday,
November 7 ^{th}, 2006
h. 15.00
Room Building 22  Nuclear Physics
Bugra Borasoy, Bonn University  Germany
Lowenergy antikaon nucleon interactions
The lowenergy antikaon nucleon system is of special interest as
a testing ground for chiral SU(3) symmetry in QCD. The existence
of the Lambda(1405) resonance just 25 MeV below the K^{}p
threshold, however, makes chiral perturbation theory inapplicable in
this channel.
Nonperturbative coupledchannel techniques based
on driving terms of the chiral SU(3) effective Lagrangian have proved
useful and successful in dealing with this problem. Taking K^{}p
scattering data as input we provide an error range for the strong K^{}p scattering length which is related to the strong interaction shift
and width in kaonic hydrogen. The derived strong interaction shift
and width is in agreement with the KEK experiment, but is in clear
disagreement with the one deduced from the DEAR experiment.
Our investigations are also of considerable interest in the
discussion of possible deeply bound K^{} nuclear states.
