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- Title
Time-like nucleon form factor measurements at $$ \overline{\textbf{P}}\textbf{ANDA} $$.
- Authors
Sudoł, Małgorzata
- Abstract
The electromagnetic probe is an excellent tool to investigate the structure of the nucleon. The nearly 4 π detector PANDA, to be installed on the FAIR accelerator complex at Darmstadt, will allow to make a precise determination of the electromagnetic form factors of the proton in the time-like (TL) region with unprecedented precision. In the framework of the one-photon exchange, the center of mass unpolarized differential cross section of the reaction $\overline{p} p \rightarrow e^+ e^- $ is a linear combination of the squared moduli of the electric $G^{p}_E$ and magnetic $G^{p}_M$ proton form factors. The precise measurement of the angular distribution over almost full angular range then directly gives these quantities. Only two experiments have provided the ratio $R = {|G^{p}_E|/|G^{p}_M|}$ but with very large statistical uncertainties. Within PANDA, there is a unique opportunity to measure separately the moduli of these two proton form factors $G^{p}_E$ and $G^{p}_M$ in good conditions, up to around q2 = 14 GeV2 .
- Subjects
DARMSTADT (Germany); GERMANY; FORM factor (Nuclear physics); PARTICLES (Nuclear physics); ANGULAR distribution (Nuclear physics); NUCLEAR research
- Publication
Hyperfine Interactions, 2009, Vol 194, Issue 1-3, p241
- ISSN
0304-3843
- Publication type
Article
- DOI
10.1007/s10751-009-0081-y