g7a: Search for medium modification of light vector mesons off nuclei
- Spokespersons
- D. Weygand, C. Djalali, M. Kossov
- Year
- 2007
- Abstract
- Data were taken with a beam of tagged photons with energies up to 4 GeV on various nuclear targets. The properties of the ρ vector mesons were investigated via their rare leptonic decay to e+e−. This decay channel is preferred over hadronic modes in order to eliminate final state interactions in the nuclear matter. The combinatorial background in the mass spectrum was removed by a self-normalizing mixed-event technique. The ρ mass distributions were extracted for each of the targets.
- Publication
-
- R. Nasseripour, M. Wood, C. Djalali, D. Weygand, C. Tur, U. Mosel, P. Muehlich Search for Medium Modifications of the ρ Meson // Phys. Rev. Lett. 99, 262302 (2007)
- Quantities
- dY/dM(e+, e−) dY/dMρ(e+, e−)
Measurements
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ID | Quantity | Beam | Target | Final state |
Q2min, GeV2 |
Q2max, GeV2 |
Wmin, GeV |
Wmax, GeV |
---|---|---|---|---|---|---|---|---|
E103M1 | dY/dM(e+, e−) | γ | d | ρ + X | 0.0 | 0.0 | None | None |
E103M2 | dY/dM(e+, e−) | γ | 12C | ρ + X | 0.0 | 0.0 | None | None |
E103M3 | dY/dM(e+, e−) | γ | 56Fe | ρ + X | 0.0 | 0.0 | None | None |
E103M4 | dY/dMρ(e+, e−) | γ | d | ρ + X | 0.0 | 0.0 | None | None |
E103M5 | dY/dMρ(e+, e−) | γ | 12C | ρ + X | 0.0 | 0.0 | None | None |
E103M6 | dY/dMρ(e+, e−) | γ | 56Fe | ρ + X | 0.0 | 0.0 | None | None |
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