Precision measurement of the $3d\to 2p$ x-ray energy in kaonic ${}^4$He

Abstract

We have measured the Balmer-series x-rays of kaonic ${}^4$He atoms using novel large-area silicon drift x-ray detectors in order to study the low-energy $\bar{K}$-nucleus strong interaction. The energy of the $3d\to 2p$ transition was determined to be 6467 $\pm$ 3 (stat) $\pm$ 2 (syst) eV. The resulting strong-interaction energy-level shift is in agreement with theoretical calculations, thus eliminating a long-standing discrepancy between theory and experiment.

12 pages, 4 figues, submitted to Physics Letters B

References in corpus (2)

• $\bar{K}$ nuclear bound states in a dynamical model
• X-ray energies of circular transitions and electrons screening in kaonic atoms

Cited by in corpus (12)

• Meson-nucleus potentials and the search for meson-nucleus bound states
• S-Wave Scattering of Fermion Revisited
• Measurements of the strong-interaction widths of the kaonic 3He and 4He 2p levels
• Hadron Physics at J-PARC
• Measurement of the strong interaction induced shift and width of the 1s state of kaonic deuterium at J-PARC
• A new kaonic helium measurement in gas by SIDDHARTINO at the DAΦNE collider
• The K1.8BR spectrometer system at J-PARC
• The SIDDHARTA-2 calibration method for high precision kaonic atoms X-ray spectroscopy measurements
• New opportunities for kaonic atoms measurements from CdZnTe detectors
• Measurements of high-n transitions in intermediate mass kaonic atoms by SIDDHARTA-2 at DA$\mathrm{\Phi }$NE
• First measurement of kaonic helium-4 M-series transitions
• Low-energy QCD and hadronic structure