New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities

J. Beričič; L. Correa; M. Benali; P. Achenbach; C. Ayerbe Gayoso; J. C. Bernauer; A. Blomberg; R. Böhm; D. Bosnar; L. Debenjak; A. Denig; M. O. Distler; E. J. Downie; A. Esser; H. Fonvieille; I. Friščić; S. Kegel; Y. Kohl; M. Makek; H. Merkel; D. G. Middleton; M. Mihovilovič; U. Müller; L. Nungesser; M. Paolone; J. Pochodzalla; S. Sánchez Majos; B. S. Schlimme; M. Schoth; F. Schulz; C. Sfienti; S. Širca; N. Sparveris; S. Štajner; M. Thiel; A. Tyukin; A. Weber; M. Weinriefer

doi:10.1103/physrevlett.123.192302

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arXiv · 1907.09954

New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities

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Abstract

Virtual Compton scattering on the proton has been investigated at three yet unexplored values of the four-momentum transfer $Q^2$: 0.10, 0.20 and 0.45 GeV$^2$, at the Mainz Microtron. Fits performed using either the low-energy theorem or dispersion relations allowed the extraction of the structure functions $P_{LL} -P_{TT} / \epsilon$ and $P_{LT}$, as well as the electric and magnetic generalized polarizabilities $\alpha_{E1}(Q^2)$ and $\beta_{M1}(Q^2)$. These new results show a smooth and rapid fall-off of $\alpha_{E1}(Q^2)$, in contrast to previous measurements at $Q^2$ = 0.33 GeV$^2$, and provide for the first time a precise mapping of $\beta_{M1}(Q^2)$ in the low-$Q^2$ region.

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J. Beričič, L. Correa, M. Benali, P. Achenbach, C. Ayerbe Gayoso, J. C. Bernauer, A. Blomberg, R. Böhm, D. Bosnar, L. Debenjak, A. Denig, M. O. Distler, E. J. Downie, A. Esser, H. Fonvieille, I. Friščić, S. Kegel, Y. Kohl, M. Makek, H. Merkel, D. G. Middleton, M. Mihovilovič, U. Müller, L. Nungesser, M. Paolone, J. Pochodzalla, S. Sánchez Majos, B. S. Schlimme, M. Schoth, F. Schulz, C. Sfienti, S. Širca, N. Sparveris, S. Štajner, M. Thiel, A. Tyukin, A. Weber, M. Weinriefer. 2019-07-23. New Insight in the $Q^2$-Dependence of Proton Generalized Polarizabilities. https://doi.org/10.1103/physrevlett.123.192302

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