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The strong-interaction shift of kaonic 3He and 4He 2p states was measuredusing gaseous targets for the first time in the SIDDHARTA experiment. Thedetermined shift of kaonic 4He is much smaller than the values obtained in theexperiments performed in 70's and 80's. Thus, the problems in kaonic helium(the "kaonic helium puzzle") was definitely solved by our measurements. Thefirst observation of the kaonic 3He X-rays was also achieved. The shift both ofkaonic 3He and 4He was found to be as small as a few eV.

Kaonic 3He and 4He X-ray measurements in SIDDHARTA