Abstract
In the exotic atoms where one atomic $1s$ electron is replaced by a $K^{-}$, the strong interaction between the $K^{-}$ and the nucleus introduces an energy shift and broadening of the low-lying kaonic atomic levels which are determined by only the electromagnetic interaction. By performing X-ray spectroscopy for Z=1,2 kaonic atoms, the SIDDHARTA experiment determined with high precision the shift and width for the $1s$ state of $K^{-}p$ and the $2p$ state of kaonic helium-3 and kaonic helium-4. These results provided unique information of the kaon-nucleus interaction in the low energy limit.
Highlights
Precision X-ray spectroscopy of the Z=1,2 kaonic atoms holds the key to understand the low-energy interaction between the kaon and the nucleus
In kaonic hydrogen which is the simplest kaonic atom, the strong interaction induced shift and width of the 1s state can be deduced from the K-series X-rays, and they are related to the s-wave K− p scattering length aK− p through the Deser-Trueman formula [1]
The main objective of the SIDDHARTA experiment is the precise measurement of the kaonic hydrogen K-series X-rays, most of the beam time was dedicated to the hydrogen target measurement to a total intergrated luminosity of 340 pb−1
Summary
Precision X-ray spectroscopy of the Z=1,2 kaonic atoms holds the key to understand the low-energy interaction between the kaon and the nucleus. In kaonic hydrogen which is the simplest kaonic atom, the strong interaction induced shift and width of the 1s state can be deduced from the K-series X-rays, and they are related to the s-wave K− p scattering length aK− p through the Deser-Trueman formula [1] This scattering length consists of two isospin dependent components of a0 (I=0) and a1 (I=1), which are among the most fundamental parameters for the low-energy K N interaction, and which can only be derived experimentally from X-ray spectroscopy. To disentangle these two components, precise measurement of the kaonic deuterium 1s shift and width is necessary, further taking into account higher order contributions from the three-body interaction [2]. The measurements we have performed in the SIDDHARTA experiment will be introduced in detail
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