We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
PARTIAL DECAY WIDTHS OF THE ϕ INTO e<sup>+</sup>e<sup>−</sup> AND K<sup>+</sup>K<sup>−</sup> PAIRS IN 12 GeV p + A REACTIONS AT KEK-PS E325.
- Authors
SAKUMA, F.; CHIBA, J.; EN'YO, H.; FUKAO, Y.; FUNAHASHI, H.; HAMAGAKI, H.; IEIRI, M.; ISHINO, M.; KANDA, H.; KITAGUCHI, M.; MIHARA, S.; MIWA, K.; MIYASHITA, T.; MURAKAMI, T.; MUTO, R.; NAKURA, T.; NARUKI, M.; OZAWA, K.; SASAKI, O.; SEKIMOTO, M.
- Abstract
The experiment KEK-PS E325 measured e+e− and K+K− pairs produced in 12 GeV p + A reactions, in order to search for in-medium modification of vector mesons. In the e+e− spectra, a significant excess on the low-mass side of the ϕ-meson peak is observed in the very low βγ (= p/m) region of the copper target data. On the other hand when the velocity of ϕ mesons is higher or a smaller target, carbon, is employed, the observed ϕ-meson shapes are consistent with the expected shape in vacuum, both in the e+e− and K+K− spectra. We have also compared the nuclear mass number dependence of ϕ-meson production between the e+e− and K+K− decay channels. Using these results, the first experimental limits are obtained for in-medium broadening of the partial decay widths.
- Subjects
VECTOR mesons; CARBON; ATOMIC mass; HADRON interactions; MASS spectrometry; MONTE Carlo method
- Publication
Modern Physics Letters A, 2008, Vol 23, Issue 27-30, p2401
- ISSN
0217-7323
- Publication type
Article
- DOI
10.1142/S0217732308029472