Width of the {phi} meson in nuclear matter

Journal Article · Sun Jan 15 04:00:00 EST 2012 · Physics of Atomic Nuclei

DOI:https://doi.org/10.1134/S1063778811120088· OSTI ID:22043801

Polyanskiy, A Yu ^[1]; Hartmann, M ^[2]; Paryev, E Ya ^[3]; Buescher, M; Chiladze, D ^[2]; Dymov, S N ^[4]; Dzyuba, A A ^[5]; Gebel, R; Hejny, V ^[2]; Kaempfer, B ^[6]; Keshelashvili, I ^[7]; Koptev, V P ^[5]; Lorentz, B ^[2]; Maeda, Y ^[8]; Merzliakov, S I ^[2]; others, and

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1. Institute of Theoretical and Experimental Physics (Russian Federation)
2. Institut fuer Kernphysik and Juelich Centrum fuer Hadron Physics (Germany)
3. Russian Academy of Sciences, Institute for Nuclear Research (Russian Federation)
4. Universitaet Erlangen-Nuernberg, Physikalisches Institut II (Germany)
5. Russian Academy of Sciences, Department of High-Energy Physics, Petersburg Nuclear Physics Institute (Russian Federation)
6. Forschungszentrum Dresden Rossendorf (Germany)
7. University of Basel, Department of Physics (Switzerland)
8. Osaka University, Research Center for Nuclear Physics (Japan)

The ratios of the cross sections for {phi}-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 Degree-Sign -8 Degree-Sign . The product {phi} mesons were identified by their decay {phi} {yields} K{sup +}K{sup -}. 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 {phi}-meson production was shown to obey the A{sup 0.56{+-}0.03} law. The total width of the {phi} 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 {phi} meson.

• OSTI ID: 22043801
• Journal Information: Physics of Atomic Nuclei, Journal Name: Physics of Atomic Nuclei Journal Issue: 1 Vol. 75; ISSN 1063-7788; ISSN PANUEO
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COMPARATIVE EVALUATIONS
COPPER 63 TARGET
COSY STORAGE RING
CROSS SECTIONS
GEV RANGE
GOLD 197 TARGET
KAONS MINUS
KAONS PLUS
NUCLEAR MATTER
PARTICLE PRODUCTION
PARTICLE WIDTHS
PHI MESONS
PROTON REACTIONS
PROTONS