Width of the ϕ meson in nuclear matter
| Autor: | A. Sibirtsev, S. Mikirtytchiants, A. A. Dzyuba, A. Yu. Polyanskiy, D. Chiladze, Yu. V. Valdau, H. Schade, V. Z. Serdyuk, I. Keshelashvili, E. Ya. Paryev, H. Ohm, P. Wüstner, S. Merzliakov, B. Kämpfer, B. Lorentz, H. Ströher, V. Hejny, H. J. Stein, S.V. Trusov, M. Hartmann, Ralf Gebel, Colin Wilkin, Markus Büscher, V. P. Koptev, V. Yu. Sinitsyna, M. Nekipelov, Yoshikazu Maeda, S. Dymov, Yu. T. Kiselev |
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| Rok vydání: | 2012 |
| Předmět: |
Physics
Nuclear and High Energy Physics Range (particle radiation) Angular range Meson Nuclear Theory Theoretical models Nuclear matter Atomic and Molecular Physics and Optics Nuclear physics Momentum Cross section (physics) High Energy Physics::Experiment Atomic physics Nuclear Experiment Nuclear density |
| Zdroj: | Physics of Atomic Nuclei. 75:63-75 |
| ISSN: | 1562-692X 1063-7788 |
| DOI: | 10.1134/s1063778811120088 |
| Popis: | The ratios of the cross sections for ϕ-meson production induced by 2.83-GeV protons on Cu, Ag, and Au nuclei to the respective cross section for C nuclei were measured at the ANKE-COSY facility in the momentum range of 0.6–1.6 GeV/c and the angular range of 0°–8°. The product ϕ mesons were identified by their decay ϕ → K+K−. The procedure used to separate kaon pairs was described in detail, and all sources of the background and their contribution to the resulting error in the values found for the above cross-section ratios were analyzed. The A dependence of the cross section for ϕ-meson production was shown to obey the A0.56±0.03 law. The total width of the ϕ meson at a normal nuclear density was extracted from a comparison of the measured cross-section ratios with the results of calculations based on two theoretical models. The resulting width value exceeds substantially both the vacuum width and the width expected in the absence of the nuclear-matter effect on the properties of the ϕ meson. |
| Databáze: | OpenAIRE |
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