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New Insight in the Q2 Dependence of Proton Generalized Polarizabilities
Beričič, J Correa, L Benali, M Achenbach, P Ayerbe Gayoso, C Bernauer, JC Blomberg, A Böhm, R Bosnar, D Debenjak, L
Beričič, J
Correa, L
Benali, M
Achenbach, P
Ayerbe Gayoso, C
Bernauer, JC
Blomberg, A
Böhm, R
Bosnar, D
Debenjak, L
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Pre-print
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2019-11-07
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10.1103/PhysRevLett.123.192302
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© 2019 American Physical Society. Virtual 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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Physical Review Letters
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