Details

Autor(en) / Beteiligte

• Bazzi, M.
• Beer, G.
• Bombelli, L.
• Bragadireanu, A.M.
• Cargnelli, M.
• Corradi, G.
• Curceanu (Petrascu), C.
• dʼUffizi, A.
• Fiorini, C.
• Frizzi, T.
• Ghio, F.
• Girolami, B.
• Guaraldo, C.
• Hayano, R.S.
• Iliescu, M.
• Ishiwatari, T.
• Iwasaki, M.
• Kienle, P.
• Levi Sandri, P.
• Longoni, A.
• Lucherini, V.
• Marton, J.
• Okada, S.
• Pietreanu, D.
• Ponta, T.
• Rizzo, A.
• Romero Vidal, A.
• Scordo, A.
• Shi, H.
• Sirghi, D.L.
• Sirghi, F.
• Tatsuno, H.
• Tudorache, A.
• Tudorache, V.
• Vazquez Doce, O.
• Widmann, E.
• Zmeskal, J.

Titel

A new measurement of kaonic hydrogen X-rays

Ist Teil von

• Physics letters. B, 2011-10, Vol.704 (3), p.113-117

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2011

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• 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 1s 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.