Speaker
Prof.
Eliahu Friedman
(Racah Inst. Physics, Hebrew University, Jerusalem, Israel)
Description
Six recent SU(3) chiral-model EFT approaches to the $\bar K$-nucleon
interaction are constrained by $K^-p$ low-energy scattering and
reaction data and by the kaonic hydrogen SIDDHARTA experiment.
However, the resulting $K^- N$ scattering amplitudes turn out to
be strongly model-dependent when extrapolating to energies below
threshold. The models studied predict widely different amplitudes
for neutrons also above threshold.
Strong-interaction observables in kaonic atoms depend on
$K^-$-nucleon interaction below threshold. Good agreement with the
world-data on kaonic atoms is achieved with the above models only
when $\bar K N$ amplitudes are supplemented by phenomenological
multi-nucleon terms.
Branching ratios for absorption-at-rest of $K^-$ mesons on nuclei,
from old bubble chamber experiments, are used as additional data
in the analysis of kaonic atoms. The results unequivocally
favor only two of the above six models, thus it is possible for
the first time to base on experiment the relative strengths of
state-of-the-art single-nucleon and multi-nucleon terms in the
$K^-$-nucleus potentials. The nuclear densities that are being
probed by these experiments are also well defined.
From potentials that fit both conventional data on kaonic atoms and
branching ratios of single-nucleon absorption-at-rest we are able to
make some general statements on low-energy $K^-$ interaction with
nuclei.
Primary author
Prof.
Eliahu Friedman
(Racah Inst. Physics, Hebrew University, Jerusalem, Israel)
Co-author
Prof.
Avraham Gal
(Racah Inst. Physics, Hebrew University, Jerusalem, Israel)
