New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities
- Beričič, J.
- Correa, L.
- Benali, M.
- Achenbach, P.
- Ayerbe Gayoso, C.
- Bernauer, J.C.
- Blomberg, A.
- Böhm, R.
- Bosnar, D.
- Debenjak, L.
- Denig, A.
- Distler, M.O.
- Downie, E.J.
- Esser, A.
- Fonvieille, H.
- Friščić, I.
- Kegel, S.
- Kohl, Y.
- Makek, M.
- Merkel, H.
- Middleton, D.G.
- Mihovilovič, M.
- Müller, U.
- Nungesser, L.
- Paolone, M.
- Pochodzalla, J.
- Majos, S. Sánchez
- Schlimme, B.S.
- Schoth, M.
- Schulz, F.
- Sfienti, C.
- Širca, S.
- Sparveris, N.
- Štajner, S.
- Thiel, M.
- Tyukin, A.
- Weber, A.
- Weinriefer, M.
DOIAbstract
International audienceVirtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer Q2: 0.10, 0.20, and 0.45 GeV2, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions PLL-PTT/ε and PLT, as well as the electric and magnetic generalized polarizabilities αE1(Q2) and βM1(Q2). These new results show a smooth and rapid falloff of αE1(Q2), in contrast to previous measurements at Q2=0.33 GeV2, and provide for the first time a precise mapping of βM1(Q2) in the low-Q2 region
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