Kaonic helium-3 X-ray measurement in SIDDHARTA

Authors:
  • SCSIDDHARTA collaboration
    SIDDHARTA collaboration
  • ADA. D'Uffzi
    A. D'Uffzi

Abstract
The first observation of the kaonic 3He 3d - 2p transition was made using slow K- mesons stopped in a gaseous 3He target. The kaonic atom X-rays were detected with large-area silicon drift detectors using the timing information of the K+K- pairs of phi-meson decays produced by the DAFNE e+e- collider. The strong interaction shift of the kaonic 3He 2p state was determined to be -2+-2 (stat)+-4 (syst) eV, which is in agreement within the errors with theoretically estimated values.

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