Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2008-03-06
Eur.Phys.J.A37:1,2008
Physics
Nuclear Physics
Nuclear Experiment
9 pages, 10 figures. EPJA version. slight revisions in the text and figures
Scientific paper
10.1140/epja/i2008-10609-3
The cross section of the $ep \to e' p' \gamma$ reaction has been measured at $Q^2 = 0.33$ (GeV/c)$^2$. The experiment was performed using the electron beam of the MAMI accelerator and the standard detector setup of the A1 Collaboration. The cross section is analyzed using the low-energy theorem for virtual Compton scattering, yielding a new determination of the two structure functions $P_LL}-P_{TT}/epsilon$ and $P_{LT}$ which are linear combinations of the generalized polarizabilities of the proton. We find somewhat larger values than in the previous investigation at the same $Q^2$. This difference, however, is purely due to our more refined analysis of the data. The results tend to confirm the non-trivial $Q^2$-evolution of the generalized polarizabilities and call for more measurements in the low-$Q^2$ region ($\le$ 1 (GeV/c)$^2$).
Achenbach Patrick
Baumann Daniel
Bensafa I. K.
Bernauer Jan C.
Böhm Ralph
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