Kaonic deuterium and low-energy antikaon-nucleon interaction
Abstract
A new evaluation of the 1s level shift and width of kaonic deuterium is presented based on an accurate KNN three-body calculation, using as input a realistic antikaon-nucleon interaction constrained by the SIDDHARTA kaonic hydrogen data. The three-body Schr\"odinger equation is solved with a superposition of a large number of correlated Gaussian basis functions extending over distance scales up to several hundred fm. The resulting energy shift and width of the kaonic deuterium 1s level are E 0.67 keV and 1.02 keV, with estimated uncertainties at the 10% level.
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