A search for the K-pp bound state (the lightest kaonic nucleus) has been performed using the γd→K+π-X reaction at Eγ = 1.5-2.4 GeV at LEPS/SPring-8. The differential cross section of the K+π- photo-production off deuterium (d2σ/dcosθlabK+/dcosθlabπ-) has been measured for the first time in this energy region. A peak structure was searched for in the inclusive missing mass spectrum. A statistically significant peak structure was not observed in the region from 2.22 to 2.36 GeV/c2. The upper limits of the differential cross section of the K-pp bound state production were determined to be (0.17-0.55), (0.55-1.7) and (1.1-2.9) μb at 95% confidence level with the assumed widths of 20 MeV, 60 MeV and 100 MeV.
|Number of pages||6|
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|Publication status||Published - 2014|
- Antikaon-nucleon physics
- Kaonic nuclei
ASJC Scopus subject areas
- Nuclear and High Energy Physics