HAL : in2p3-00261506, version 1
 arXiv : 0803.0911
 European Physical Journal A 37 (2008) 1-8
 A new measurement of the structure functions $P_{LL}-P_{TT}/epsilon$ and $P_{LT}$ in virtual Compton scattering at $Q^2=$ 0.33 (GeV/c)$^2$
 MAMI-A1 Collaboration(s)
 (2008)
 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)$^2$).
 Thème(s) : Physique/Physique Nucléaire ExpérimentalePhysique/Physique des Hautes Energies - Expérience
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0803.0911
 in2p3-00261506, version 1 http://hal.in2p3.fr/in2p3-00261506 oai:hal.in2p3.fr:in2p3-00261506 Contributeur : Jeanine Pellet <> Soumis le : Vendredi 7 Mars 2008, 11:47:39 Dernière modification le : Mercredi 19 Novembre 2008, 11:53:19