SIDDHARTA CollaborationBazzi, M.Romero Vidal, AntonioZmeskal, J.2025-01-302025-01-302009-11-090370-2693https://hdl.handle.net/10347/39343The kaonic helium-4 3d → 2p X-ray transition was measured in a gaseous target, where Compton scattering in helium is negligible. The X-rays were detected with large-area Silicon Drift Detectors (SDDs) using the timing information of the K+K− pairs produced by φ decays at the DA NE e+e− collider. A new value of the strong interaction shift of the kaonic 4He 2p state was determined to be 0±6(stat)±2 (syst) eV, which confirms the recently obtained result by the KEK-PS E570 group.engCopyright © 2009 Elsevier B.V. Published by Elsevier B.V. All rights reserved.2207 Física atómica y nuclearjournal article10.1016/J.PHYSLETB.2009.10.052restricted access