6533b822fe1ef96bd127d618
RESEARCH PRODUCT
Electromagnetic Form Factors in the Time Like Domain
F.e. Maassubject
Elastic scatteringNuclear and High Energy PhysicsPair productionDomain (ring theory)CalculusElementary particleStatistical physicsFermionMeasure (mathematics)Atomic and Molecular Physics and OpticsLeptonMathematicsDimensionless quantitydescription
The electromagnetic form factors in the time like domain can be accessed by the reaction p ¯ p → e + e − or its time inversed process. Despite a long standing experimental effort to determine these form factors, the precision in the knowledge of the ratio | G E | / | G M | ist still very poor in the time like domain. All world data suffer from limited statistics and therefore have used the hypothesis of | G E | = | G M | in order to extract a value for | G M | . While there is no theory argument for this hypothesis, recent JLAB data from polarisation transfer in elastic electron scattering show, that this hypothesis does not hold. Only a few data points allow the determination of | G E | / | G M | with large uncertainties, the different experiments show considerable differences. The PANDA-experiment at the future GIS/FAIR accelerator complex will offer the possibility to measure the modulus of these form factors with unprecedented accuracy.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2008-09-01 | Nuclear Physics B - Proceedings Supplements |