Speaker
Michael Cargnelli
(Austrian Academy of Sciences - Stefan Meyer Institute)
Description
At the DAFNE electron-positron collider of Laboratori Nazionali
di Frascati we study kaonic atoms, taking advantage of the
low-energy kaons produced in the phi-meson decay. The
kaon-nucleon interaction at rest in kaonic hydrogen and kaonic
deuterium can be investigated under favorable conditions.
The DEAR (DAFNE Exotic Atom Research) experiment at LNF delivered
the most precise data on kaonic hydrogen up to now. DEAR and its
follow-up experiment SIDDHARTA
(Silicon Drift Detector for Hadronic Atom Research by Timing
Application) are using X-ray spectroscopy of kaonic atoms to
measure the strong interaction induced shift and width of the
ground state. From these quantities the isospin-dependent
antikaon-nucleon scattering lengths can be determined, quantities
useful to test the understanding of chiral symmetry breaking in
the strangeness sector. Within the SIDDHARTA project new X-ray
detectors are being developed. We will use an array of large area
silicon drift detectors (SDDs) having excellent energy resolution
but also providing timing capability which will result in a huge
suppression of background and so overcome the precision limits of
the former experiments. With this experimental technique the
measurement of kaonic deuterium X-rays will be feasible for the
first time.
Primary authors
Michael Cargnelli
(Austrian Academy of Sciences - Stefan Meyer Institute)
Siddharta Collaboration
