A New Measurement of Kaonic Hydrogen X-rays

Collaboration
May, 2011
5 pages
Published in:
  • Phys.Lett.B 704 (2011) 113-117
  • Published: Oct 13, 2011
e-Print:

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Abstract: (Elsevier)
The K¯N system at threshold is a sensitive testing ground for low energy QCD, especially for the explicit chiral symmetry breaking. Therefore, we have measured the K -series X-rays of kaonic hydrogen atoms at the DAΦNE electron–positron collider of Laboratori Nazionali di Frascati, and have determined the most precise values of the strong-interaction energy-level shift and width of the 1 s atomic state. As X-ray detectors, we used large-area silicon drift detectors having excellent energy and timing resolution, which were developed especially for the SIDDHARTA experiment. The shift and width were determined to be ϵ1s=−283±36(stat)±6(syst) eV and Γ1s=541±89(stat)±22(syst) eV , respectively. The new values will provide vital constraints on the theoretical description of the low-energy K¯N interaction.
Note:
  • Long author list - awaiting processing
  • 32.30.Rj
  • 13.75.Jz
  • 36.10.-k
  • 29.40.Wk
  • Kaonic atoms
  • Low-energy QCD
  • Antikaon-nucleon physics
  • X-ray detection
  • Antikaon–nucleon physics
  • symmetry breaking: chiral