Measurement of the Beam-Recoil Polarization in Low-Energy Virtual Compton Scattering from the Proton

L. Doria , P. Janssens , P. Achenbach , C. Ayerbe Gayoso , D. Baumann , I. Bensafa , M. Benali , J. Beri\v{c}i\v{c}

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J. C. Bernauer R. B\"ohm D. Bosnar L. Correa N. d'Hose X. Defa\"y M. Ding M. O. Distler H. Fonvieille J. Friedrich J. M. Friedrich G. Laveissi\`ere M. Makek J. Marroncle H. Merkel M. Mihovilovi\v{c} U. M\"uller L. Nungesser B. Pasquini J. Pochodzalla O. Postavaru M. Potokar D. Ryckbosch S. S\'anchez Majos B. S. Schlimme M. Seimetz S. \v{S}irca G. Tamas R. Van de Vyver L. Van Hoorebeke A. Van Overloop Th. Walcher M. Weinriefer

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classification ⚛️ nucl-ex hep-ex

keywords protoncomptondouble-polarizationfunctionlow-energyobservablesstructurevirtual

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Double-polarization observables in the reaction $\vec{e}p \rightarrow e'\vec{p'}\gamma{}$ have been measured at $Q^2=0.33 (GeV/c)^2$. The experiment was performed at the spectrometer setup of the A1 Collaboration using the 855 MeV polarized electron beam provided by the Mainz Microtron (MAMI) and a recoil proton polarimeter. From the double-polarization observables the structure function $P_{LT}^\perp$ is extracted for the first time, with the value $(-15.4 \pm 3.3 (stat.)^{+1.5}_{-2.4} (syst.)) GeV^{-2}$, using the low-energy theorem for Virtual Compton Sattering. This structure function provides a hitherto unmeasured linear combination of the generalized polarizabilities of the proton.

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Measurement of the Beam-Recoil Polarization in Low-Energy Virtual Compton Scattering from the Proton

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